ELECTRONIC TECHNICIAN...ELECTRONIC TECHNICIAN WORLD'S LARGEST ELECTRONIC TRADE CIRCULATION AUGUST...

ELECTRONICTECHNICIANWORLD'S LARGEST ELECTRONIC TRADE CIRCULATION

AUGUST 1965

I -1111-1

I I IW VmW

rittki rislrithai%gopsyllenswars:44AIIIILIAMML41.111_ A

VHF/UHF/FM ANTENNASAN.

A MUSTFOR

LOR TV

NEWJERROLD COLORAXIAL

Antenna SystemThe old familiar twinlead, that workedpretty well for black -and -white TV, ishopelessly inadequate for color reception.When your customers complain aboutchanges in color, ghosting, and smearingof pictures, chances are the fault liessquarely with the twinlead connecting theset to the antenna.

What's the answer? Jerrold announcesthe exciting Coloraxial TV ReceptionSystem-an absolute necessity for color,and also best for black -and -white and FMstereo. With Coloraxial, you can quicklyconvert any outdoor antenna to shieldedcoax operation. Installs anywhere inminutes, without need for standoff insu-lators or the fear of running near metalobjects.

HURDELECTRON CS

Your customerswill welcome thepredictable, perfectreception that'sassured with aColoraxial system.

A subsidiary of The Jerrold Corporation And you'll welcome

the simplicity and profitability of a Color-axial installation. Jerrold Coloraxial Kitsgive you everything you need for a quick,perfect job: 50 or 75 feet of sweep -tested,shielded RG-59/U cable with fittingsalready on; matching transformers forboth ends of the cable-even Coloraxial(75 -ohm) antennas and preamplifierswhere the job calls for them.

Talk with your Jerrold distributor todayabout Coloraxial, or send coupon for com-plete information.

r -

Jerrold Electronics CorporationDistributor Sales Division15th & Lehigh Ave., Philadelphia, Pa. 19132

Send me complete information on the new JerroldColoraxial TV Reception System.

Name

Company

Address

City State Zip

... for more details circle 28 on postcard

The newAmphenol 860Color Commandercuts alignment timein half!

Ever finish a convergence jobto find the raster off center.Lose convergence when you re -centered? Can't happen with theAmphenol Color Commander, bat-tery -powered, solid-state color gen-erator. A special, single -crossbar patternconsists of one horizontal and one vertical line,crossing just where the center of the rastershould be. No need to guess when centering theraster with this new pattern.See dots before your eyes when you want onlyone to start static convergence? The 860 givesyou that single dot, right at center screen. You'llbe switching back to this important dot duringdynamic adjustment to make sure you haven'tgone off the track.Even the old patterns offer something new.Line spacing in the cross -hatch pattern is rigidlymaintained for the 4:3 aspect ratio. You canrely on it for linearity, height, and width adjust-ments. The pattern gives you finely etched linewidth at normal brightness levels. What goodis perfect convergence at reduced brightness ifyou lose it when the set's readjusted for normalviewing? This special crosshatch also eliminatesreceiver fine-tuning error. Among the 860'snine (most generators have only 5 or 6) are:multiple -dot, single vertical line, single hori-zontal line, vertical lines only, and horizontallines only.Finally, the Color Commander's unique colorbar pattern (just three bars: R-Y, B-Y and-R-Y)simplify color adjustments. You can geta rapid, overall check of color circuits. Thenadjust color demodulator phase or pre-set thehue control and check its operating range. Ineach step, you know precisely how the colorbars should look and how they should changeduring adjustment.

A new timingcircuit elimin-ates instabilityand loss -of -syncproblems. Silicon tran-sistors maintain built-in precision and stabilityindefinitely. RF output is on channel 3 or 4,switch selected. An attenuator simulates weak -signal conditions. It has gun killer circuit. Uses9 penlight cells. Weighs 31/2 lbs. in compactleatherette carrying case. $149.95. Optional ACpower supply, $19.95.AM PHENOL CRT COMMANDER, MODEL 855.Solid-state. Checks all black -and -white or colorCRT's with the same techniques used by tubemanufacturers. Rejuvenates where others fail.Versatile 5 -socket cable accommodates 7 dif-ferent sockets. With CRT chart, $89.95.See the new Color Commander test instrumentsat your Amphenol distributor.

DISTRIBUTOR DIVISIONamphenol corroratior

2875 S. 25th Ave., Broacview, III.60155

AUGUST 1965


19

Next time youneed one,get it fast.Mail thiscoupon.

. YES, Philco, I want faster, complete parts service! Tell the nearest 1111 Philco Parts Distributor to send me information about special

Philco Parts offers, prices and facts. And tell him to hurry!

Name

Address

City Zone

State

Mail to: Philco Parts & Service DepartmentP. 0. Box No. 3635Philadelphia, Pennsylvania 19125

lb NE NE us

Cathode ray tubes, receiving tubes andgenuine Philco parts - your Philco Parts

Distributor has them. In one quick stopyou can also get universal replacements for

nearly every TV and radio ever made, atremendous range of national brand componentsand many profit -making accessories and extras.

The rare time a Philco part isn't in stock,Philco's Lifeline Emergency Service jumps into

action. Your order is instantly transmitted toPhilco's national parts depot in Bedford,

Indiana - and the part you need is on its wayto you, by air, in 24 hours or less.

Extra services from your Philco PartsDistributor include valuable knowhow and data

on just about every TV, radio or phono evermade. When you're stuck on something, he's the

man who can help you.If you're not getting this kind of fast, one -stop

parts service, you should. Mail the coupon andstart doing business with your Philco Distributor.

PH I LCOA SUBSIOtAAY OF 4.../Igil6VerK7nOancy,

... for more details circle 35 on postcard20 ELECTRONIC TECHNICIAN

-1(

AUGUST 1965

VOL. 82 NO. 2

RON KIPP

JACK HOBBS

QUINTO BOCCHI

DOUGLAS HEDIN

JOHN BAILEY

THOMAS MURN

MARY CONNORS

MAGGIE KANE

JIM GHERNA

RUTH GELINEAU

Publisher

Managing Editor

Technical Editor

Industrial Editor

Assistant Editor

Assistant Editor

Editorial Production

Advertising Production

Art Director

Circulation Fulfillment

AN OJIBWAYPUBLICATION

OJIBWAY PRESS, Inc.

Ojibway Building, Duluth, Minn. 55802

AREA CODE 218 727-8511

ADMINISTRATION:MARSHALL REINIG PresidentROBERT EDGELL Executive Vice PresidentDEAN MYHRAN Vice PresidentGREGORY BLODGETT TreasurerBEN MARSH Editorial DirectorHARRY RAMALEY Production DirectorJOE WOLKING Circulation DirectorANGUS STONE Marketing Manager

Sales Offices:

NEW YORK: Ron Kipp, 25 W. 45 St.New York, N.Y. 10036AREA CODE 212 581-4200

CHICAGO: Jack Daniels, 221 N. LaSalleSt., Chicago, III. 60601AREA CODE 312 CE 6-1600

Copyright 1965 by Ojibway Press, Inc.,Duluth, Minn. 55802. Reproduction and re-printing prohibited except by written author-ization of the publication. Subscription price:55 for 1 year, $8 for 2 years, $10 for 3 years.Foreign, $9 for 1 year, $14 for 2 years, andS18 for 3 years.If you have a change of address or a ques-tion about your subscription, write: ELEC-TRONIC TECHNICIAN, Circulation Department,Ojibway Building, Duluth, Minnesota 55802.BE SURE TO SEND ALONG THE ADDRESSLABEL FROM YOUR MOST RECENT ISSUE.

AUGUST 1965

Advertisers Index

ELECTRONICTECHNICIAN

WORLD'S LARGEST ELECTRONIC TRADE CIRCULATION

CoverOur cover shows three basic antenna types and their approximate polar patterns-the cornerreflector, the broad -banded yagi and the log-periocic-which symbolizes this month's emphasis

on antennas, accessories and installation problems.

FEATURESOne Man Can Erect Fringe Area Anter nas 41

Dennis Crisp, a one-man antenna installation specialist, shares his valuable experiencesin a two-part article series

There's Money in Master Antenna Systems 44Lon Cantor reviews installation and merchandising techniques in this profitable area

How Multipath Signals Affect FM Reception 48Bob Brickey reminds us of a major problem to be solved if we are to give our FM/Stereo

customers satisfactory reception

Color Bar/Dot Generators 51

A new feature that corers one instrument each month

Color, Color Everywhere-But Not a Bit in Sync 54Joe Hayes concludes another 'Bob' and 'Scoot' in -shop story that's full of practicalcolor information

Combination VOM/VTVMs 57

A review of two different combination test instruments

FM/Stereo Servicing Principles 58Tom Haskett tells what every technician needs to know about servicing this equipment

Soldering Tips for Today 61

Technician Conrad Larson gives us the latest on this subject

DEPARTMENTSLetters to the Editor 22 Colorfax 64

Editor's Memo 26 Tc ugh Dogs 66

Sync on Business 29 N aw Products 68

Technical Digest 34 N>sys of the Industry 82

TEKFAX

88

ADMIRAL: TV Chassis G4, 2G4, 8G4, 9G4

AIRLINE: TV Model Gen -1266A

CORONADO: TV Model TV2-9398A

EMERSON: TV Chassis 120779, 780, 781,782, 783, 784, 785

MUNTZ: TV Chassis Run Number 768H28

RCA VICTOR: TV Chassis KCS 154A, B

7RUETONE: TV Chassis Model 2DC3651

ZENITH: TV Chassis 14M21

21

"What our businessneeds is a good UHFVHF amplifier':"Whatour business needs isa good UHF -VHF amplifierrWhat our bu.::

"Say no more."

"You mean there's an amplifier that covers allTV channels from 2 to 83?""You bet. In fact the-re are two-the outdoor U/Vamp-2and the indoor V/U-ALL2.""Suppose I live in an area where there's only VHF?''"Your motto should be 'Be Prepared' because thereare a lot of new UHF stations soon to come on the air.These all -channel amplifiers are obsolescence -proof.""Anything I should know about the U/Vamp-2?""Well, the U/Vamp-2 is compact and easy to installon the antenna mast. Has a remote AC power supply.""How about performance?""Two transistors give you all the power you needfor better reception on VHF and UHF. Also protectagainst overload. Lists for $49.95.""Supposing I don't want to put an amplifierup on my antenna mast?""Then use the V/U-ALL2. Not as effective as theU/Vamp-2, but you don't have to climb a ladder . . .

and it delivers signals to two TV sets. Only $42.50 list.""Guess I'll rush down and get one of the newBlonder -Tongue UHF/VHF amplifiers."

(This message was paid for out of the gross profits ofBLONDER -TONGUE, 9 Ailing St., Newark 2, N.J.)


LETTERSTO THE EDITOR

Persian ObservationsI am an Iranian (Persian) and one

of only a few technically qualifiedtechnicians in Tehran.

I wonder if any of your readerswould be willing to send some of theirschematics to me for no return, un-less they might be interested in Per-sian stamps. In this part of the worldradios, TV sets and other electronicequipment are sold without sche-matics . . .

In your February 1965 issue (page68) under "Tough Dog Corner,"Walter Anderson's intermittent troublerequires some explanation:

In the first place, what are suchhuge capacitors (220 µ1 and 470 µf)doing bypassing screens and plates inan IF circuit?

Assuming that the intermittent Mr.Anderson discovered was shorting ofthese capacitors (of course, they werenot intermittently open because openbypassers would not kill the entirevideo), and also assuming he did usea voltmeter prior to suspecting thesehuge bypassers, did he not find theplates and the screens of both stagesat ground potential? If he did, whatis so tough about this trouble? If hedid not, how did he arrive at his con-clusions?

Each time either or both guiltycapacitors shorted out, it must havelasted some time or the owner wouldnot have bothered to bring the set in.Again assuming that the longest timethat one of these capacitors shortedout was one minute, in this one minutewhat would have happened to the 2202 resistor in series with the plate andscreen of the 2nd IF? Could a half-watter stand more than a whole ampof current that long?

I personally have had more troublewith these bypassers than any othercircuit component. But Mr. Ander-son's trouble seems a little unusual,especially with the values of the by-pass capacitors.

VLADIMIR D. BET-EIVAZIC/O USIS, American Embassy

Tehran, Iran

All capacitor values shown in theschematic were not correctly indicated.Value indicators, of course, shouldhave been pf instead of pf.-Ed.

Needs Jackson SchematicI need a schematic and operating

instructions for a Jackson Model 634dynamic tube tester, serial No. 6415.

22ELECTRONIC TECHNICIAN

Have you tried new QUIG connectors?

Not just anotherwire spring connector!

The 3 -in -1 QUIG is brand new and different ... Cop-

perweldwire inner core, a layer of flux,

and an

outer jacket of solder . . .all you need is heat!

solderingpossible!

Makes one -handed

Once again, Sprague helps the TV -radio service indus-try by solving two increasingly serious problems . . .

parts replacement in those "inaccessible" chassis nooks,such as crowded tube sockets, as well as soldering ontothe delicate circuitry of printed wiring boards.

Mechanically sturdy and electrically reliable, therevolutionary QUIG provides fast, expertly-solderedconnections as easy as A -B -C!

OSnip

Lead 0 Slip on

QUIG

1

-41

Ten timesactual size

Heat QUIG,O Connection Made!

IIOSODY ELSE HAS 001C CONNECTORS...

YOU GET 'EM MY FROM SPRAGUE PRODUCTS!QUIGS are now being packed with Sprague Atom® Capacitors at no extra cost to

you! Whenever you need tubular electrolytics, insist on pre-packaged Sprague Atoms

from your parts distributor and you'll automaticallyget your QUIG component connectors . . . the biggestboon to the service technician since the soldering gun!

SPRAGUE®THE MARK OF RELIABILITY

WORLD'S LARGEST MANUFACTURER OF CAPACITORS184161

AUGUST 1965


23

NEW HOT -VAC DE -SOLDERING TOOL

... reduces your PC repair and rework time by half ... provedfaster in actual use.

One hand, one operation. HOT -VAC melts and removes solderin one operation, other hand is free to lift components.

Ungarized coating on tip and other metal components preventssolder from sticking and clogging.

HOT -VAC features the NEW #777 Clean Room Handle. It's heatstabilized, non -slip, poly grip, won't dust or deteriorate.

Get the full story from your local authorized Ungar distributor orsend this coupon.

PAT. PENDING

UNGAR ELECTRIC TOOLS, Hawthorne, California 90252 Dept.

Name TitleSend full

informationon HOT -VAC

Company

Address

City & State __Zip Code -

ET I

I

LETTERSTO THE EDITOR

They're out of print at Jackson's I'minformed. Could also use latest tubedata charts.

GALBRAITHCleburn, Texas

Accurate VTVMIn June ET John Lind inquired

about an Accurate VTVM, No. 152.This instrument was manufactured byAccurate Instrument Co., Inc. 911Faile St., New York 59, N.Y. Keep upthe good work. I've been in the busi-ness about 12 years and haven't founda magazine that equals ET.

DELBERT MAYBERRYWyoming, Iowa

Room for ImprovementI have been a steady subscriber to

your excellent magazine for manyyears and enjoy reading all the manyuseful articles . . . But there's alwaysroom for improvement. I refer toTEKFAX diagrams which to me arethe main features for those who canmake good use of them like myselffor one. I realize that you have toboil down to save space. You have touse a magnifying glass to read someof the data anyway, so why not shrinkthem a little more and add the tunerinformation?

JOHN YENNETTIPittsburgh, Pa.

Note step by step improvements inTEKFAX material during past year.You will see additional improvementsshortly.-Ed.

TEKFAX and ET CopiesI need schematics book 103. Can

anyone help me?C. H. RAGLAND

Atlanta, Ga.

. . . Can any reader furnish me withTEKFAx numbers 1 to 326? Also sche-matics volumes 101 and 102.

THOMAS KELLEYWoonsocket, R.I.

I have 55 copies of ET dating fromApril 1960 (Circuit Digests not in-cluded). 122 Circuit Digests andTEKFAX numbers 31 through 152.Volume 100 and 103 schematics. Any-one interested?

W. H. BRITAINDallas, Tex.

24... for more details circle 47 on postcard

ELECTRONIC TECHNICIAN

RCA Solid CopperCircuits

replace olifashioned

"hand wiring:. CA Solid

Copper Circuits are the

circuits of the space age

RCA Solid Copper Circuits are made by meth-ods as modern as tomorrow. They give greaterdependability . . . better TV performance. It'stypical of the advanced design you'll findthroughout every RCA Victor home instrument.It all adds up to sets that are easier to serviceso that owners are more satisfied with results.

The Most Trusted Name

in Electronics

More TV servicemen own RCA Victor Color TV than all other leading makes combined

AUGUST 196525

COMPLETE TUNER

OVERHAUL

ALL MAKES - ONE PRICE

COLOR

TRANSISTOR

Guaranteed Color Alignment-No Addit. Charge

Simply send us the defective tuner complete, includetubes, shield cover and any damaged parts with modelnumber and complaint. Your tuner will be expertlyoverhauled and returned promptly, performance re-stored. aligned to original standards and warrantedfor 90 days.

UV combination tuner must be single Ch3SSIS type,dismantle tandem UHF and VHF tuners and send Inthe defective unit only.

Exact Replacements are available for tuners unfit forOverhaul. As low as $12.95 exchange. (Replacementsare new or rebuilt.)

CASTLETV TUNER SERVICE, INC.MAIN PLANT: 57 13 N. Western Are., Chicago 45, Illinois

EAST: 41-92 Vernon Blvd , long Island City 1, NCANADA 136 Main Street, Toronto 13. Ontario

'Major Parts are additional in Canada

for more details circle 19 on postcard

EDITORS' MEMO

Another Facet of DIY

Service -dealers and technicianshave complained for years aboutnewspapers and mass -reader maga-zines "fogging -up" their status in thepublic eye. But, with few exceptions,little or nothing has been done byservice -dealers and technicians as agroup to change this situation exceptthrough "legislative" nostrums.

We are reminded of a few old"idea -provokers" that haven't beenobsoleted by space-age progress. Theyinclude "Charity begins at home,"and "If you want the job done right,do it yourself."

And that brings us to an interestingspeech which Vincent T. Wasilewski,president of the National Associationof Broadcasters (NAB), made lastspring. Said Wasilewski, "We believethat a society in which there is free-dom of expression, freedom of belief,and freedom of competition is a su-preme achievement. . . . But, "Thefreedoms we prize so highly them-selves generate pressures tending tolimit those freedoms . . . Competitionwhich is truly free and unrestrictedpermits, on the one hand, the growthof enormous combines which becomeso powerful as to endanger the free-dom of all of us . . . On the otherhand, free competition can result inan excess of competitive zeal which inits lowest form deteriorates into de-ception and fraud."

Then he went on to say that wher-ever these "unfortunate side effects"occur, "there is a strong outcry forcontrol. The public is offended; itseeks a remedy and the handiestremedy is legislative restrictions im-posed by government."

For this reason, he said, there isonly one position that American busi-nessmen can take if they truly wishto remain free of further government-al control.

"We will accept not only the re-sponsibility of our own individual ac-tions, but also for the actions of ourassociates . . .

"If we do not, we abdicate the re-sponsibility to the government."

And there you have it-in plain,simple language. If you won't cleanup your own back -yard through self-regulative, joint effort; if you can'tdo it yourself, then you'll get licensing-which is no guarantee that yourstatus will "automatically" improve inthe public eye. If you want guaran-teed results-DIY!

brand new...and very important...

QUAM COLOR TV

REPLACEMENT

SPEAKERS PREVENT

COLOR PICTURE

DISTORTIONOFTEN CAUSED BY STRAYMAGNETIC FIELDS FROM

ORDINARY LOUDSPEAKERS

When you use an ordinary loudspeaker in acolor TV set, you're looking for trouble . . .picture trouble. The external magnetic fieldsfrom standard loudspeakers will deflect theprimary color beams, causing poor registra-tion and distorted pictures.

lam.

M

QUAM RESEARCH SOLVESTHIS PROBLEM An entirelynew construction technique, developed inthe Quam laboratories, encases the magnetin steel, eliminating the possibility of straymagnetic fields and the problems theycause! These new Quam speakers have beeneagerly adopted by leading color TV setmanufacturers. Quam now takes pride inmaking them available for your replace-ment use. Five sizes (3' x 5', 4', 4' x 6',8W, 8') . . . in stock at your distributor.

QUAM-NICHOLS COMPANY234 E. Marquette Rd. Chicago, III. 60637

. . . for more details circle 37 on postcard26


A11.1111.71ntroducingShannel Master's new

Color Crossfire SeriesNIIIIhLt does for color (and black -and -white) what

no other antenna can. FM Stereo, too!

Model 3610G Color Crossfiroutperforms 28 Element

Model 3600G

Up to 38*. more TV gain ...up to 100 more FM gain ...

than the Crossfire ...

plus up to 16:1Front -To -Back ratio

h band

...plus the "cats whisk-ers ' the heart of theTri-Bad Director Sys-tem). .that further in-crease broad -bandefficiency.

Also Available...75 ohm BalunModel 0135 which fits direct-ly on terminals of all ColorCrossfire models.

Model36116

Now ...he year of the big color boom. . . is the time to have a fresh look atcolor. Channel Master has done exactlythat, and nore. From the metropolitanarea on ou- to the deep fringes, we'vetaken a new look at the whole TV picture-black -and white included.

As a resilt, we've come up with theColor Cross'ires-far and away the mostpowerful ar tennas in the world. (Yes,even more Dowerful than our Crossfireswere).

Name an area. We'll show you a ColorCrossfire that does more things betterwithir that area-than they've ever beendone before by any antenna. But wherethe C:olor 3rossfire really shines is incolor; it's especially engineered to beatthe extra -tough problems typical of colorreception.

No color suckouts! No dips. Perfectimpecance match. Ghosts and interfer-ence-they've "murder" in color-areknocked ou-.. (If you also sell color sets-this antenna keeps 'em sold). And newtapered lergth elements on the largermode s mate color reception possible inareas where even black -and -white is a

problem wi=h ordinary antennas. Natur-ally, an antenna so beautifully designedfor cclor to <es black -and -white in stride.

The unicue (and inimitable) conceptbehind this total superiority is exclusively

Channel Master's-and it's remarkable.The Color Crossfire takes "ProportionalEnergy Absorption"-the famous "powerprinciple" which has made the Crossfirethe world's best selling antenna. Andteams it with our equally unique Tri-BandDirector System.

The Tri-Band Director System. Untilnow, this system could be found only inthe Super -Crossfire. In effect, with itsPhase Controllers, it simplifies and revo-lutionizes director design. By actuallyconserving director space, Channel Mas-ter is able to put more directors to workon the Color -Crossfire crossarm. Thetapered director train gives the greatestpower possible.

Upshot? Higher, cleaner gain than everbefore-right across the entire broadband ... including FM. The Color Cross -fires have more driven elements workingwith greater efficiency than any otherantenna.

More rugged than ever, too! A new"spacer" means easier, more durable in-stallations, and prevents harness short -outs at crossover points, to insure per-manent all -channel reception. ExclusiveE.P.C. "Golden Overcoat."

Any wonder we've got these ColorCrossfires covered by 3 separate patents!

CHANNEL MASTERELLENVILLE, N. Y.

To fit every area need . . . Channel Master makes a complete line of Color Crosstires. Plus a complete line of super -powered Booster -Couplers ... and Super -Torque Rotators (automatic and manual).

AA

Explosion

YouYou may not have thoughtit possible...but

The most

successful*

TV antenna

of all time

is now betterthan ever*More Crossfires have been sold thanany other antennas in TV history.

*Element for element no other antennahas ever matched Crossfire performance.

TO KILL GHOSTS QUICK...(any shade)

AND COLOR THIS GREEN...

Left: Crossfire Coloray, Model 3618CRight: Coloray, Model 3110G

Paint the town with the newChannel Master CROSSFIRE COLORAY

Famous Ghost -Killing ElectronicAntenna Is Now Even Better! Money,money, money. You can make it realbig with the Crossfire Coloray-anantenna that now combines the highgain characteristics of the famedCrossfire with the exceptional front-to- back ratio of an improved Col-oray. It lets you do the best possiblereception job in your specific metro-politan or suburban area . . . incolor or black -and -white.

Two New Models Both WithUnique Dual Impedance. Sell in astrong signal area? You'll want theColoray. For weak -pocket signalareas, where extra gain and ghost-

VHF/FM STEREO BROADBAND ANTENNA SERIES

killing power is needed, the Cross-fire Coloray ... will provide 31/2 DBbetter front -to -back ratio than Col-oray, and 5 DB more gain. Bothmodels have 300 and 75 ohm im-pedance for perfect impedancematch with either 300 ohm twinleador 75 ohm coax.

Expensive Color Sets . . . don'tbounce back when you sell the Col-oray. They stay sold. And remember-an antenna made to murder colorghosts makes short work of theblack -and -white kind. Get in themoney. Cover your town with theColoray.

CHANNEL MASTERELLENVILLE, N. Y.

Unicue Power Equalizer Circuit.Provides front -to -back ratios up to 30 to 1.Ir color and black -and -white. Higher than10 -element yagis cut to each channel.

Exclisive 75 and 300 ohm impedance.Insures ideal color reception for MATV andco -anal home installations.

Exclisive E P.C. "Golden Overcoat" protectsagainst cor-osion.

And who else makes this remarkable guar-antee?

Coloray antennas areguaranteed to eliminate or

minimize ghosts better thanany other antenna type on

the market regardless of sizeor price or your money back.

41Copyright 1965, Channel Master Printed in U.S.A. Reg. U.S. Pot. Off. nod Conodo

_I( SYNC ON BUSINESS

Now that the Excise Tax Cut Bill, HR8371, has been

passed, it should help you sell more FM/stereo component

and other consumer entertainment products. As a service -

dealer, you have until around the first of the year orshortly thereafter to file your floor stock tax refundclaims with manufacturers. The law provides that allsuch claims must be paid to you, either in the form ofcash or credit, no later than February, 1966, according

to information received from the Institute of High Fidelity.

Two capacitor assortments, molded tubular and dippedtubular, have been made available to service technicians.A custom, professional rubber stamp for imprinting servicedealers' own four -line address and telephone numberplus a large roll of 500 colorful pressure -sensitive "service -

seller" stickers are included with each assortment. It's aSprague product and available at your distributor.

The American Society of Certified Engineering Tech-

nicians received the following letter from Dr. WilliamG. Torpey, Manpower Specialist, Executive Office of thePresident, Office of Emergency Planning, Washington,D.C.: "Congratulations to you and your organization on

its first anniversary. ASCET progress during its firsttwelve months-with a membership which has alreadygrown to nearly 1000-augurs well for the future, not onlyfor the Society but also for the cause of engineeringtechnology throughout the nation. Best wishes for thenext twelve months-and many, many more months andyears to come." ELECTRONIC TECHNICIAN has forwardedapproximately 800 reader -inquiries to ASCET during the

past nine months..

A fully -illumi-nated tape re-corder floor standdisplay is de-signed to turnseven sq ft ofspace into a com-plete tape record-er department.The unit hasbuilt-in electricaloutlets for on -the -spot demonstra-tions. It is con-structed of squarechrome - platedtubing and lac-quered displayboard. Availableto Norelco deal-

ers at a cost of $35, fully chargeable to cooperative adver-tising funds. Contact North American Philips, 100 E.42nd St., New York, N.Y. 10017.

"Everybody's Tape Recording Handbook" is a 24 -

page booklet that discusses tape recording in all its aspects.It covers selecting magnetic recording tape, tips on re-cording, care of tapes, choosing a tape recorder, and

AUGUST 1965

top money maker inthe service business

NEW IMPROVED SENCORE CR133

CRT CHECKER & REJUVENATOR

The new, improved CR133 CRT Checker is designed totest all present picture tubes - and it's ready for futuretubes too! Two plug-in replaceable cables contain allsockets required. The compact, 10 lb., CR133 checks CRT

emission, inter -element shorts, control grid cut-off capa-bilities, gas and expected life. Checks all tubes: conven-tional B&W, new low crive B&W, round color tubes and

new rectangular color picture tubes. Exclusive variableG2 Volts from 25 to 325 Volts insures non-obsolescencewhen testing newly announced "semi -low" G2 CRT tubes.New Line Voltage Adjustment insures the most accuratetests possible. Uses well -filtered DC for all checks to avoidtube damage and reading errors. Color guns are indi-vidually tested as recommended by manufacturers. Ex-

clusive automatically controlled rejuvenator applies re-

juvenation (ACR) voltage as required by individual tubecondition; precisely timed to prevent over -rejuvenation ortube damage. The ACR feature is most useful for colortube current equalization to insure propertracking. Hand -wired and steel -encased for tprotection of meter and panel in truck or .)shop, the new improved CR133 is only . . .

The famous CR12d CRT Checker and Rejuvenator is similarto above, but with a three position G2 slide switch andwithout Line Voltage Adjustment at $69.95

professional quality - that's the difference!

1\1C C:s1=1426 SOUTH WESTGATE DRIVE ADDISON, ILLINOIS

. . . for more details circle 42 on postcard29

I I I I I I I I I I I I I I I 11111M" 1111ti'`

/-7f

HOW DIDWINE GARD

PUTFULL SIZE

POWER IN A1/2 SIZE ALL-BAND

(UHF -VHF-FMCOLOR

ANTENNA?

..11111"

WITH

WINEGARDCHROMA-TEL

the newsuper -compact high

gain antennadesigned specifically

for all -band UHF -VHFColor Reception and FM

A big disadvantage of most all -band (UHF, VHF,FM) antennas is that they are larger and heavierthan necessary. This is because they are really VHFantennas with UHF antennas tacked on the frontend. Chroma-Tel isn't. It's super -compact and the

first integrated antenna designed specifically forall -band UHF -VHF color operation.

How did we reduce the size so drastically withoutsacrificing performance?

Two ways. First with our new Chroma-Lens

Director System. With this unique system, we are,for the first time, able to intermix both VHF andUHF directors on the same linear plane withoutany sacrifice of performance.

Second, with Impedance Correlators. These arethe special phasing wires that automatically stepup the impedance of Chroma-Tel's 72 ohm drivenelements to 300 ohms. The correlators make sureeach element has an accurate 300 ohm impedanceat its given frequency. No other antennas with mul-tiple driven elements have this! They also allow usto place the elements only 5%" apart instead of10" to 14" apart as on other all -band antennas,reducing antenna length by one-half.

With the new Winegard Chroma-Tel antenna, wehave eliminated half the bulk, half the wind loading,half the storage space, half thetruck space, and half the weight... yet still have the best work-ing, easiest installing UHF -VHF -FM antenna ever developed!

You give your customers aneater installation that performsas well or better than any otherall -band antenna on the market... and at a much lower price.Compare Performance. You can'tfind an all -channel UHF -VHF -FM antenna that willgive you better results than Chroma-Tel. Look atthe polar patterns. There are no side lobes withChroma-Tel because the elements are straight ...unlike V'd elements that offer an element surfacesideways to the signal, Chroma-Tel's straight ele-

Exclusive WinegardImpedance Correla-tors insure 300 ohmimpedance on eachelement

Compare Size and Price. We've illustrated thesuper -compact Chroma-Tel CT -80 and a com-parable V type antenna. Note the difference insize, price and weight for equal or better per-formance. Because it's even much smaller thanordinary VHF antennas of comparable perform-ance, it is perfect for attic installations, too!

Winegard Chroma-Tel V type (Approximate Figures)Boom Length: 60" 140"Total Weight: 5 lb., 1 oz. 10 lb., 3 oz.

Carton Size: .97 cu. ft. (less than 1) 5.8 cu. ft.Number of

Elements:List Price: $27.50

17 12

$50.00

140"

AUGUST 1965

ments will not pick up ghosts from sides or back.Chroma-Tel's front -to -side ratio is practically in-finite-Chroma-Tel's exceptional front -to -backratio is up to 30 db.

Compare Construction. The Chroma-Tel is Winegardquality throughout ... from its sales -making com-pact 4 -color box, o its weather resistant Gold Vinyl-ized Finish, to its first quality snap -lock hardware.

For complete information on the exciting newWinegard Chroma-Tel All -Band Antenna, ask yourdistributor or write 1111146.11- F"

for Fact -Finder #242 '77 !..

today.

So compact it fits in theback seat of a car

All ChromaTels include Winegard'smodel CS283 UHFVHF signal splitter.Splitter hangs conveniently behind TVset. Separates UHF and VHF signalscoming from antenna to the two sets ofterminals on your set. It's yours FREEwhen you buy Chroma-Tel.

Mnegard Co.Aitenne Systems

3000 Kirkwood Burlington, Iowa... for more details circle 50 on postcard

31

at last...instant color patternsat your finger tips . .

zero warm-up time

ammui-Th4 eat ou dateem,..

di 0 0 0

I

41:211,1

TIBLAVIM0111

A1066

THE ALL NEW SENCORE CG135 DELUXE

TRANSISTORIZED COLOR GENERATOR

The big push is on in Color TV. Equip yourself now withthe new, solid state Sencore CG135 and cash in on thezooming volume of new service business as Color -TVbooms! Instant, service -ready RCA standard color bars,cross -hatch, white dots and individual vertical and hori-zontal bars enable you to set up or trouble -shoot moreColor TV sets per day; earn top money in this fast growingservice field. It's an analyzer too: Color gun interruptors,unmodulated video for chroma circuit trouble isolation andunmodulated sync pulses to keep Zenith receivers in syncfor this test, make color trouble shooting a snap. Sturdyall -steel contruction for rugged, heavyduty in the field or shop. Another BestBuy in profit -building service instruments

$14995from Sencore at

COMPARE THESE FEATURES: SEE WHY THE CG135 IS IN A CLASSBY ITSELF

Solid state construction employs high priced GE "Unijunctions" todevelop six "jump out proof counters' that guarantee stable patternsat all times with no worm -up Standard RCA licensed patterns asshown on schematics throughout the industry Handy universal colorgun interruptors on front panel Lead piercing clips insure non -obsolescence CRT adaptors optional Crystal -Controlled 4.SmcSound Carrier Analyzing Signal to insure correct setting of finetuning control RF output on Channel 4 adjustable to Channel 3or 5 from front of generator when Channel 4 is being used Nobatteries to run down; uses 115 V AC Less than one foot square,weighs only 8 lbs.

professional quality - that's the difference!

426 SOUTH WESTGATE DRIVE ADDISON, ILLINOIS

SYNC ON BUSINESS

caring for a tape recorder. You can use this booklet tobuild your business. Write on your letterhead or inclosebusiness card to Magnetic Tape Div., Sarkes TarzianInc., East Hillside Drive, Bloomington, Ind.

Business -mind-ed independentservice - dealersare being prom-ised "new moneyin their pockets"with a hot itemthat could not bemore timely. Pre-fabricated elec-tronic "buildingblocks" designedfor walk-in do-it-

yourselfer quick sales can be assembled in minutes withonly a screwdriver. And if a customer doesn't feel sosure of himself, you can do a fast custom -installed jobin minutes with these units. They include home intercomsystems, nursery monitors, remote control actuators andpiped -in music-as some of the 20 projects available.They should go well all year round-particularly in themonths before Christmas. See your jobber or contactInternational Rectifier Corp., 233 Kansas St., El Segundo,Calif.

A special hotel/motel TV set is made by SylvaniaElectric Products Inc. The number is 19T51GY and it isequipped for either a 75 or 300 i2 antenna.

Accurate resistors in a range of values can be easilymade up by using resistance wire kits available fromQuality Electric Co. of Los Angeles, Calif. Each spool ofwire is clearly marked in ohms -per -ft and requires onlya ruler to achieve good accuracy.

A miniature selenium rectifier for radio and phonoservice is available from International Rectifier Corp.'s800 distributors. The T065U's are rated at 65 ma dcoutput and 130 v maximum RMS input. At I -R distribu-tors.

Industrial timer information is available from G -E,Schenectady 5, N.Y. Ask for GEA-7668.

A special $1 offer is being made to TV -radio service -dealers who use -test an indoor antenna that retails for$4.95. The manufacturer offers to return the $1 to anyservice -dealer who finds the antenna fails to meet manu-facturer's claims. You have to send the dollar with busi-ness card or letterhead direct to Snyder Mfg. Co., West-moreland and Stokley Streets, Philadelphia, Pa. 19140.

Universal color TV replacement rectifier kits, partnumber 16-500, are made by GC Electronics. Available atyour jobber.

... for more details circle 43 on postcard32


Congress DIDN'T GO FAR ENOUGH!

PUBLIC LAW 87-529; 76 STAT. 150[H. R. 8031[

An Act to amend the Communications Act of 1934 in order to give the Fed-eral Communications Commission certain regulatory authority overtelevision receiving apparatus.

Be it enacted by the Senate and !louse of Representatives of the UnitedStates of America in Congress assembled, That:

Section 303 of the Communications Act of 1934 (47 U.S.C. 303)34is amended by inserting at the end thereof the following:

"(s) Having authority to require that apparatus designed to receivetelevision pictures broadcast simultaneously with sound he capableof adequately receiving all frequencies allocated by the Commissionto television broadcasting when such apparatus is shipped in inter-state commerce, or is imported from any foreign country into theUnited States, for sale or resale to the public."

Sec. 2. Part I of title III of the Communications Act of 1934 isamended by inserting at the end thereof a new section as follows:

.131_THEY SHOULD, II AL"-that all 82 -channel televisionreceivers* must use an 82 -channeltelevision antenna."Of course, you can't take the law intoyour own hands-but you can takeadvantage of today's ready-made op-portunities to sell an 82 -channel an-tenna with each 82 -channel TV set.Our Antenna Research Laboratoriesin Champaign, Illinois knew whatthey were doing when they teamedthe acclaimed Log Periodic conceptof the University of Illinois AntennaResearch Laboratories with our newantenna design advance-the capaci-tor -coupled electronic dipole. Proofis the fact that the JFD LPV-VU isAmerica's No. 1 82 -channel TV/FMantenna!Who says you can't have everything

If

you want in a TV antenna-VHF?UHF? . . . FM Stereo ? - with a singledown -lead to boot!MOST EFFICIENT PERFORM-ANCE EVER ON VHF, UHF, FM/STEREO FROM ONE ANTENNAUSING ONE DOWN -LEAD! Cap -electronic dipole design makes

more elements resonate on chan-nels 7 to 13 with a correspondingincrease in gain.

Higher mode operation in UHFband achieves higher gain on chan-nels 14 to 83-and FM stereo.

Narrower beamwidths . . . higherfront -to -back ratios step up ghostrejection . .. intensify color.

Patented frequency independentdesign maintains peak perform -

4.4

I I

ance ciaracteristics regardless ofchannel or band tuned.

Includes 3 -way splitter so singledown -lead can be tied into individ-ual VHF, UHF and FM systeminputs.

REMEMBER - AN 82 -CHANNELTV SET IS NOT AN 82 -CHANNELTV RECEIVER UNLESS IT HASAN 82 -CHANNEL TV ANTENNA!*Lest we forget - every color set isalso an 82 -channel set requiring acolor -perfect antenna. In fact, manycolor TV shows are broadcast onUH F channels.

FDSEE YOUR DISTRIBUTOR ORWRITE FOR BF'00HORF. 806

Model LPV-VU18 Model LPV-VU15 Model LPV-VU12 Model LPV-VU9 Model LPVVU6

JFD LPV-VU LOG PERIODICS for channels 2 to 83 and FM/Stereo.

JFD ELECTRONICS CORPORATIONlEth Ave. at 62nd Street, Brooklyn, N.Y. 11219

JFD Electronics -Southern Inc.Oxford. North Carolina

JFD InternationalE4.14 Woodside Ave., Woodside 7', N.Y.

JFD Canada, Ltd.,51 McCormack Street, Toronto, Ontario, Canada

1,..d1.6 Under Ono o, Mo,r of U S POWs 2.951 011, 2.185.171. 3.011.161. 3.101 210. 3.150 376 9.0 1067 °nal POWs Pend,nd 51 and C...d. Produc. by 00 f ocIfen.cs Ccro1,17,on ens r olc,us,re (e t. ty of ,,no s

. . . for more details circle 30 on postcard

BUR

PARATOR

177

SeeRS01 2.7K

SO2

r100 o,- »-:0: DP

1.I or ESC!

J \.]

44 PP

CS021 .001

nO PP

51.A8,1,1111 L"Z' 1401111 OSC

EMERSON

TV Chassis 12077 - Circuit Descriptions and Operations (See TEKFAXNo. 938 July 1965 ELECTRONIC TECHNICIAN)

Video Amplifiers: The video amplifier Q9 is an NPNsilicon transistor operating from a collector supply voltageof +160v. This voltage is obtained by rectifying the pulsetapped off the primary of the high voltage transformer.In the absence of a signal from the video detector, thevideo amplifier is biased to conduction so that its collectorvoltage is approximately +20v. This bias is applied to theemitter from the voltage division of resistors R55 and R59.The resulting negative base voltage is partially counter-balanced by the flow of current through R50 so that thevoltage across the video detector diode remains practicallyat zero. This biasing arrangement, in the absence of signal,reduces the video amplifier gain and no snow appears onthe CRT. If the voltage is too high, the maximum avail-able video drive is reduced.

As the negative going signal is applied to the base ofthe video amplifier, the sync tips drive the video amplifiertoward cutoff and appear at the collector as a positivegoing signal, which is then applied to the cathode of theCRT through C44.

The collector of the video amplifier supplies 4.5 Mcto the audio IF amplifier through transformer 11. Thistransformer also acts as a trap to reduce the amount of4.5 Mc beat interference visible in the picture. The videoamplifier also supplies a sync positive signal to the AGCamplifier and the sync separator.

4.5 Mc Sound IF: The 4.5 Mc audio is amplified andlimited by two stages, with the limiting done principallyby the second stage.

The FM audio detector is of the conventional discrimi-nator type and except for the impedance of the circuit, itlooks very much like the types used in tube receivers.

Audio: This receiver utilizes a class "A" audio systemconsisting of a driver and an output stage capable of de-livering 500 mw of undistorted output. The input stageoperates between B- and chassis ground. The collectorof this stage is directly coupled to the base of the outputtransistor which operates between B- and B+ withB- applied to the emitter through R21 and B+ applied tothe collector through the primary of the output trans-former. B+, in this circuit, is +24v and B- is -32v.This difference of potential of approximately 50v isacross the collector -emitter junction, with the collectorpositively biased with respect to the emitter. This arrange-ment improves the efficiency of the audio system and keepsthe total current drain down to a minimum.

AGC Amplifier: The sync positive signal from thecollector of the video amplifier is divided down towardsthe -18-v bus, by the combined resistance of R56,R57A and R58, resulting in a voltage only slightly higherthan chassis potential. The signal is then taken off thevariable arm of R57A and applied to the base of the AGCamplifier. The emitter of this NPN transistor is connectedto a secondary winding of the high voltage transformer, atwhich point there exists a 7-v negative pulse. This pulseis attenuated by R54 before application to the emitter ofthe AGC amplifier. With relatively low levels of sync posi-tive (low antenna signal) applied to the base, this transis-

VII1290611

HORIZ OUTPUT

1.12V PP

41212411

DPAIPtIl 1-5a3

1 RSIO

1+44

tor will be cut off. In this off state resistors R53, R40,R32 and R31 divide the +150 v to +5 v for the tunerAGC and +3 v for IF AGC, resulting in maximum gainfor these sections. If a stronger signal is received, resultingin higher levels of sync positive at the base of the AGCamplifier, the transistor will turn on, but only if thesepositive sync tips coincide with the negative horizontalpulse at the emitter. With the transistor conducting, the150 v will be divided down to a lower level than previous-ly, resulting in lesser voltages for both tuner and IF AGC.These lower AGC voltages will decrease the gain of boththe tuner and the first two IF stages. R57A controls theamplitude of the positive sync tips applied to the base ofthe AGC amplifier and is adjusted for maximum videodrive without overload. Buzz is usually the first sign ofoverload.

GENERAL ELECTRIC

TV Chassis TA, AGC Stages - Circuit Operation

The tuner RF transistor and the 1st and 2nd IF ampli-fier transistors, Q4 and Q5, are biased to operate such thatan increase in emitter current reduces the gain.

Since these three transistors are NPN types, currentis increased by making the base voltage more positive andgain is thereby decreased.

Q11 has a pulse from the horizontal output transformerimpressed on its collector and a positive -going compositevideo signal on its base. Q11 will therefore conduct duringthe sync pulse interval and its conduction will change inrelation to the sync pulse level which is proportional tothe signal strength.

For an increase in signal, Q11 will conduct heaviercausing the voltage across R153 and R154 to increase.

MS.

04

0'O

n

This decreases the voltage on the base of Q10 causing itsconduction to decrease. A reduction in the collector cur-rent of Q10 raises the positive voltage at the junction ofR152 and R315 which is the AGC voltage impressed,through RC filters, on the bases of Q4 and Q5, the 1st and2nd video IF amplifier transistors. Since this is a rise inthe forward bias of those two stages, the gains will de-crease.

In addition to reducing the IF gain, the RF gain will34


NOW!

OVER 2700

REPLACEMENTSwith only 13 RCA Top -of -the -Line transistors

With RCA's "Top of the Line" SK Replacement Series, you need only 13 transistors,including two matched pairs for ready replacement of more than 2700 types. In addition, RCA's two new SK Series rectifiers-the SK3016 and SK3017 -enable you toreplace virtually any selenium or silicon rectifiers having comparable ratings.

Stock the complete SK Series 13 transistors and 2 rectifiers. They wit provide theanswer to many of the replacement problems you face servicing auto radios, battery -operated portable radios, tape recorders. hi-fiequipment. phonographs, black -andwhite and color TV. and other entertainment -type equipment using solid state devices.

Accurate, comprehensive replacement information is given in the new 16 page RCA"Top of the Line" Semiconductor Replacement Guide SPG 202 With it you have atyour fingertips information on more than 2700 transistor types, including many of

foreign manufacture -which the 13 RCA "Top of the -Line" types replace.

See your RCA Distributor about the RCA SK Series, and be sure to ask for your cop

of the RCA Semiconductor Replacement Guide.

RCA ELECTRONIC COMPONENTS AND DEVICES. HARRISON. N A.

The Most Trusted Name in Electronics

"Top -of -the -Line Replacement Transistors"SK -3003 pnp type, AF Driver and Output Stages

(9 V Supply)SK -3004 pnp type, AF Driver and Output Stages

(15 V Supply)SK -3005 pnp type, RF, IF, and Converter Stages

of Broadcast ReceiversSK -3006 pnp type, RF, IF, and Converter Stages

of FM and AM/FM ReceiversSK -3007 pnp type, RF, IF, and Converter Stages

of All -Wave ReceiversSK -3008 pnp type, RF, IF, and Converter Stages

of Auto RadiosSK -3009 pnp type, Audio Output Stages of Auto Radios

SK -3010 npn type, AF Driver and Output Stagesof Eroadcast Receivers

SK -3011 npn type, RF, IF, and Converter Stagesof Eroadcast Receivers

SK -3012 pnp type, Audio Output Stages of Auto RadiosSK3013 Matched pair of SK -3009SK3014 Drift Field type for Output and Driver Stages

of Hi-Fi equipmentSK -3015 Matched pair of SK -3014SK -3016 Silicon Rectifier for color, B,'W TV,

Radios, PhonographsSK -3017 Silicon Rectifier for color, B,'W TV,

Radios, Phonographs


NEW JERROLDALL -SOLI D -STATE

"DE-SNOWER" Model SPC-132...the most powerful

of all antenna amplifiers

Do you remember the original and famous JerroldDe-Snower? Thousands of De-Snower preamplifiershave served fringe -area antenna systems since 1950,amplifying weak television signals at the antenna be-fore downlead loss. Now every benefit of the originalDe-Snower, and more, is offered by the new SPC-132all -solid-state antenna amplifier.

Jerrold has combined the ultra -sensitive twin -tran-sistor preamp, SPC, with a compact three -transistorpostamp, 132, to give you the powerful double -punchperformance of this unusual new antenna amplifier-with absolutely no tubes to replace.

30 db high -band gain* 26 db low -band gain* Lowest input noise figure Highest output capability(100,000 microvolts each of 7 channels)

Use the SPC-132 on your next "tough -dog" antennasystem-custom home or multi -set installation. Driveas many as 20 to 30 sets from one antenna system.

Only $97.95 list. Ask your Jerrolddistributor or write Jerrold Elec-tronics, Distributor Sales Divi-sion, Philadelphia, Pa. 19132.Measured average production unit

The nation's foremost manufacturer and supplierof television antenna systems and equipment

1E1111010ELECTRONICS

TECHNICAL DIGEST

also be reduced through the action of Q9.Q9, a PNP transistor, will conduct heavier when its

base becomes less positive, producing a higher positivevoltage across R147. The voltage across R147 is set forlow signal levels by its divider action with R148. Thissets the level of IE.

As Q5 conduction is increased to lower its gain, thevoltage across C125 decreases. Since this voltage is im-pressed on the base of Q9 through R151, Q9 will increaseits conduction, drawing more current through R147 andthereby raising the RF AGC voltage. Since the RF transis-tor, like those in the IF, is biased to go down in gainwith an increase in conduction, the increased AGC voltageon its base will increase conduction and reduce its gain.

MOTOROLAColor TV Chassis WTS 907 or TS-908-Service Experience Information

Symptom: Set overloads when tuned to strong signals.Solution: Replace 0.02 ktf capacitor, C124.

Symptom: Color indicator light will not stay lit duringentire hue control rotation. Solution: COLOR KILLER con-trol incorrectly adjusted and should be readjusted.

Symptom: Insufficient brightness. The customer bright-ness control does not have sufficient range to cause theHV to go off the regulator even when the master GIcontrol is full clockwise. Solution: This could result froma loss of blanker pulse on the color difference amp's orfrom a contrast control that has increased in value. Onecase of blanker malfunction has been traced to an openR920.

Symptom: Severe vertical fold -over. Solution: Replace0.0033 pi capacitor, C602.

Symptom: Vertical buzz in sound, frequency varieswith vertical hold control. Solution: Dress all leads awayfrom the audio leads at the point they enter the 12 pinplug underneath the chassis. The audio cable is the onewith two leads inside one shield.

PHILCOColor TV Chassis 15M91-Field Sorvico Information

Sound IF Padding: In the event of sync buzz in theaudio, check (L2) interstage transformer bottom core formaximum output. The bottom core of L2 can be peakedat two different settings. The proper setting should bewith the bottom core closest to the circuit panel. Thebottom core can be adjusted from the top of the trans-former without the need to pull the chassis.

Proper Lead Dress, Sound Det. RFC (L40): RFC L40located on the video IF panel between lugs M72 and M73must be dressed up and away from the bottom of thecircuit panel. If it is dressed against the panel, someevidence of sync buzz may occur when tuning towardsmear.

Vertical Bands or Lines During Blank Raster: Thepurple lead running from lug M36 on the chroma panelto socket J1 pin 8 should be dressed away from thedelay line (DL1) and copper on circuit panel where lugM33 connects to RL network N3. Proper dressing of thislead should remove the vertical bands from the rasterduring the absence of video.

36



SAVE MOST ON DEPENDABLETEST INSTRUMENTS

BUILD YOUR OWN QUALITY

knight -kits

KG.635 5 -Inch DC to5.2 Mc Wideband Os-cilloscope Kit. $99.95

KG -201 Solid -StateMotor Speed/LightControl Kit. $9.95

KG625 VTVM Kitwith 1/2 -Volt Full -ScaleDC Range. IncludesProbe. $36.95

KG -375 SolidStateUniversal Auto Ana-lyzer Kit. $49.95

KG -650 RF SignalGenerator Kit-wide-range, extremelystable. $23.95

See dozens of other great Knight -Kits:Stereo Hi-Fi, CB, Short -Wave, Ama-teur, Automotive, Test Instrument, In-tercom-easiest to build, and the savingsare substantial.

YOUR COMPLETE SUPPLY SOURCE: One order toAllied fills the whole bill for all the electronicparts and servicing equipment you need.

Use the convenient Allied CreditFund Plan-over 24 months to payEASY TERMS

ALLIED RADIOEverything for the Electronics Service Technician

FREEALLIED

1966 CATALOGsend for it today!

508 VALUE -PACKED PAGES

efq-zru;eghtzeELECTRONICS TECHNICIAN

World's Largest Stocks ofElectronic Parts

TV Tubes, Antennas, Accessories

Replaceiment Tubes & Transistors

Test !nstruments & Meters

Servicing Tools & Hardware

Automotive Electronics

P.A. & Intercom Systems

Ever /thin, in Stereo Hi-fiTape Recorders & Tape

2 -Way CB Radio

PROMPT SHIPMENT FROM STOCK

FOR ALL YOUR SERVICING NEEDS

MAIL COUPON TODAY

ALLIED RADIO, Dept. 28 -ti100 N. Western Ave., Chicago, Illinois 60680

Send FREE 1966 Allied Catalog.

Name

Address

City

IV

send forFREE

CATALOG!

State Zip

... for more details circle I I on postcard

AUGUST 196539

TUNER REPAIRS

Sarkes Tarzian, Inc., largest manufacturer of TV and FMtuners, maintains two completely -equipped Service Centersto serve YOU. Both centers are staffed by well -trainedtechnicians in this specialized field and are assisted byengineering personnel to assure you of FAST, DEPEND-ABLE service.

Tarzian-made tuners --identified by this stamping --received one day will be repaired and shipped out

the next. A little more time may be required on other makes.Every channel is checked and re -aligned per manufacturer'sspecifications, not just the channels which might exist inany given area.

You get a 12 -month guarantee against defective work-manship and parts failure due to normal usuage. Cost toyou is only $9.50 and $15 for UV combinations, includingall labor and parts except tubes. No additional costs. Nohidden charges. All tuners repaired on approved, open ac-counts. You pay shipping. Replacements on tuners beyondpractical repair are available at low cost.

FOR COMPLETE OVERHAUL

Includes ALL parts (except tubes)ALL labor on ALL makes

24 -HOUR SERVICE with

FULL YEAR WARRANTY

When inquiring about service on other than Tarzian-madetuners, always send TV make, chassis and Model number.Check with your local distributor for Sarkes Tarzian replace-ment tuners, parts, or repair service. Or, use the addressnearest you for fast factory repair service.

\-7-1SARKES TARZIAN, INC.TUNER SERVICE DIVISION

See your distributor, or use the address nearest you

537 South Walnut St.,

Bloomington, IndianaTel: 332-6055

10654 Magnolia Blvd.,

North Hollywood, Calif.Tel: 769-2720

Manufacturers of Tuners ... Semiconductors ... Air Trimmers ... FM Radios AM - FM Radios ... Audio Tape .. Broadcast Equipment

40 ELECTRONIC TECHNICIAN

Meet competition and make

a good profit on elaborate

antenna installations

4 Veaffea et140

ONE MAN CAN

ERECT FRINGE

AREA ANTENNAS

Part I

Typical rural or small town com-munities, a hundred miles or morefrom a TV or FM transmitting sta-tion, will frequently be serviced byone or more small, independentone- or two -man shops. Elaborateantenna installations are requiredin these fringe- or deep -fringe areasfor satisfactory TV reception -particularly for good color recep-tion. And these installations costthe TV viewer considerable money-in some cases more than the TVset. But in most situations, one ex-perienced, well-equipped techniciancan handle these jobs efficiently,meet competition and make a goodprofit on the installation. A plannedapproach can eliminate the need fortwo men or the necessity of hiringan untrained part-timer who willcost considerable money.

If you go into this kind of work,however, make sure you do the jobwell and use the best antenna equip-ment and accessories you can buy.Don't be tempted to indulge in"shortcuts" or use "bargain -coun-ter" material. Since most situationswill differ because of distance tothe transmitting station, terrain,proximity of obstructions, and thelimited amount of money some cus-tomers can afford to spend, alwaysgive your customer a simple, directexplanation for everything that youdo. If a complaint arises about the

ELECTRONICTECHNICIAN

AUGUST 1965

price, show him what he is gettingfor his money and why. If you fol-low these guide -lines the TV ownerwill rely on your judgment whenfurther service is required. Remem-ber, sooner or later you may becalled on to repair damages done tothe installation by unusual wind-storms, winter icing or you may evenbe asked to move it.

Let's proceed to a typical loca-tion and make a preliminary survey.Our hypothetical installation site isbetween TV stations in two direc-tions about 75 and 100 miles away.The terrain is fairly open, flat coun-tryside - a small-town residentialarea with one- and two -floor houseshaving lawns and trees and powerlines around them. You know fromthe beginning that you'll need arotator. And if no UHF stations aretelecasting or planned in this areain the near future, you can make arough "guesstimate" that a goodhigh -gain VHF broad -banded yagi-or log -periodic type antenna,mounted about 40 ft above groundlevel, will give optimum results.

But if you are not thoroughlyfamiliar with the area - don't al-ready know what a given antennawill do here and you do have field -strength measuring equipment -then measure the signal first. Youshould have 100 µV from eachchannel received on whatever an -

AUGUST 1965 41

tenna you use or plan to select andat the height you intend to erect it.You can measure the signal eitherfrom near ground level on yourfield -strength meter and adjustablehalf -wave dipole or temporarily runup the antenna you plan to use andmeasure the signal direct. If youmeasure the signal on the field -strength setup near ground level, ofcourse, you'll have to calculate orestimate (if you've had previous ex-perience in the area) what yoursignal -strength will be on the an-tenna you intend to use at the heightyou plan to mount it. But don't for-get to make allowances for lead-in

_

losses during wet weather based onwhatever kind of lead-in you intendto use. In this business it is helpfulto know the db loss of your lead-in,wet vs dry, and the db gain of yourantenna on each channel you planto receive. This data is availablefrom manufacturers' literature. Weassume here that you already have areasonably good idea about the an-tenna you plan to use, based onprevious experience in your neigh-borhood, so we will concentrateprimarily on mast, accessories andinstallation problems.

Mast and AccessoriesSelect a good, heavy-duty, cor-

rosion -resistant tubular telescoping -type mast. A 40 ft mast in four sec-tions is best. A 50 -ft, five -sectionmast is about maximum height forone man to handle safely. For housetop mount, 30 -ft, three -sections ismaximum. For the customer who

needs or can afford to go higher,switch to the triangular, telescoping,crank -up tower. And if a customerinsists that you use left -over gas orwater pipe he has on hand, thenrun - don't walk - back to yourshop, and don't look back. Pick amast with "L" locking screws. Noth-ing can be more frustrating andtime consuming than a rusty slottedset screw that won't let go. And youwill find that the heavy, corrosion-resistant tubing will slip up anddown easily year after year even ina strong breeze.

You have a number of rotors toselect from. My setup calls for theoffset type with thrust bearingmounted above the rotor. If the ro-tor should require shop work I candrop it off the mast and leave theantenna supported temporarily bythe thrust bearing.

Select a good guy -wire. A 6x18stranded, corrosion -resistant orhardened aluminum alloy, depend-ing on the antenna price, is best.

Various types of wall bracketsare available. I keep a few whichhave two -in. clearance and somewith eight -in. clearance for oldertype overhanging roofs. Heavythree -in. screweyes are adequatefor guy anchoring in most cases oninstallations up to 50 ft. Used har-row discs with a 1/2 in. pipe stakedriven through the center hole makea quick ground mount base for yourmast. A want ad in your local paper


will bring farm boys in with bushelsof them at 50¢ apiece.

When you find a mast, antennaor other equipment that fits in bestwith your particular operation, stickwith it until something better ismade. If you standardize your in-stallations and procedures, you'llsave much time.

The large, single flat -top, allchannel antenna suits my operationbest. The antenna I use folds andunfolds easily, locks positively, andhas a folded dipole for easy lead-incontinuity checking. And if yourfavorite antenna doesn't have lock-ed terminal bolts, put lock nuts onit before you put it up. If it hassheet aluminum wing nuts on thelead-in terminal bolts, replace themwith machined types. You'll blessyour foresight the first cold, driz-zly day you have to replace a lead-in.

You can buy repair parts for any'good brand of antenna or rotator.Keep parts on hand that you rou-tinely need after a wind or electricalstorm. And by using the same typesconsistently you will find your"bone pile" a good source for parts.

Tools You'll NeedYour one-man installations will

be made easier and quicker andthus more profitable if you have theproper tools on hand. You'll needthe usual array of hand tools. A 36 -ft extension ladder will put you on

top of most two story houses. Two16 -ft straight aluminum ladderswith roof hooks are necessary. Butmake sure you don't go poking al-uminum ladders around poorly in-sulated power lines. Additionally,a 10 -ft aluminum ladder is helpful.You'll need it for those roof -mount-ed telescoping masts and for gettingunderneath low overhanging eaves.One 5 or 6 ft stepladder will roundout the ladder department. You'llneed it for a multitude of jobs, in-cluding driving tee -posts for ground -mounted guy anchors.

Other tools include: 1/2, 'A and3/16 in. bits to drill starting holesfor screweyes and mounting brack-ets. A battery -powered hand drillis ideal for this work. If you don'thave one, you'll need a good heavyextension cable long enough to runinto the house or garage for power.

Your most -used tools will be apair of heavy, 6 -in. side cuttingpliers and a pair of slip -joint(water -pump) pliers for openingand closing standoff insulators andto substitute for vise, pipe wrench,the socket wrench you left at theshop, etc. Add to this 'A, 3/8, 7/16and 1/2 in. hex wrenches. A sledgehammer, crowbar and a short chainfor pulling tee -posts when movingantennas are others you'll need. A

in., 75 ft length of rope with asingle pulley equipped with a slid-ing -lock swivel snap, a prop made oftwo 1 x 2 in. x 5 ft pieces of lum-

ber to support mast while assem-bling antenna just about rounds outthe tool list.

Comfort and SafetyWe can't avoid saying a few

words here about your workingcomfort and safety. A pair of "clod-hopper" type, ankle -height shoeswill prevent turned ankles. Theyshould be thick -soled for easystanding on ladders and soles shouldbe cork and composition for besttraction on roofs. And don't for-get to wear cuffless trousers to pre-vent snagging on ladder bracketsand other protrusions. Wear shirtsand jackets with loose collars, es-pecially in cold weather when wear-ing extra clothing. When workingwith arms above your head, lookingup and concentrating on whatyou're doing, it is easy to retardcirculation to your head with snugfitting collars or hoods. This canresult in dizziness or fainting withdire results. Always be careful, bemethodical. If you hurry, you mayat best have to retrace your work- at worst, you may never workagain. When guy wires are attach-ed to the mast and cut to length,bend up the ends an inch or so toprevent the end poking you in theeye.

Next month we will go into fullinstallation details how one mancan install antennas up to 50 ft inheight.

AUGUST 1965 43

There's Money in Master

According to the latest informa-tion from the U.S. Census Bureau,the population of this country is get-ting younger. This population ex-plosion means more young families,more multiple -dwelling houses. Andthis trend intensifies growth of thealready expanding master antennasystems field, in TV and FM, VHFand UHF. And you'll have to serv-ice a lot of TV sets to equal theprofit from one modest sized MATVinstallation. Further, each TV setconnected to your MATV systemmeans a potential new service cus-tomer for you.

Before you can install a mastersystem, however, you must sell itfirst. This is not always as easy asit sounds. Each type of system re-quires a different sales approach.

Horne SystemsTwo basic ways are open for sell-

ing home MATV systems. First,you can use suggestive selling onyour antenna customers:

"As long as you're putting up anantenna now, Mrs. Jones, it wouldpay you to have a complete homemaster TV system installed. Thatway, you can have an outlet inevery room. Let me give you anestimate of what it would cost."

Second, you can promote MATVsystems in new homes, even beforethey're completed:

"Let me put a complete masterTV system in your home right now.Since the walls are still open, youcan get a very neat job and save atremendous amount in installationtime. Of course you're not going tohave a TV set in every room. Buta MATV system gives you completeflexibility. And you can move your

portable into any room in the house,or out on the patio."

This appeal is successful not onlywith new home owners, but withdevelopment builders, especially inweak signal areas. Be sure to men-tion that the system can also includeFM stereo.

Hotels and MotelsUnfortunately, the hotel -motel

field is very hard to crack at thistime. Virtually every hotel and mo-tel being built today includesMATV, but they are sold by theTV set manufacturers who general-ly throw in the MATV system alongwith the deal for the TV sets.

Unless you're experienced, don'twaste your time with this market.Stick to older and smaller motels-those avoided by the TV manufac-turers. To sell this market, youshould deal directly with the ownersor operators of the building.

Apartment HousesTo sell systems in existing apart-

ment houses, you should deal di-rectly with the owners or the realestate management company. Pointout how a MATV system can im-prove the value of the building with-out costing them a cent (the tenantpays a monthly fee). If you havethe financial resources, offer a leas-ing deal-you install the systemand collect monthly from tenants.

New apartment buildings requirea different approach. Here, youmust work through the consultingengineer and the electrical contrac-tor who will generally subcontractthe MATV job. Try to get theequipment you offer written intothe specifications. Then, you will

6'y 444 ea.,eJerrold Electronics Corp.

Broadband Paralog antenna is suitable forareas were all channels come from samedirection.

Single channel amplifier strips mounted incabinet.

usually have to submit a competi-tive bid to get the job.

Schools

More schools are being builtevery year. And schools are an ex-cellent market for MATV systems.With the current emphasis on edu-cational TV, every school in thecountry will soon need a system.And many school officials prefer towork with a reliable local firm thanto deal with some large outfit lo-cated many miles away. Canvas theschools in your area and find outwhat their plans are for ETV.

You must be prepared to work

4.4ELECTRONIC TECHNICIAN

Antenna SystemsStart negotiating with local building contractors whenmultiple -dwelling plans are being drawn up

ar.o.

Single channel Yagi-typo antennas serving a

with the school boards and schoolprincipals, as well as audio-visualdirectors and consulting engineers.

One basic requirement to sellingMATV systems is that you be ableto design a system that works well-at the lowest possible cost. It'seasy to design a system that worksif money is no object. Most MATVsystems are sold by competitive bid,however. Only the technician whoreally knows what he is doing candesign a system that works properlybut includes minimum equipment.

AntennasThe same knowledge you have

of choosing and installing antennas

AUGUST 1965

large apartment house MATV system.

for homes also applies to MATVsystems. In practice, however, thereare two important differences. First,you can afford to spend more timeand money determining signal condi-tions. Second, you can use more andbetter antennas on higher masts.

Two basic antenna types are in-volved - broadband and singlechannel. As the names imply, singlechannel antennas are cut to receiveonly one specific channel, while abroadband antenna receives a num-ber of channels.

When do you use a single chan-nel antenna and when do you go

Balun is used to match 30011 TVantenna to 7.5! coaxial cable.

broadband? In general, single chan-nel antennas work better, but broad-band antennas may allow you to dothe job at a more competitive price- depending on reception condi-tions in a particular location.

The rule of thumb is to use abroadband antenna in every systemwhere all channels are coming fromthe same direction unless it is alarge system (200 or more outlets)or it's plagued with ghosts.

AmplifiersLike antennas, two types of am-

plifiers are available - single chan-nel and broadband.

Broadband amplifiers are gener-ally used with broadband antennasand single channel amplifiers withsingle channel antennas.

Single channel amplifiers costmore, but they have two advantagesover broadbands: 1. If one channelgoes out, the others continue tooperate. 2. Single channel amplifierscan generally produce more undis-torted signal output to serve largesystems. (Recently, however, veryhigh output broadband amplifiershave been made available.)

The two most important ampli-fier characteristics are gain and out -

'Herringbone' pattren caused byadjacent channel interference.

put capability. You must choose anamplifier that can take the avail-able signal and make it strongenough to overcome the losses.

BalunsMost antennas have a nominal

characteristic impedence of 3000.But MATV systems use coaxialcable, with a characteristic imped-ance of 75n. And most MATVamplifiers have an input impedanceof 75 n. Therefore, the antennasmust be matched to 75f2 with amatching transformer, generallycalled a balun. The balun is oftenmast mounted-hence, waterproof.

MixersTo use a broadband amplifier

with single channel antennas, youhave to combine the antenna out-puts into a single line. The mixerdoes this. It is recommended thatfiltered mixers be used. Becausethese units are tuned to specific fre-quencies, there's little loss.

PreamplifiersEssentially, a preamplifier has a

low noise figure. To take advan-tage of the best possible signal-to-noise ratio, it is usually mast mount-

ed. Once the signal-to-noise ratiodeteriorates, no amount of ampli-fication will improve it. Preampli-fiers are generally used in weaksignal areas where channels are re-ceived at less than 1000p.v. Theymay be either broadband or singlechannel. Most preamplifiers are re-motely powered on the lead-in.

Filters and TrapsSome kind of RFI is always with

us. Some can be eliminated bycareful antenna orientation, butothers must be filtered or trappedout. MATV filters generally pass aband of about 6 Mc, attenuating allother freqeuncies. If either channel2 or 4 is very strong, for instance,adjacent channel interference willresult. And filters will not be ad-equate to eliminate this interfer-ence. What you need now is a trapwhich attenuates sharply one spec-ific frequency.

Traps have one disadvantage.They tend to drift, especially withtemperature changes. To avoidcallbacks, use filters wherever pos-sible. Filters do a good job if theinterfering frequencies are farenough away from the frequenciesyou want to pass.


Typical System DesignLet's suppose we have a five -

floor building, with 16 rooms oneach floor. We need a TV outletin every room, or a total of 80 out-lets. First, we split the signal in halfwith a 2 -way splitter. Then, wesplit each of the halves into eightparts, giving us a total of 16 lines.Each line serves one room on eachfloor. In practice, we plan our cableto be run as easily as possible in thespecific building involved.

Now that we've taken the signalinto each room, we must find someway of taking it off for the individ-ual TV set. This job is done witha "tap -off." As the name implies,a small portion of the signal is tap-ped off by this device, without dis-turbing the signal on the main cableline. Finally, the 7512 output of thetap -off must be matched to the30012 input of the TV set. The endof each line is terminated with a75i resistor, to maintain match.

Once the distribution system islaid out, we must calculate its loss-es. This is not difficult.

We have to make sure that everyTV set in the system gets enoughsignal. How much is enough signal?This varies by individual TV receiv-

er, but we allow 1000 or across75 St - giving plenty of tolerance.We establish this 1000 tav as ourstandard and call it 0 dbj.

To calculate the distribution sys-tem loss, we simply start at the out-put of the head -end and work ourway to the end of the longest linein the system. If the last TV setat the end of this line gets at least0 dbj on every channel, we knowthe system will work.

A 2 -way splitter causes 3.5 dbloss, and an 8 -way splitter loses 10db. After the splitters, the signalgoes through five splitters to getto the end of the line. A splitteractually causes two types of losses:feed -through loss and isolation loss.The signal must pass through eachof the feed -through impedances butonly one isolation impedance to getto any TV set along the line.

We must consult manufacturers'specifications to find the lossescaused by each of these impedances.For ex ample, a typical splittercauses a feed -through loss of 1.0 dband an isolation loss of 11.5 db (atchannel 13). To get to the last TVset in the line, we must go throughfive feed -through losses, but onlyone isolation loss. Remember, we

multiply the feed -through losses bythe number of tap -offs in the line,but we only count the isolationloss once.

Cable, of course, also causeslosses. For instance, let's say asystem uses 200 ft. of RG-59/Ucable between the head -end andthe last TV set on the line. At chan-nel 13 (losses are always computedat the highest channel in the system)RG-59/U loses about 5.9 db per100 ft. For simplicity and addedtolerance, we generally say 6 dbper 100 ft.

Total distribution system losses,then, can be compared as follows:

A 2 -way splitter 3.5 db; an 8 -way splitter 10 db; tap -off feed -through losses (5 x 1.0 db) is 5 db;tap -off isolation loss 11.5 db; cablelosses 12 db; which gives a totalloss of 42 db.

This calculation tells us whatwe require of our head -end. Wemust choose an amplifier with anoutput capability of at least 42 dbj.

For the sake of simplicity, let'sassume that all channels come fromthe same direction and at aboutequal strength - 6 dbj, or 2000iLv. We would then need a head -end amplifier with a gain of at least36 db.

Typical available amplifiers canhandle these requirements easily.As explained previously, weakchannels would require preamplifi-cation and interference would callfor filters or a trap.

You can make money in masterdistribtution systems if you keep inmind the following guide -lines:

1. Design your system carefullyand competitively. Never submita bid on a job without visting andsurveying the site carefully. To de-sign a good head -end, you must bethoroughly familiar with local sig-nal conditions. When in doubt, askthe equipment manufacturer forhelp.

2. Make accurate estimates. Toohigh an estimate can cost you thejob. Worse still, too low an esti-mate can cause you to lose moneyon a job.

3. Use good materials and installthe system carefully. Callbacks cancat up profits fast. And they don'timprove your reputation.

AUGUST 1965 47

How Multipath Signals

Every service -dealer and technician is thoroughlyfamiliar with TV "ghosts" that result from multipathreception of TV signals. Many are unaware, however,of the degrading effect of ghosts on FM/stereo signals.As we know, when two or more signals arrive at theantenna via different -length paths, additional imagesappear on the TV screen. But multipath reception ofFM/stereo signals produce very deceiving effects. Con-siderable distortion, frequently blamed on poor dis-criminator alignment or operation, is caused more oftenby multipath reflections. Improper discriminator tun-ing usually aggravates the situation.

Of course, multipath reception occurs on AM sig-nals too. But this takes place primarily as ionospheric"bounce" over long distances and is recognized as anecho. When the signals are received over relativelyshort distances, however, the difference in path lengthis usually so small that little echo is noted.

FM Fundamentals

To understand how multipath signals can distortFM/stereo signals, let's look at FM principles.

Fig. 1-Relationship between the modulatingsignal and the transmitter output frequency for

standard FM broadcast station.

High front -to -back ratio antennas and rotorsmay be necessary for quality

FM/stereo reception

When a transmitter carrier signal is frequency mod-ulated, the transmitter's output frequency deviates, orvaries, above and below the assigned carrier frequency,an amount proportional to the amplitude of the mod-ulating signal and at a rate equal to the modulatingfrequency. The relationship between the modulatingsignal and the transmitter output frequency for a stan-dard FM broadcast station is shown in Fig. 1. It isassumed that the transmitter's output frequency in-creases as the modulating signal goes positive, andgoes lower as the modulating signal goes negative.

This modulating polarity is arbitrary and in manytransmitters the phase relationship is just the opposite.Regardless of this phase relationship the output fre-quency changes at a rate which is exactly equal to thefrequency of the modulating signal.

Once again, the amount of carrier deviation de-pends on the modulating signal amplitude. We do nothave a modulation limit in FM as we do in AM. ForFM broadcast, the amount of deviation considered tobe 100 percent frequency modulation is established bythe Federal Communications Commission (FCC) and

CARRIER100 MC

100%MUDULATIONLIMIT

99 925 MC

LOWER FREQUENCY

100% MUDULATIONLIMIT

I00075MC

HIGHER FREQUENCY

I KC MODULATINGSIGNAL


Affect FM Reception6' Ro6'ezt 6.zeev

HILLSIDE ,TALL BUILDINGOR LARGE STEEL TANK

29 MILES

I 5 MILES

30 MILES

Fig. 2-How multipath signals occur.

is plus or minus 75 kc for FM broadcast, and 25 kcfor FM audio on TV stations.

Multipath DistortionAs we have seen, the output frequency of an FM

transmitter is constantly changing. If the signal fromthe transmitter to the receiver follows two paths of dif-ferent length, for instance, the direct -path signal willarrive at the receiving antenna slightly ahead of thereflected signal. In this example, the signal followingthe direct route will travel thirty miles. Part of thesignal travels twenty-nine miles to a high point andthen reflects another mile and a half to the receiver.Hence, it travels one-half mile farther than the directsignal (Fig. 2). Since radio waves travel approximately186,000 mps, we can calculate the time difference be-tween the two paths as follows:

5 x 10-11.86 x 105

= 2.688 x 106 2.688 sec time difference.

X =-. 0.968 deg.

If, for the purpose of illustration, we assume thetransmitter is modulated by a 1 kc sinewave, we candetermine how much change takes place in the trans-mitter frequency in 2.688 psec. This is shown in Fig. 3.

Each cycle of a 1000 cps sinewave would last1/1000 of a second which is equal to 1000 /sec. Asshown in Fig. 3, time intervals in sec are shown alongthe top of the reference line and degrees of the cyclealong the bottom.

We can now determine how many degrees of thecycle would elapse in 2.688 psec. This may be calcu-lated by using ratio and proportion as follows:

1000 2.688360 XIf we now find the sine of 0.968 deg we can deter-

mine what percentage the modulating voltage wouldchange in this interval. Sin 0.968 deg = 0.0168 =1.68 percent of the peak value.

Thus, if the peak value of the modulating voltageproduces a 75 kc deviation in 2.688 I./sec, the transmit -

AUGUST 196549

ter frequency will change 1.68 percent of 75 kc or1.26 kc.

At a time when the signal arriving via the reflectedpath is passing through the carrier frequency the directsignal, being ahead 2.688 tam, will be 1.26 kc differentin frequency. These two signals will interfere witheach other and produce a 1.26 kc beat frequency.

During other portions of the modulation wave-shape the beat frequency produced will be different.For instance, if we look at a time near the peak of themodulating signal the voltage is changing more slowlyand in 2.688 /zee less change in frequency would oc-cur.

In fact, there will be two times, one near the posi-tive peak and one near the negative peak, when the di-rect and reflected signals will arrive at the same fre-quency. The beat frequency produced will vary be-tween zero and 1.26 kc as the rate of voltage changevaries.

If the direct and reflected signals arrive at the re-ceiving antenna at the same signal strength, the result-ing antenna signal will vary in amplitude from zeroto twice the strength of either signal at the rate of thebeat frequency. This will make it impossible for thelimiter in the FM receiver to eliminate this amplitudevariation from the output. And this has even moreominous overtones for FM/stereo reception.

The values used in this example are arbitrary andare only valid for the conditions we have set up. Itcan be seen that the interfering frequency may be al-most anything depending upon the comparative lengthsof the direct and reflected paths, the modulating fre-

Fig. 3-The period of a 1 kc sinewave is 1/1000 sec or 1000 asec. Anarea of 0.968 deg is covered in 2.688'<sec.

quency, the modulating waveshape, and the amountof frequency deviation.

Reducing Multipath DistortionThe cure for multipath distortion is the same as

that for the elimination of 'IV ghosts. Anything whichcan be done to improve the ratio between the ampli-tudes of the direct and reflected signals will decreasethe beat interference.

A more directive receiving antenna, one with a highfront -to -back ratio and narrow frontal lobe, will usuallybring desired results. In some cases a reorientation ofan existing new antenna installation may solve theproblem. In many large urban areas, near- and deep-fringe areas, however, a rotator may be required for"micrometer" orientation of the antenna to compensatefor changing propagation conditions. Also, simplychanging the height or position of the antenna willsometimes change the relative strength of the two sig-nals and may possibly alleviate or even eliminate thetrouble.

In some extreme cases it may be desirable to orientthe antenna toward the reflected signal rather thantoward the direct one. The objective is to receive onlyone signal of adequate strength and it is not uncommonto find a stronger reflected signal than a direct signalin some locations.

No FM/stereo system is completely immune tomultipath distortion. But careful selection of the prop-er antenna and necessary accessories for a particularlocation will generally provide the best possible recep-tion for your customers.

TI

0

FREQUENCY 1000 CPSI T2= 2.688p SEC

1

2501PSEC1

500 750P SEC P SEC

0.968°

90° 180° 270°

I CYCLE1

SEC1000

1000SEC

360°


COLOR BAR/DOTGENERATORS

B & K Model 1240Color GeneratorFunctions, controls, signalsand circuit description

This 11 tube unit generates a keyed rainbow pattern.The generator measures 121/4 x 4% x 101/4 in. andweighs 9 lb. The offset subcarrier method is employedand the output contains ten gated color bars. The tenbars are spaced at 30 deg intervals. The signal withhorizontal sync pulses added is available for feedinginto a color TV set. The RF output for the instrumentis factory aligned for channel three but it can be re-tuned to channel 4 or 5 by adjusting the RF coil. Thiswill enable you to select another channel if channel 3is being used in your area.

A color amplitude control sets the level of thecolor subcarrier and can be used in checking the synccapabilities of a color receiver. The modulation levelcan be varied from zero to 200 percent. TheON/OFF switch is attached to this control.

B & K Model 1240 Color Generator

Besides the ten bar color pattern the instrumentprovides patterns necessary for converging a color TVset: dot pattern, crosshatch, horizontal and verticallines. The horizontal lines are one scanning line inheight. There are 10 vertical lines and 14 horizontallines.

Circuit FunctionsThe block diagram shown in Fig. 1 indicates func-

tions of the instruments' various stages. A frequencydivider chain begins with a 189 kc crystal controlledoscillator (V1). V2, a 6CG7, is a 31.5 kc multivibra-tor which is synchronized by pulses from 189 kc oscil-lator.

The 189 kc oscillator is also used to form thevertical lines when the pattern switch is in the dot

AUGUST 196551

MOP

1111111111111

Inside view of printed board sections of 1240 color generator. Photographed in ET's laboratory.

169 KCXTAL05C

VERTICALLINES

V-231.5 KCMV

V-815.75 KCMV

V-3.5 KCMV

v-7450v CYCLEMV

180 CYCLEAC/

J- 4900 CYMV M.

HORIZONTAL_LINES

PATTERNSWITCH

1/2 V-9XTALCOLOROSC

2 v-9

AMP

1/2 V-10VIDEOAMP

1/2 V-10MODULATOR

RFOSC

F OUTPUT

52


(AS VICTIM IRMOPROM.)

5-20

L

C-101

TOCro

'Pow

14-303

" -204".-PTS 5-p09 " c

2-20

Schematic of B & K Model 1240 Color Generator

10

(204970

C-314

20%

crosshatch or vertical lines position. The 189 kc signalis also used to form white bars which, when mixed withcolor, form color bars. Output from the 31.5 kc multi -vibrator is used to synchronize both the 15.75 kc multi -vibrator and a 4.5 kc multivibrator.

The output of the 15.75 kc multivibrator is usedto phase -lock the 450 cps multivibrator and it is alsoused as the horizontal sync pulse. The 4.5 kc stage isused as a buffer between the 31.5 kc multivibrator andthe 900 cps multivibrator. Stability is obtained bydividing the frequencies in smaller steps. A pulse fromthe 900 cps multivibrator locks the 180 cps multivibra-tor and the output of the 900 cps stage is also used tosynchronize the 450 cps multivibrator. Alternate fieldsare scanned with the 450 cps so single-line thickness ofthe horizontal sweep is achieved. The 180 cps stagelocks the 60 cps multivibrator and the 60 cps stage out-put is used as the vertical sync portion of the signal.

One-half of V9, 12AT7, (Fig. 2) is used as a crys-tal oscillator to generate the 3.56 Mc offset subcarrierfrequency. It operates only when the switch is in the

AUGUST 1965

R-211 R

3S0

7.90

BOARD 910 2

zn

7L

MEM11-1 v-2 V- v- v -S -a M1 0-1

R- T93

IA ISMAC -I40

ZPI

24°""- 20%00Sov

9

V-10 V -II

1

C.. 0

I-301Ami

117vAC.60-00OPS

uPLESs OTRCRwisc svccirKDRESISTORS INIPCATEDOC ARC CEPOSITED CARSONALL RESISTORS 'BO 00%.

ALL CAPACITORS IN PI

CAPACITORS MOICATED -SS" ARC SILVER MICA.

color position. Its output is then fed to the 2nd videoamplifier, the other half of V9. Keying of the colorbars also takes place in this stage.

V11 (6C4), the RF oscillator is on at all times andit feeds a signal to the modulator one-half of V10(12AT7) and this signal is then modulated by the in-formation selected by the pattern switch. Horizontaland vertical line information, when selected, is passedthrough two stages of video amplification before beingapplied to the modulator.

The circuits are divided into two sections, the fre-quency dividers form one and the RF oscillator, coloroscillator, modulator and video amplifiers are includedin the second section. These circuits are mounted onseparate printed boards. The long printed section con-tains the counter circuits (Fig. 3) and the smaller sec-tion houses the other circuitry.

Voltage test points for adjusting the count circuitare conveniently located along the bottom of the coun-ter board. The counter potentiometers are located atthe top rear of the counter board.

0%

Color, Color Everywhere

Fig. 1-Bob pulled out a sketch pad andbegan to sketch a schematic.

Part II (conclusion)foe cz.efect

Scoot rushed in the shop puffing - about half anhour late for work and Bob looked at him inquisitively.

"I overslept," Scoot finally volunteered as hemoved toward the coffee pot, "it must be these springmornings we've been having. It sure is hard to get up- Hey, there's no coffee yet!"

"Scoot, you know we don't make coffee this earlyin the morning. What's wrong, were you up too latelast night night?"

"No I wasn't up too late last night," Scoot shotback disgustedly, "I rushed down here so I wouldn'tbe too late and I didn't have coffee before I left home."

"Big deal," Bob said jokingly, "get to work.""Have a heart Bob. Let's go next door and have

some coffee. I've got a couple of questions to ask youabout that burst business you gave me last week."

They both moved to the door without a word."What's the trouble, Scoot?""Well, it's not a crisis, Bob, but when you were tell-

ing me about the origin of the burst and its processing

BURSTAMP

R1 Z

PULSE

KILLERAMP

KILLERCONTROL

TO COLORAMPS

r PHASE DET

1 1

KILLER DET

FROM3.58 MCOSC

ACC VOLTAGE TO

COLOR AMP GRID


But Not a Bit in SyncScoot follows the burst signal through the

color section and Bob discusses AGC

it never dawned on me then but you never told me howthe burst is ultimately used."

"I was wondering why you didn't ask me aboutthat at the time."

"I guess I was too busy digesting the phase detec-tor, killer and that stuff."

The boys worked their way into a booth at the farcorner of the diner.

"Well? How about it, Bob?""All right, you remember where we left off - at

the output of the burst and gate amplifier; now let'strace the path of the burst signal and see what it does."

Bob pulled out a sketch pad and began to sketcha schematic (Fig. 1).

"Remember the output at the burst gate amplifieris a burst only a few cycles at 3.58 Mc and the phaserelationship is quite exacting.

"As you can see here, the burst amplifier output isfed through a transformer. The transformer is center -tapped so a signal can be taken from both the remain-

ing ends. Now, Scoot, a little fundamental knowledge.What can we say about the signal relationship fromeither end of the transformer?"

"That's easy enough-they're out of phase by 180degrees."

"Right. Actually, here's what they would look likeif you could see them both on a dual trace scope."

Bob sketched the 3.58 burst signal one above theother carefully drawing each cycle so that it was half acycle out of phase with the other. (See Fig. 2.)

"What's the reason behind that, Bob?""Well, the only good reason I can think of is to get

two signals so they can be used in a phase detectorarrangement and to match the impedence. As youknow a phase detector can work from in -phase as wellas from out -of -phase signals.

"Now, here's the way the burst is used."Bob continued sketching and drew lines to the

phase detector, and the killer detector (Fig. 2). Next,he drew in two blocks and labeled them "3.58 osc."

(a'

BURSTAMP

B+

PHASE DET0

Fig. 2-'That's easy enough-they're out ofphase by 180 degrees.'

AUGUST 196555

and "REACT. CONTROL." He connected these to thephase detector.

"See how they are connected, Scoot? They are allin a circular configuration-that should remind you offeedback-and that's how the oscillator keeps in perfectsync. The burst signal comes into the phase detectorand is compared with the oscillator signal. If the signalis off in phase or frequency-the result is the same-a voltage output from the phase detector is fed to thereactance control tube.

"The reactance control tube, in turn, adjusts thefrequency of the 3.58 Mc oscillator. So, you see, the3.58 Mc oscillator is always in sync, so to speak, withthe burst signal. And the oscillator is only syncedduring blanking. The rest of the time the oscillator`runs' on its own but at the beginning of each sweep-during the horizontal blanking-the oscillator is againphased."

"Hunh . .," Scoot grunted, "OK, now how aboutthe killer detector you've got drawn in here-how doesa phase detector have anything to do with that?"

"Well, the killer is used to turn off the color ampli-fiers when no color signal is present. If there's no colorsignal, then no burst is transmitted with the signal.And, if no burst is transmitted, the signal from theoscillator is rectified and the detector goes more posi-tive, or less negative depending on the circuit, and thekiller amplifier is allowed to conduct. You see, up tothis point the killer amplifier has been shut off. Andwhen the killer amplifier is not conducting the highvoltage pulse from the flyback charges this capacitor."

Bob ripped off the first sheet from his scratch padand started a new one showing the killer circuitry (Fig.3).

BURSTAMP

Fig. 3-Bob ripped off the first sheetfrom his scratch pad and started a new

one showing the killer circuitry.

TO DEMODS

"When the killer amplifier tube is conducting, be-cause a color signal is present, the capacitor is dis-charged and is not allowed to bias off the coloramplifiers."

"It's simpler than it looks, I guess," Scoot com-mented, "is that all there is to it?"

"That's it. Now let's get back to work.""No-I mean-well, wait a minute. I haven't fin-

ished my coffee. How about that automatic colorcontrol that a couple of manufacturers are using. Howdoes that work?"

"Oh, boy! You'd listen all day to get out of a littlework wouldn't you? Well, only because it is fairlysimple and in the same general area we've been dis-cussing, I'll go through it.

"Everywhere I've run into this circuit it's beencalled ACC for AUTOMATIC COLOR CONTROL. The pur-pose of the circuit is to automatically control the gainof the color amplifier. Basically, the system acts like anAGC circuit except that it is applied to the color ampli-fiers instead of the tuner and IF."

"Well, doesn't the AGC take care of signal varia-tions-why do we need another correction circuit?"

"I suppose it seems like the AGC circuit shouldtake care of the job, Scoot, but it doesn't do the jobwell enough, so the ACC circuit has been added by afew manufacturers. At least one of the manufacturersclaims that the ACC circuit makes the color adjustmentand fine tuning less critical. It does seem to help. Andit also helps the color remain more constant when itvaries because of airplanes passing overhead, and so on.

"Now that you have an idea, do you know how itworks?"

"Well, I assume that we need a bias voltage thatvaries proportionately with the strength of the colorsignal. And, since you said it was in the same area asthe killer detector circuit, it must come out of theresomehow."

"Scoot, the killer detector voltage varies with theburst amplitude. And the burst signal is proportionateto the amplitude of the color information. All of thecircuits being used at present take the same voltageused for the killer and apply it directly to the grid of thecolor amplifier."

"On the sets I've seen with ACC, Bob, there isalways an extra tube in the set. How does that get intothe act; does it have something to do with the ACC oris that something else?"

"No, that's all a part of the same circuit. You see,anytime you try to change the gain of an amplifier bothup and down then you need more latitude to accomplishit. So the extra amplifier is used to increase the over-allgain so it can be effectively lowered when the signal isincreased. See?"

"Sure. Darn, Bob, I'm really soaking it up thismorning-maybe you should tell me about some of theother new circuits now being used. I'm sure it wouldhelp my efficiency in the shop and . . ."

"No you don't, Scoot. We've got plenty of equip-ment for you to get more practical 'cur from nextdoor. Let's go!"


Combination VONIZMTVMs

Both the VTVM and VOM areindispensable tools for TV -radio, HiFi and two-way communicationsservice work. A VTVM is necessaryfor checking voltages in high imped-ance circuits and simplifies the read-ing of P -P voltages. Current meas-urements cannot be made with aVTVM so in this instance a VOMbecomes a necessity. Therefore, anideal instrument, especially for in -home servicing, would be a unitwhich combines the functions ofboth in one compact housing. Com-bination meters of this type areavailable from several manufactur-ers.

The proper application of a com-bination instrument of this type canwiden the scope of service work per-formed in the home. You get theconvenience and ruggedness of aVOM plus the advantages of aVTVM for important circuit meas-urements which would be unreliableon a VOM.

Triplett Model 631The Triplett Model 631 is a port-

able, battery -operated combinationVOM and VTVM. It is basically a20,000 SO, VOM with VTVM sec-tion used for measuring dc voltage.It does not need an external sourceof power as it contains its own bat-tery supply. The VTVM section usesa 1R5 tube and has an input imped-ance of 11 M. Four voltage scalesare in the VTVM portion -0-1.2,0-6, 0-3, and 0-120 vdc. A switch onthe front of the meter selects eitherthe VOM or VTVM function. Andas the VTVM operates on the self-contained battery supply, the switchshould always be left in the VOMposition when the unit is not beingused as a VTVM. The condition ofthe batteries can be checked withoutremoving the case.

AUGUST 1965

The VOM section has five dcvoltage scales ranging from 0-3 to0-1200 vdc. The sensitivity of thedc voltage scales is 20,000 n/v.There are five ac (rms) voltagescales with a sensitivity of 500012/vand coverage from 0 to 1200 vac.The unit has dcma scales of 0-.060,0-1.2, 0-120 and 0-1200 and also a0-12 amp provision. Zero to 150 M,in four scales, can be measured onthe ohms section. Also included isa provision for measuring audiofrequency output with the meterreading directly in db.

Sencore Model SM112The Sencore Model SM112 con-

tains both a complete VOM and acomplete VTVM in one portablesteel case. The VTVM section con-tains two tubes and is 117 vac pow-ered. The unit will keep the tubeswarm whenever it is plugged in,even if the function switch is in theVOM position. This enables techni-cians to change from VOM toVTVM operation without delay.

The VTVM section has an inputimpedance of 10 M and has 6 dcvranges from 0 to 1000 vdc. It alsocontains rms acv coverage from 0to 1000 v in six steps. The unit iscalibrated for direct reading of P -Pvoltages. The P -P scales are 0-8.4,0-28, 0-84, 0-280, 0-480 and0-2800 P -P v. The VTVM ohmmet-er can measure resistance from 0 to1000 M in six ranges.

The VOM portion has six dcvranges: 0-3, 0-10, 0-30, 0-100,0-300 and 0-1000 with a sensitivityof 5000 n/v. The ac voltage scalesare divided in the same manner asthe dc and have a sensitivity of 5000/v. The ohmmeter section has tworanges available 0-10,000 12 and 0to 1M. Provision is made for meas-uring from 0-1000 ma.

Handy integratedportable instrumentsare adapted to inhouse and shopservicing too

Sencore Model SM112

Triplett Model 631

57

FM /Stereo Servicing

L + R SIGNAL L -R S IDEBANDSPILOT

6 'Mc.,fiew cza4ett

SCASUBCARRIER

I5KC 23KC 38KC0 I9KC

Don't let FM/stereo scare you.It's different, sure - but not thatdifferent. Like the color TV set,there are a few extra circuits. Un-like color, it's simpler. And, al-though a stereo generator is indis-pensable for certain jobs, you canservice most sets with a VTVM andscope.

Common TroublesMost FM/stereo troubles are

caused by faulty tubes, weak stationsignals or poor antennas. Tubetroubles aren't difficult, for thereare seldom more than three or fourtubes in the multiplex section. Weaksignals cause distortion and lack ofseparation, and are usually causedby improper antenna installations.Some salesmen push FM stereo andoften neglect to point out that line-cord or back -of -the -set antennaswon't give good reception in manylocations. A rule of thumb to followis: If a good outdoor antenna isneeded for color, they'll need onefor FM/stereo. Some packagestereo receivers have a gain control(also called AGC or fringe control)which is preset at the factory foraverage signal strength. Customersliving in fringe areas will requirereadjustment of this control to ob-tain maximum possible gain andbest separation.

53KC67 KC

The frequency spectrum of modulation used for transmitting FM/

An FM/stereo receiver can bechecked in mono to cover RF, IF,detector and power -supply troubles.There must be sufficient gain andbandwidth in the IF, and the detec-tor must be working on the linearportion of its curve for stereo toget through. A large share of thetroubles are caused by the multiplexcircuitry. Most pure stereo troublecan be detected by ear. Insufficientseparation or a fluttering 400 -cpstone during a stereo program usuallymeans that the local 38-kc oscilla-tor needs realignment. Whistles in-dicate interference from the SCA(background -music) channel trans-mitted by some stations.

Basic CircuitryThe block diagram in Fig. 1

shows the type of circuitry employedin some of the earlier multiplex re-ceivers. The composite signal fromthe FM detector output consisting ofthe L -ER component, the L-R dif-ference signal and the 19 kc pilotsignal, is fed to the input amplifiergrid. After amplification, the signalis channeled in two directions: theLd-R component (50 to 15,000 cps)goes through a lowpass filter and theL-R component (23 to 53 kc) isfed through a bandpass filter. The19 kc pilot is separated from thecomposite signal bandpass and then

fed to the grid of a locked oscillatorwhere the signal is doubled to 38 kc.It is then coupled to a balanced de-tector where the 38 kc differencesignals are demodulated.

Diode DI responds only to theL-R portion of the sidebands whileD2 responds to the -(L-R) phaseof the difference signal. The detec-tor outputs are then applied to amatrix network along with the L+Rcomponent. The final result is thatonly an L signal appears at the Loutput and only an R signal is foundat the R output. The L -FR com-ponent is passed through a delay linebefore it is applied to the matrix. Inpassing through additional circuitrythe L-R portion of the signal isdelayed somewhat. The L -ER com-ponent must be delayed the sameamount to obtain true reproductionof the transmitted signal. A de-em-phasis network flattens the audioresponse of each output.

More recent FM/Stereo receiversuse a circuit similar to the oneshown in Fig. 2. The compositesignal from the FM detector is fedthrough a composite amplifier to a53 kc lowpass filter. This filter al-lows the L-R and the 19kc pilot signal to pass and blocksany SCA signals that may be present.The 19 kc pilot signal is then re-moved and used to sync the 19 kc


PrinciplesAlign and troubleshoot this equipmentwith or without a multiplex generator

76KCXTALOSC

r67IKC-

aKC

PULSESHAPER

19 KCOSC

0TO L RGATES

METER

38 KCMV

MTRAMP

EMITTERFOL

HLGATE

-41:ATE

0.0.O 3vO 30r

OUTAMP

67 KC OUT

COIN OUT.

EMITTERFO._

II4 KCFILTER

REACTMOO

RFOSC

RF OUTPUT

Block diagram of an FM/stereo multiplex generator.

Fig. 1-An FM/stereo circuit employing a matrix and a balanced demodulator.

COMPSIGNALFROM

FMDET

VIINPUTAMP

LOW-PASS FILTERf

Ifs 1_ I

L I --r I

---I-.

BANDPASS FILTER-7

I _4 yIL2 I L -R

DELAY

1

1L-1(-_,1TRAP67-kc

19 kc'PILOT COIL

V4LOCAL

OSC

L

i'38 kcOSC COIL

DI

D2

L-+ R

MATRIX

L OUT

DE-EMP NETS

R OUT

AUGUST 196559

... FM/STEREO

local oscillator. The output of theoscillator is doubled and fed to theunbalanced demodulator. The 38kc signal applied to the anode ofD1 is 180 deg out of phase with thedoubler voltage at the anode of D2.

The composite signal, less the 19kc pilot is fed to the center tap ofthe secondary of T 1 . Both the L+Rcomponent and the L-R sidebandsare present at this point. Both D1and D2 rectify the positive portionof the L -FR signal so the L -FR volt-age appears across each diode loadat all times. As the 38 kc signal isapplied to the diodes 180 deg outof phase, +(L-R) will appearacross the D1 load and -(L-R)will be present at the D2 load. Whenthe L-R signal present at the out-put of DI is added to the L+Rcomponent the R voltages cancel soonly the L portion remains. The-(L-R) signal at the output of D2will combine with the L -FR presentand the output will be only the Rsignal. The L and R signals are thenamplified again and fed to a stereospeaker system.

Getting the Job DoneA great many FM/stereo repair

jobs can be completed without agenerator. Most of the jobs involv-ing parts substitution require only a

touching up of the separation con-trol. Where replacement or repairof tuned circuits are involved, how-ever, or the receiver is obviously outof alignment, a stereo generator willbe required.

If a generator is not available afair job of alignment can be doneby using station signals. Stereo re-ceivers which have 19-kc local os-cillators are easiest, because thisoscillator can be locked to the in-coming 19 kc pilot and tuned cir-cuits peaked to it. Some stereos,however, have no local oscillator,and amplify the incoming 19 kcpilot. In these cases, you may haveto borrow 19 kc from anotherknown -to -be -good stereo receiver.You can pick it off the 19 kc oscilla-tor output and couple it through a0.001 td capacitor into the 19 kcinput of the set to be aligned.

Alignment is simple if you re-member only two frequencies are in-volved - and the second is a har-monic of the first. As a tuning in-dicator, use either a scope or aVTVM across the diodes. The scopewill show the 38 kc waveform, whilethe voltmeter will read the signalamplitude. In either case, you tunein a station transmitting stereo andpeak -tune each coil for maximumamplitude.

Fig. 2-A typical FM/stereo circuitusing an unbalanced demodulator.

COMP SIGNALFROM

LOW PASSFILTER L.13

COMPCOMPFM DET

(-11A4LI _LIAMP

V219 kcAMP

V319 kc

OSC19 kc

COIL

V438 kc

DOUBLER- -

DI

D2

OUTPUT L OUTAMP

OUTPUT R OUTAMP

Phasing CheeksThe next step is to check for 19-

kc oscillator phasing (where used).An out -of -phase condition will prod-uce a low -frequency motorboatingin the audio, with loss of separationand possibly distortion. Although it'spossible to phase -lock the oscillatorby listening critically for maximumseparation and no motorboating, it'smuch easier with a scope across thediodes. Referring to Fig. 3, if thewaveform is fuzzy, the oscillator isout of phase. It's in phase when thetrace is sharp and clean. In matrix-type receivers, the bandpass filtercan be peaked for maximum separa-tion by ear. The same is true of thelow-pass filters.

The aforementioned methods willget you through most service jobs.Expensive receivers and critical cus-tomers, however, will sometimes de-mand more precise alignment forminimum distortion. So if you do asubstantial amount of multiplexwork, an investment in a stereo gen-erator would be advisable. Mostgenerators provide composite stereoand 19 kc pilot outputs, which arethe most used signals in alignment.

Adjustments at 19, 38, and 67 kcmay be made easily by killing allbut the desired oscillator in thestereo generator and making theproper alignment. Generators whichhave a phase adjustable 19 kc crys-tal oscillator permit precise phasingwith station signals. You can cross -beat them, using a receiver as areadout indicator, as described forsyncing the local oscillator.

Fig. 3 (A)-Fuzzy 38 kc indicates thatlocal oscillator is not synced. (B)-

Sharp 38 kc trace showsthat oscillator is in sync.

pAAAA A Alvbv


Iron designed for printed board work 'sucks'up solder with bulb. Iron made by

Air -Vac Engineering Co.

Wen fine point tip soldering pistolis used on PC board.

Miniature soldering iron by American Beauty.

Soldering Tips for Today

Intelligent, careful selection and

application of soldering equipment is

essential to efficient shop operation

4 eactzad Zazaeg

That familiar saying, "A chainis only as strong as its weakest link"is assuming critical importance toelectronics technicians today!

Why? Simply because our workdeals almost entirely with electronicchains of components in which sold-er joints are important links, andit takes only one bad solder jointout of perhaps thousands in onepiece of electronic equipment toput the entire unit out of commis-sion. Yet, far too many of our col-leagues don't realize the importanceof good soldering equipment, ma-terials and techniques.

What is Solder?We know that most solder (the

kind we ordinarily use, anyway) ismade of lead and tin. Most peoplebelieve that the higher the tin con-tent the higher the melting pointof the solder, but this is not neces-

sarily true-it depends on whereyou start.

The melting point of pure lead isabout 620°F, whereas pure tin'smelting point is about 460°F. Start-ing from no tin at all (100 percentlead), as the amount of tin is in-creased, the melting point of thesolder decreases, reaching a mini-mum of 361°F when the solder is

about 62 percent tin. Above 62percent tin, the solder's meltingpoint rises again. The relationshipbetween tin content and the solder'smelting point is shown in Fig. 1.

Once a joint has been soldered,it makes no practical difference,electrically speaking, what the tin -to -lead ratio of solder is, but thisdoes not mean that the ratio is un-important-because it is. We knowthat heat is deadly to electroniccomponents and that it doesn't taketoo much heat to destroy some ofthem. (We are all too familiar withthe consequences of too much heatwhen working on printed circuitboards.) Generally speaking, mostelectronic components undergo thegreatest thermal stress they will everencounter at the time they aresoldered into place; therefore, itonly makes sense to subject com-ponents to as little heat as possiblewhen installing them.

The ideal solder, therefore, is one

AUGUST 196561

Oryx microcircuit soldering instrumentwith magnifying 'loupe'.

that is 62 percent tin, because thissolder has the lowest melting pointpossible. The melting point of the60:40 mixture commonly availableis only about 4°F higher than thatof the "ideal" 62:38 mixture. Ofcourse, tin costs more than lead,which is why the 60:40 mixturesalmost always cost more than the50:50 or even 40:60 mixtures thatcan be purchased; but the morerapid melting and the reducedchances of PC board damage, coldsolder joints and resulting callbacksand unhappy customers are wellworth the small difference in cost.

A well -stocked supply house maystock solder in a number of differ-ent diameters, but, in general, thesolder with the smallest diameter(within reason) is the one to use.We say "within reason" because youcan buy a solder so small that itmight take 6 in. of it to solder one1/2-w resistor into place. This wouldbe both ridiculous and unnecessary,but since we must keep componenttemperatures as low as possible, itshould be remembered that thelarger the diameter of the solderthe more heat it will drain awayfrom the iron and the work. Andthis means that more time will berequired for the joint to reach thesolder's melting temperature, givingthe heat more time to work its wayup the component leads into thecomponent.

Both acid- and rosin -core soldersare available, along with a wide va-riety of fluxes in the form of pastesand liquids. Only rosin -core soldershould be used on electronic equip-ment, however, because acid fluxestend to form electrically conductivepaths across tube sockets, switchcontacts, etc., and can gradually eataway wires and components. Evenpaste and liquid fluxes can in time

Tip that doublesfor solderingaid.

Tip that facilitatesremoval of multipleterminal components

Tip that providesfor tube socketremoval.

Ungar de -soldering iron.

become somewhat corrosive andconductive. This is why many elec-tronic kit manufacturers will noteven attempt to repair kits con-structed with acid -core solder orliquid or paste -tube flux.

Irons, Guns and PencilsNot too long ago, technicians

could choose from a wide varietyof soldering irons - but only irons.Today, however, we are offered analmost infinite combination of irons,guns, pencils, tips and accessories.But bewildering though the diversityof choice may be, most of the newdevices were created to satisfy themany present-day needs that didnot exist 20 years ago.

PC boards are only one impor-tant example of a new set of needsthat soldering equipment has hadto cope with. It's possible, ofcourse, to work on some PC boardswith the heavyweight guns andirons, but even assuming a techni-cian has the skill (and luck) nec-essary to safely solder PC connec-tions with the high heat monstors,such a mismatch of tool and job isextremely time -wasting. It takesonly a few jobs to more than payfor the smaller pencil irons thatare made especially for PC boardwork.

\Penciltypesolderingiron

Soldering aid.

To remove transformer, freeterminals individually fromPrinted wiring

How to remove PC board transformer.

By the same token, it is equallyunwise to attempt to use solderingpencils or lightweight irons or gunson heavier work - the lower theheat -producing capacity of the heatsource the more time is available forheat to work its way up the wireleads into the components; andirons or guns with marginal heatcapacity for the work also tend topromote rosin and cold -solderjoints.

The average -size service shopprobably could put to good use ahalf -dozen or more different com-binations of guns, tips, irons andpencils; however, in most cases onegun and one pencil should be ade-quate. The gun should be rated atabout 200 w or more and prefer-ably be of the two -heat variety. Al-most any soldering pencil in therange of 30 to 60 w is adequate- the lower wattages are generallyfavored when PC work is frequent-ly encountered.

Techniques

We won't slog through the fun-damentals of soldering ordinarytube -type circuitry here, becausemost everybody knows them (orought to!) pretty well by now. ButPC board soldering is somethingelse again. When soldering and de-


Soldering in a filter capacitor with a heavyWeller gun.

soldering printed circuitry, it's nec-essary to think not only about thesolder joints themselves but aboutthe components, the conductivestrips and the board too.

The more modern approach tothis problem, however, calls for us-ing a special spiral connector witha copperweld inner core, a layerof flux and outer jacket of solder.These devices can be employed forrapid, one -handed soldering (seeFig. 3).

The most common solderingproblem as far as PC boards areconcerned is removing and replac-ing components. Components aremounted to PC boards in two ways:double ended, where the compon-ents are placed flat against or par-allel to the circuit board and theleads come out both ends of thecomponents; and single -ended,where the component is "stood upon one end," so to speak, and bothleads come out of the componentat the end toward the PC board.Each type requires a little differentsoldering technique.

In replacing double -ended com-ponents (Fig. 2), the componentleads should be clipped as close tothe component as possible - if theleads are exceptionally short, cutthe component in half so as to use

POI

40.1 GYM

SOO

SMOOT SOO

00/41111,

OM,Si

011SOO

TO NI ON StO111141 . PCS

Looping

Fig. 1 - Relationshipbetween tin contentand -he solcer's melt-ing point.

Fig. 2-When leads are sho-tcrush component and use

internal leads.

Fig. 3-Steps A,B and C showhow spiral QUIGSare Jsed in sold-ering. This solder-ing aid is maau-factLred by Spra-gue.

the lead length inside the compon-ent's body. This way you can solderthe replacement component to theold leads and not have to removethe old leads from the PC boardand resolder to the board again.

To remove double ended com-ponents without cutting their leads(for example, when you don't knowwhether the component is bad ornot), place a small -tip solderingiron on the end of the lead solderedto the printed wiring and melt thesolder at the connection. Straightenthe lead with a soldering aid, re-move the iron and pull the lead outfrom its mounting hole while thesolder is still melted.

Single -ended components can bedesoldered easily if the proper toolsare available, but it can really befrustrating without them. One ofthe most vexing problems encoun-tered in desoldering componentsfrom PC boards is getting rid ofthe solder that is melted from thejoint. You can drain the solder awayfrom the joint by gravity if the jointcan be positioned higher than thesoldering iron, because the moltensolder will run back onto the hottip. But in most cases, of course,this is not possible; however, arather unique hand-held desolder-ing aid is available which will suck

up the molten solder when a smallrubber bulb is squeezed and the tipof the device is inserted into thesolder puddle.

Another problem that is just asbothersome is getting all the com-ponent leads to the solder's meltingtemperature at the same time. Un-less only two leads are involved,with an ordinary gun or iron bythe time you get the third joint hotenough to melt the solder, the firstjoint you heated up generally hascooled and resolidified again. If youattempt to overheat the first jointsso that they will stay melted longenough to desolder the rest of them,the high heat may severely damagethe PC board.

Soldering equipment makers havecome to the rescue here, too, how-ever, and now you can buy tips forsoldering irons and guns that areshaped so that all the connectionsof couplates, tube sockets, trans-formers, etc. can be heated evenlyat the same time.

Another problem common to PCboards is the repair or replacementof lengths of the printed conductors.Short breaks can be repaired simplyby soldering a short piece of barewire across the break. On longerbreaks, leave the insulation on thewire except where it is soldered.

AUGUST 1965

Linn' COLORFAXZenith Announces 1966 Line

Zenith Sales Corporation announcesits 1966 color television line, intro-ducing a $349.95 table model, and atotal of eleven different color sets un-der $500. There are a total of seven-teen 21 -in. models.

Twelve 25 -in. rectangular screen re-ceivers starting at a price of $625, areintroduced.

Philco 1966 SetsPhilco Corporation introduced 27

color TV models for 1966. The man-ufacturer introduced color TV receiv-ers in three screen sizes: 19, 21 and

25 in. The 19 and 25s are 90 deg rec-tangular types. The 27 color TV mod-els are spotlighted by the 19 in. porta-ble model 5300 WA. In addition tothis 19 in. model there are eight 25 in.models which contain solid state cir-cuitry. Both the VHF and UHF tunerand the 3 stage IF system are fullytransistorized. A selection of eighteen21 in. color sets are included in theline.

Admiral Master Screen ControlThree color TV chassis in the G1 1

series are introduced in the 1966 Ad-miral Television Line: 1G11, 2G11and 3G11. These are basically thesame as the G11. Chassis have a MAS-TER SCREEN control on the rear apronwhich changes the tracking procedureas follows:

The purpose of this adjustment isto obtain good B/W reproduction atthe normal useable range of CONTRAST& BRIGHTNESS controls.

To adjust, tune in a channel with aB/W telecast displaying an adequaterange of contrast levels, with both lightgray and black objects.

64

1. Set the COLOR FIDELITY and TINTcontrols to midrange and the COLORcontrol to minimum.

2. Turn the BRIGHTNESS control to90 percent of full rotation and theCONTRAST control to produce a normalpicture.

3. Turn the MASTER SCREEN Con-trol to 75 percent of full rotation.

4. Alternately adjust the BLUE, REDAND GREEN BACKGROUND controls toproduce a B/W picture with maximumbrightness but without blooming.

5. Check for B/ W picture at vari-OUS settings of BRIGHTNESS control. Ifpicture lacks detail at high brightnesslevels, increase MASTER SCREEN con-trol slightly; if retrace lines appear,reduce MASTER SCREEN controlslightly.

6. Reduce brightness to slightly be-low normal. If any one color is pre-dominant, reduce that backgroundcontrol slightly. If you cannot getproper tracking, proceed to step 7.

7. It may be necessary to relocatethe red, green or blue picture tubecathode wires on the pins provided ifa B/W raster cannot be obtained withthe BACKGROUND controls. The cathodewires are identified by the red, greenor blue tracer on a yellow wire. If onecolor is predominant, its cathode wireshould be connected to pin P (lowdrive). The other two wires should beconnected to either of the N (mediumdrive) or M (high drive) positionswhich gives the best B/W picture atall useable settings of the BRIGHTNESScontrol.

Sylvania Introduces 1966 TVsSylvania introduced its 1966 color

television line which includes four 19-in. portable models, a 25 -in. consoleseries, and a number of 21 -in. sets.Robert J. Theis, president of SylvaniaEntertainment Products Corp., said the19 -in. sets have rectangular picture

tubes manufactured by the company'selectronic tube division. The 19 -in.rectangular portable models provide180 sq in. of viewing area and areavailable in champagne, mahogany,walnut, and maple finishes and styledin Contemporary and Early American.Designated models 19TC11 and 19TC-12, the sets carry manufacturer's sug-gested list prices ranging from $399.50to $449.50.

Eleven 25 -in. color TV consoles areannounced. Twelve 21 -in. color TVconsoles also are introduced.

RCA ExpansionThe Radio Corporation of America

announces a $50 million outlay to in-crease production facilities for colortelevision receivers and picture tubes.The expansion program is designed tomore than double the company's colorTV set production capacity within twoyears and to double color tube outputwithin three years, W. Walter Watts,group executive vice president, said.

A total of $36.4 million will bespent to expand color TV picture tubefacilities, and $13.3 million will beused to expand color TV receiver fa-cilities, he reported. Watts predictedthat annual color receiver sales willgrow from more than 2.3 million setsin 1965 to well over 5 million sets by1970, at which time color will haveachieved at least a 40 percent satura-tion of the nation's television homes.He said color will account for 25 per-cent of all TV sets sold this year andthat the total dollar volume of colorset sales at the retail level in 1965 willexceed that of black -and -white for thefirst time ever - rising to a record$1.2 billion. Douglas Y. Smith, vicepresident, RCA Electronics Compon-ents and Devices, explained that the$36.4 million allocated for color tubeexpansion will be broken down thisway: $24.7 million to provide addedmanufacturing equipment and supportfacilities for color tube operations atMarion, Ind., including 264,000 sq ftof additional manufacturing and ware-housing space and $11.7 million toprovide added facilities as well as 23,-000 sq ft of new manufacturing spaceat the Lancaster, Pa., plant. He saidthe company is preparing for greatlyincreased production of rectangularcolor picture tubes during 1966.


oc.)E

.,

..-0LIN3

C o.-.0 -o.17 =

coT.

8 :.E-41 x04. CO

CO CT.ea CN1in

0 Rd' .1;

0 inin ...-- C..)fr cr al

aCa .0.-=Ctti tipZ 2 bE E.

..- -a:,22 0 3 E a,..o t 0 ...u 63 1:1 E FiE al" co1:. ,..,.. w = z

< 0 2 A rzi2U.

N

a

cn-'415:4 09 ..0"-= 4,0 64 $.9 4+,5a -0 of el) ^.Lid

. 0.0 00 c) bo 8rA ElL' t= cd

.)4 X4 r' VI :454.3

713.73')_41=S'

En MA4-40 0 ^1

4.) IS a)4-4 N 0 p

[2>

TOUGH DOG CORNER

Difficult Service Jobs Described by Readers

Shorted DiodeA customer brought in a 1963

Pontiac radio, model no. 5730367.He said it had a bad squeal. This wasconfirmed when I connected it up onthe bench and switched it on. Thesqueal was caused by an open 30 µffilter. Replacement of this componentsolved the problem. The radio was"cooked" for two hours or so and itseemed to be functioning normally sothe set was returned to the customer.Several days later the customer wasback with the car complaining of lowvolume.We checked the antenna andspeaker before pulling the radio. Bothchecked out OK so the radio wasremoved from the car. With an audiogenerator and scope I determined thatthe gain of the audio output stage wasvery low. Replacing the 1000 µfcapacitor (C36), corrected this prob-lem and the radio seemed to be oper-ating OK again, especially on the localstation. But in checking the radio inthe car after installation, I noticedthat it had a low volume on distantstations. I called my partner out tosee if he thought the volume wasdown. He agreed that the radio wasnot functioning properly so back theset went into the shop. I replaced theRF transistor with no noticeable im-provement in output. With a noisegenerator, we began signal tracing atthe audio output stage. This checkconfirmed our previous scope checkof this stage - that the output stagewas operating normally. Moving backto the base of the first audio ampli-fier, it was determined that this stagewas also functioning properly. In fact,with the noise generator fed into theantenna the output seemed normal.All voltages checked OK. All transis-tors checked out fine on an in -circuittransistor checker. About the onlything in the set that I hadn't checkedwas the diode detector. A resistancecheck revealed that the diode had alower than normal reading in the re-verse direction. The diode was re-placed and the radio then operatedperfectly even on the distant stations.The radio was reinstalled in the carafter cooking for three hours. Fullvolume was obtainable on all stationsafter installation. The customer has

been in the shop since and said thatthe radio now picks up the distantstations with ease. The thing that stillpuzzles me is why the audio qualitywas so good with a defective diode.-Danny St. Onge, Lethbridge, Alia.Canada.

Hot Network ResistorA "dog" I'll never forget showed

up in a 126 RCA chassis. The com-plaint was "not enough width." Widthwas "shy" about two inches on eachside. A 1/2 w, 4.7 K resistor connectedto the center tap of the horizontalyoke winding was burned to a crisp.

Checks with a VTM did not revealany shorts or leakage anywhere in thehorizontal output circuit. I replacedthe resistor, switched the set on andthe resistor promptly began to smoke.I removed it altogether and placed asmall capacitor across the width coil.To my surprise, the brightness re-mained exceptionally good and thewidth expanded fully. I left the re-sistor out and the set worked fine. Idelivered the set-with exhausted pa-tience and loss of pride-and itworked in a very satisfactory manner.But the set was back in the shopwithin three weeks. Since there wasa complete loss of raster this time,I was happy to see it come back sincethis offered some hope of restoringmy pride.

HOR YOKE

FLYBACK

WIDTH

The fault this time proved to beonly a bad 1X2. I experimentally re-moved the capacitor across the widthcoil and found myself back where Ihad previously started.

Now I began to reason, since addedcapacity restored the width, perhapsan open capacitor in this network wascausing loss of proper width and over-heat also. I looked for the capacitorthat most effectively shunted the

"width circuit." It seemed to me thatthe 0.0015 pf capacitor (see sche-matic) did just this. One side is con-nected directly to the width coil andthe other side is connected throughtwo capacitors to the flyback wind-ing.

When this capacitor and the 4.7 Kresistor were replaced the resistor ranperfectly cool and the set had plentyof width.

I'll remember this one for a longtime. If I had originally consideredthe relative "high frequency" involvedin this network I would have knownthat a "detuned" condition in thecircuit would have caused heavierthan normal current to be drawn bythe resistor. At any rate, my pride hasbeen restored.-Oscar Schectar, Pitts-burgh, Pa.

TOUGH DOGS WANTED$10.00 paid for acceptable items. Usedrawings to illustrate whenever neces-sary. A rough sketch will do. Photo-graphs are desirable. Unacceptable itemswill be returned if accompanied by a

stamped envelope. Send your entriesto "Tough Dog" Editor, ELECTRONICTECHNICIAN, Ojibway Bldg., Duluth,Minneosta 55802.

-<(<<<

>>,

nom,)

"Go fetch the rest of the flock. I'vefinally found a place to spend thenight."


Now you can quickly locate defective capacitorsaffecting the performance of electronic circuits

-and prevent costly call-backs!

CAPACITOR TESTING

IN-CIRCUIT/OUT-OF-CIRCUIT

IS QUICK AND EASY (1,,

NEW a§/1 CAPACITOR ANALYSTfor TV, Radio, Transistor Radio, Auto Radio, Hi-Fi, and other electronic equipment

Unique new B & K development puts themeasurement of capacitors and electrolytics ona practical basis-picks up all defects that willaffect performance-turns lost time into profitdollars.

Servicemen are aware that capacitors andelectrolytics are second only to receiving tubesin creating the most servicing problems.The new B & K Capacitor Analyst enablesyou more easily to measure capacitance andleakage resistance-detect both opens and shorts-both in -circuit and out -of -circuit. In -circuitleakage resistance test can be made on low -voltage circuits such as transistor radios, or onhigher voltage circuits. Checks capacitor valuefrom 25 pfd to 100 mfd.

Tests electrolytic capacitors by unique cir-cuit (Pat. Pend.) which determines how well theelectrolytic does the job of storing electricalenergy and returning it back to the circuit. De-tects marginal electrolytics that should be re-placed. Also predicts life expectancy of anyelectrolytic capacitor rated 3 volts or more.

Model 801 Capacitor Analyst is attractive,rugged, and easy to use.

NET, 6 109 95

Ask Your B & K Distributor for Details,or Write for Bulletin No. 108-T

B & K MANUFACTURING CO.DIVISION OF DYNASCAN CORPORATION1801 W. BELLE PLAINE AVE. CHICAGO, ILL. 60613

Canada: Atlas Rad!) Corp., 50 Wingold, Toronto 19, Ont.Export: Empire Exporters. 123 Grand St., New York 13. U.S.A.


AUGUST 1965 67

--IIv:. FOR MORE INFORMATION CIRCLE NEW PRODUCT NUMBERS ON POSTCARD INSIDE LAST COVER.

NEW PRODUCTS

Speaker System 200This high fidelity speaker system,

846A, is finished in hand -rubbed wal-nut and consists of a cast aluminum

sectoral horn powered by a HFdriver, a low frequency speaker, anda two -section 800 cps dividing net-work. The manufacturer says thespeaker system has a frequency re-sponse of 30 - 22,000 cps and a powerrating of 30 w. It is designed tooperate from 8 or 16 t2 and stands293/4 x 271/2 x 19 in. Altec Lansing.

CB Radio 201This two-way unit for automobiles

has five channels, a lighted channel

selector switch and a transmitter out-put light. The transceiver measures6'/4 in. x 8 in. x 11/2 in. Raytheon.

Servo Tool Kit 202A kit of tools for troubleshooting

and repair of complex equipment in-cluding computers, delicate instru-ments and business machines is an-nounced. Tools are contained in vinylroll up case. The tool kit consists ofone each of the following: snip wirecutter, swivel screw driver, 25 w

soldering iron, wire stripper, bucketmicroscope, pin vise, chain nose plier,pocket contact burnisher, inspectionmirror, pkg. of 12 replacement bladesfor burnisher, nickel tweezer andlocking plier. Jonard.

Multiplex Generator 203The FM Multiplex Signal Generator

provides a controlled amplitude com-posite audio signal for direct injectionbeyond the detector into the multi-

RICO Model 342 FM iMPX Signal Generator

plex section of a tuner or receiver,plus a 100% modulated (±75 kc)FM radio carrier, modulated by thesame composite audio signal, whichcan be fed to the antenna terminals.The frequency of the RF carrier isadjustable and is ordinarily set atabout 100 Mc. Left -only, right -only,sum or difference signals may be pro-vided by the built-in 1 kc oscillatoror an external audio signal generatorconnected to a panel jack. A crystalcontrolled 19 kc pilot signal is pro-vided which may be switched on andoff independently and may be util-ized without the audio information.An oscilloscope sync output is pro-vided which delivers via an isolating

cathode follower either the 79 kcpilot signal or the 1 kc internal oscil-lator signal at the setting of a panelswitch. An input is provided for con-necting an external audio signal gen-erator to provide an SCA signal. Theunit is 81/2 x 53/4 x 121/2 in. andweighs 10 lb. EICO.

Sleeving 204A thin wall, electrical sleeving, com-

posed of a high dielectric strengthfilm, thermally bonded to a non-

woven polyester mat is announced.Called 1X6029 polyester web -filmsleeving, it is designed for low volt-age motors, hermetic motors, trans-former, alternators and electronicequipment. Nominal wall thickness is0.0055 in. 3M.

Grease 205A lubricating grease, designed for

electrical contacts and packaged in apressure can, is introduced. It is a

SLIDE EZ"IASI

so.na,aoteo. 103.0.

COITACT LIAMINONI

mmassawrprow WINN

MI ameba WIMP

lubricating grease for electrical con-tacts, packaged in an aresol can, andcontains an anti -oxidant to preventcorrosion and to extend part life.Injectorall.


ONITIVThe quality goes in before the name goes on

FOR THE FINEST COLOR AND UHF RECEPTION

INSTALL ZENITH QUALITY ANTENNAS...to assure finer performance in difficJIt reception areas!More color TV sets and new UHF stations mean new anter nainstallation jobs for you. Proper installation with antennasof Zenith quality is most important because of the sensi-tivity of color and UHF signals.

ZENITH ALL -CHANNEL VHF/UHF/FMAND FM -STEREO LOG -PERIODIC ANTENNAS

The unusually broad 3andwidth of the newZenith VHF/UHF/FM and FM -Stereo log -periodicresonant V -dipole arrays pulls in all frequenciesfrom 50 to 900 mc-television channels 2 to 83plus FM radio. The multi -mode operation pro-vides high gain and good rejection of ghosts.

These frequency independent antennas, devel-oped by the research laboratories at theUniversity of Illinois, are designed according toa geometrically derived logarithmic -periodicformula used in satellite telemetry.

ZENITH QUALITY HEAVY -DU -7YANTENNA ROTORS

Zenith quality antenna rotors areheavy-duty throughout-with ruggedmotor and die-cast aluminum hoLs-ing. Turns a 150 -lb. antenna 360 c e-grees in 45 seconds. The weather-proof bell casting protects the Li -litfrom the elements. Each rotormounts easily to either a mast ortower without an adapter.

'gamNIMINIEW

ZENITH QUALITYWIRE AND CABLE

Zenith features a full line of qualitypackaged wire and cable. Also espe-cially d-asigned UHF transmissionwires, sold only by Zenith. Zenithwire and cable is engineered forgreater reception and longer life,and is available in various lengths tosuit every serviceman's needs.

Check the Yellow Pages for the Zenith Distributor nearest you.Or write to Zenith Sales Corporation, Parts and Accessories Division,

5801 West Dickens Avenue, Chicago, Illinois 60639,for Distributor name plus complete catalogue and technical

information on Zerith Quality antenna installations.Specifications subject to change without notice.

AUGUST 1965

, for more details circle 51 on postcard

69

There's a tool right herefor any soldering need.And you know it's best

because it's from

.0154

Dual Heat Soldering Guns.Weller guns reach full soldering temperature up to40% faster than other guns. Up to 28% greater solder.ing efficiency. Two trigger positions let you switchinstantly to low heat for soldering near heat -sensitivecomponents-or high heat when you need it. Spot-light illuminates work. Three models cover all needs:100/140 watts-Model 8200 - $5.95 list145/210 watts-Model D-440 - $9.95 list240/325 watts-Model D-550-$10.95 list

ninemon.wow

"Pencil" Soldering Iron. Small, lightweight, efficient.A 25 -watt, 115 volt iron that weighs only 13/a ounces. Yet it does the work of ironsthat weigh twice as much and have much higher wattage. You can hold andmaneuver it as easily as a pencil. Recovers heat rapidly. Maximum tip temper.ature 860°F. With 1/2" screwdriver tip and cord. Model W -PS --$5.20 list.

Temperature -Controlled Low -Voltage Soldering Pencil.New! For universal soldering including heavy-duty chassis work. Temperaturecontrol is in the tip. Interchangeable tips give a choice of 500°F, 600°F, 700°F and800°F controlled temperatures. Operates on 24 volts. Small, lightweight, highlyefficient. Complete with 3/16" 700°F tip and 60 watt, 120 volt, 50/60 cycle powerunit which has stand for soldering pencil attached. Model W-TCP-$26.00 list.

AT YOUR ELECTRONIC PARTS DISTRIBUTOR

WELLER ELECTRIC CORP., EASTON, PA.In Canada: Weller Electric Corp., 121 Counter Street, Kingston, Ontario

WORLD LEADER IN SOLDERING TECHNOLOGY... for more details circle 48 on postcard

.1( NEW PRODUCTS,46

Alternator Suppressors 206Three noise suppressing kits, each

designed for installation in Chrysler,Ford, or General Motors vehicles hay-

ing alternator electrical supply systemsare announced. Type SK -10 is in-tended for Chrysler cars and trucks,while Types SK -20 and SK -30 areengineered for Ford and GeneralMotors vehicles, respectively. For useon cars or trucks with citizens' bandamateur, industrial or public servicemobile radio equipment, the kits in-clude LC networks and thru-passcapacitors to handle the hash andeliminate the siren -like whine causedby the alternator output, providingeffective interference suppressionthrough 400 Mc. Sprague.

Temperature Tester 207The Model 255 includes the VOM

functions of a meter plus the addi-tion of a temperature range package

of +100° to +1050°F. It can be usedin many fields, including gas appli-ance servicing and installation, elec-trical utilities and heating service andinstallation. A low my drop is pro-vided on the ranges. By using an acclamp -on adapter, ac currents through250 amp can be checked without dis-connecting the leads or otherwiseopening the circuit. Simpson.


FINCO CoALNOTRE-ZrWG

FOR UHF, VHF, FM RECEPTION

The one antenna that does the work of 3! Gives startlinglyclear black and white pictures and beautiful color onboth UHF and VHF television channels - plus the finestin stereophonic and monophonic sound reproduction.

FINCO's Color-Ve-Log challenges all competition! Its

swept -element design assures the finest in brilliant colorand sharply defined black and white televisicn recep-tion - as well as superb FM monaural and stereo quality.

FINCO M odel UVF-18-$42.50 listFINCO Model UVF-16 $30.50 listFINCO Model UVF-10-$18.50 list

FINCO Model VL-18-$54.50 listFINCO Model VL-15-$46.95 listFl NCO Model VL-7 $23.95 listFINCO Model VL-5 -$16.95 list

Featuring FINCO's exclusive Gold Corodizing

FINCO COLOR-VE-LOGPrices and specifications subject to change without notice

THE FINNEY COMPANY 34 W. Interstate Street Bedford, OhioWrite for beautiful color broch.ires Number 20-322, and 20-307, Dept. no


AUGUST 1965 73

NEW PRODUCTS

TV Antenna 208This dome -type antenna measures

8 x 18 in. and can be mounted on theroof, under the eaves or in the attic

with four screws. The manufacturerclaims that the antenna will providesatisfactory reception on both VHFand UHF. Eagle.

Indoor Antenna 209An indoor antenna, featuring ele-

ments with individually spring -loadedball sockets, is announced. This de-sign allows 360 deg pivoting for extra

fine adjustments in critical signalareas, according to the manufacturer.Over-all construction employs texturedmaterial similar to leatherette witheither chromate or chrome finish.Brach.

AM/FM Stereo Tuner 210An all transistor AM/FM stereo

tuner is announced. Sensitivity of theST2000 is rated at 2.9 µv IHFM forFM and 50 µv/meter for AM. IFrejection is 55 db, with image rejec-tion better than 45 db and spurious

response rejection exceeding 60 db,according to the manufacturer. It hasa stereo indicator light and a con-venience outlet. The unit measures131/4 x 43/s x 101/2 in. Shippingweight is 9 lb. Harman Kardon.

Oscilloscope 211A specialized oscilloscope designed

for frequency deviation measurementis announced. The FM deviationmeter is essentially a broad -band FMreceiver. Audio output voltage froma calibrated discriminator is used as

a measure of modulation deviation.The discriminator output is amplifiedand directly coupled to the verticaldeflected plates of the CRT. A crystalcontrolled calibration marker is in-cluded in the instrument. Radio Spe-cialty.

wirurewmow w ler wimirmprThe only solid state TENNA-ROTO

ALLIANCE

Distributors and dealers are enjoying amazing sales re-sults with the solid state C-225 Tenna-Rotors.Its patented phase -sensing bridge circuit is patternedafter scientific test equipment to afford the TV and FMstereo owner life -like 'studio' reception.Alliance Tenna-Rotors are built to handle today's largernew antennas. They will support, hold and turn anyantenna that can be lifted and placed on them. Carefulworkmanship and precision components provide longerlife and dependable, trouble -free operation.

Check the C-225 "plus" features accurate repeatability constant synchronization silent operation greater sensitivity

Quality features you expect from the world's leadingmanufacturer of antenna rotating devices. Sell the lineyou sell with confidence - Alliance Tenna-Rotors!Order the C-225 and other quality Alliance models today.

"TV's better color getter"For Complete Details write ...

The ALLIANCEManufacturing Co., Inc.Alliance, Ohio

(Subsidiary of ConsolidatedElectronics Industries Corp.)

111

74 ... for more details circle 10 on postcard


ALL NEW FROM

MULTI -SOCKET

SPEED...No Compromise

In Accuracy!

V.. ik ggi

0 .0 MB

0

OBSOLESCENCE

PROTECTION

Realistic, PracticalNo Compromise!

MORE PROFIT

BecauseYou'll Sell

More Tubes...Sell ThemHonestly!

MODEL 799

$19995

From the laboratories of the world's leading tubetester manufacturer comes the model 799 "Mustang"-a completely new tube tester.Multi -socket tube testers used to have two seriousdrawbacks: circuit limitations made them obsoleteovernight and, at best, no more than 10% of theirtests were actually mutual conductance. But theHickok "Mustang" doesn't compromise; it delivershonest mutual conductance tests. And a unique cir-cuit approach, together with an easily replaceableaccessory socket panel, makes it "circuit ready" for

any possible new tube types.A solid-state power supply gives increased accuracyand dependability. An all -transistorized gas and leak-age test circuit sets a new standard of reliability forspotting "tricky" tube defects that can "chew up"your profit. You can actually read interelement leakageto 50 megohms; gas 'grid leakage effects to 0.1 ma!

We call it the "Mustang" because it uses fresh, newengineering ideas and because it gives you a realopportunity to break into new profits.See it at your Hickok distributor or write for circular TT799.

Ask your distributor about the Hickok credit plan.

THE HICKOK ELECTRICALINSTRUMENT CO.10523 Dupont Avenue, Cleveland, Ohio 44108Represented in Canada by Stark Electronics, Ajax, OntarioInternationally by Hughes International, Culver City, California

P=Iltik-1.211,4X71a4 -14

AUGUST 1965


75

NEW PRODUCTS

Power Transistor 212A transistor designed for high

power handling capabilities is an-nounced. The transistor can handle

up to 100 rms power in class ABaudio power output applications. Theratings of the DTG-110B are: VeEx =-90v; VCEO = -40v; lc = 25 amp;VcE (sus) at Ic of 5 amp = -40v min.Delco.

Field Strength Meter 213This portable field strength meter

has a sensitivity of 514v on VHF andFM and 15 µv on UHF, the manu-facturer reports. Either 300 it or 75 n

input impedance is available. The unitis said to have a 500 kc bandwidth.It has a 4 in. meter calibrated in bothmicrovolts and db. Sencore.

Control Shafts 214Thirteen exact length control shafts

have been added to a line of replace -

VV

ment controls. Three types of nylonsingle control shaft styles are includ-ed. These are 1/4 in. diameter withknurl and screwdriver slot, and 1/4

in. and 3/16 in. diameter with .156in. flat mill. Two metal single controlshafts for replacement of G -E "bulletend" controls are also available, sincethe standard shafts will not accept thespecially constructed knobs used withmany G -E controls. Centralab.

Knobs 215A line of round bar knobs in four

styles for instrument use is announced.They are offered in plain round, ring -

skirted round, and dial -skirted roundstyles. A round bar is also availablewith a concentric base for dual con-trol applications. Raytheon.

SERVICEMAN

STANCORTHE COMPLETE LINE

FLYBACKS YOKES VERTICAL OUTPUTSAUDIO OUTPUTS RF AND IF COILS

POWER WIDTH AND LINEARITY COILS EXACT TUBE -IN -SOCKET REPLACEMENTS NO EXTRA HARDWARE NO CIRCUIT MODIFICATIONS COLOR- - BLACK & WHITE

FOR 11 MAJOR MANUFACTURERS*LAST 7 MODEL YEARS

AND MOST OTHERS

Ask your Distributor for a copy of the new TV Replacement Guide

Stocked by over 1000 Service Parts Distributors - Back up Stock Chicago Dallas Los Angeles New York

ELECTRONIC MARKETING DIVISIONESSEX WIRE CORPORATION3501 W. Addison StreetChicago, Illinois 60618

In products, performance, purpose . . . Essex measures up.


GELECTRONICS

MIND

11111_._1111.

flare

Patent Pending

NM.

Man

anrrminmm

NM.

P-

46,_..Ar lowNew

Maas

RECOMMENDED BY

PH I LCOpit COL LW

& BLACK AND WHITETV INSTALLATION

OLTORMilafC

FHRFUNDAMENTAL HARMONIC RESONANCE-GC'S EXCLUSIVE DESIGN PROCESS!Colormagic elements resonate on the fundamental harmonics within both the high andlow bands. Colormagic FHR outperforms the average second harmonic TV element by

producing a tight, laser -linked directivity of signal...higher gain! It's in the elements!

GC "GOLD -GUARD" anodizing process guards againstpitting, chipping, rust and corrosion...makes the Colormagicseries the best protected, all-weather line available!

GC "SOLID-SEMBLED'' construction insures quick, easyinstallation...rigid-lock elements snap securely into place

Compare! Colormagic AntennaSystems offer pencil -point polarpatterns...laser-linked directivity...flat plateau response curve...no traps or peaks...excellent forcolor or black & white TV recep-tion.

270.

330.

1110.

15 All -New Colormagic Combo -Couplers permit cross -directionreception of UHF -VHF -FM anten-na combinations...each unit en-cased in high -impact polystyrenecase...supplied with stainlessSteel mounting strap. Completesales program available.

See your GC Distributor! He'll fill you in on this "prestige" package. CONSIDER THE ELEMENTS INVOLVED! ...then GOCOLORMAGIC! If not stocked locally, write us for name of Distributor nearest you.

GC ELECTRONICSDIVISION OF TExTRON ELECTRONICS. INC

EASTERN PLANT: HICKSVILLE, L.I., N.Y.MAIN PLANT: ROCKFORD, ILLINOIS, U.S.A.WESTERN PLANT. LOS ANGELES, CALIF.

AUGUST 1965

.for more details circle 25 on postcard

77

Which

for tape recording for broadcasting for CB and ham for public address for any application..Free Booklet-Everything YouWant To KnowAbout Micro-phones! SendCoupon Today!

microphoneshouldI use?"'

UNIVERSITY.Desk ET, P. 0. Box 1056, Oklahoma City, Okla.

Name

Address

City State Zip Code_


NEW PRODUCTS

Lead Acid Battery 216A 6 v rechargeable lead -acid bat-

tery is introduced. Because it containsno free electrolyte the battery is leak-

proof, splashproof and spillproof, themanufacturer says. The battery is de-signed for TV sets, radios, camp light-ing equipment, hedge trimmers, lawn-mowers, typewriters and other cord-less electrical devices. The unit mea-sures 1 3/16 x 2 23/32 x 3 25/32in. It weighs less than 1.5 lb. Yuasa.

Tape Recorder 217This capstan -drive tape recorder

operates at 17/8 and 33/4 ips on stand -

NEWCOLORCRT T1 -41STADAPTER-for use withMotorola 23EGP22,RCA 25AP22, andother CRT's with14BE basing.

This single adapter will allow you to testboth the new Motorola and RCA colortubes with your present test equipment.Keeps testers up to date-adapts minia-ture diheptal socket 14BE basing (usedin these 2 tubes) to standard neo-diheptal14AL '14AU basing (found on currentcolor tlitx. testers).

POMONA

Miniature Diheptal Socket14BE Basing

2

VV3 4

VV5

V79 1 1131

V3',S6 I) 13 12 111 16

SCHEMATIC

Ne ,-Dihepta 1 Base14AL/14AU Basing

Features-provision for accepting basesequipped with spark gaps.

Rugged, compact, easy to use. Built toPomona Electronics' high standards ofquality in materials and workmanship.

MODEL 2276 NET $5.95

nr 7.7' 771500 East Ninth Street, Pomona, California 91769 Telephone (714) 6233463

and flashlight batteries or 117 vacwhen used with an external ac adapter.It has a single -lever control for play,record, rewind and stop, inputs forremote microphone or telephone pick-up and for radio recording; plus out-puts for earphone or speaker. TR-520 comes equipped with a VUmeter, safety -recording lock and fast -forward control. Dimensions are 111/2x 91/2 x 41/2 in. Weighs 10 lb withtape and batteries. Craig.

Truck AlarmAn alarm to guard passenger cars

and trucks against looting is intro-duced. The alarm is set by a tamper -

218

proof lock in a front fender well.While it is set, the alarm sounds whenthe hood is raised, a door is opened,or the trunk is opened. Aqualarm.

Spin Rachet 219A spinning ratchet tool which inte-

grates ratcheting and spinning is an-nounced. The ratcheting action pro-

vides leverage for breakaway andfinal tightening; spinning for highspeed. The handle of the ratchet isany conventional square drive spin-ning handle and may be replaced byother socket equipment to provide theoperator with the desired combina-tion. The ratcheting action is per-formed by the usual side motion;spinning is accomplished by spinningthe handle. Amtronix.



NEW PRODUCTS

Lab Cart 220A stainless steel instrument labora-

tory cart is introduced. The four -deckinstrument cart has removable ply-

,Iste ,;; 'a.;.z.

.

wood decks. Over-all width of theCE1500-2 is 245/8 by 31'/4 in.; cart is585/s in. high with the top deck 55in. high. Openings between decksare 13, 14 and 171/4 in. from thebottom up. A 6 -outlet receptacle, with6 female plug outlets, ON/OFF lightswitch, fuse, 10 ft cord with holdingcleat, is included between the bottomtwo shelves. Cambridge.

Base Stations 221A line of base stations for mobile

radio systems is introduced. Transmit-ter modulation distortion is rated at3% or less for 1000 cps. The unithas two audio outputs from the re-ceiver. The first is a 3 w output intothe local speaker, with a responsebetween 1 and -8 db from 300 to3000 cps; the second is to the tele-phone line which goes back to theremote control console. This output

is rated at plus 18 dbm and has a re-sponse of plus 1 to -3 dbm from 300to 3000 cps. Motorola.

Plug -in -Relay 222A series of small plug-in relays is

announced. These relays are multi -contact units available for operationfrom 6 vac or dc to 115 vac or dc.They are general purpose relays de-signed for handling light power loadson small motors, solenoids, and otherrelays, as well as general automationwork. The plug-in relays are enclosedin a plastic dust cover equipped withstandard 8 -pin octal plugs and 11 -pin

plugs. Contacts are 3/16 in. dia andrated at 5 amp or 10 amp. Weightapproximately 3 oz. Seated dimen-sions: 1 13/32 x 1 13/32 x 2 in.ATR.

SEND THE HANDY COU-PON INDICATING YOURNEEDS

ROHNManufacturing

Co.BOX 2000

PEORIA, ILLINOIS

The mos/ Famous Name inTOWERS of All AVIDIYHere are the advantages you getwhen you insist on ROHN TOWERS

LARGEST FULL RANGE OF TOWERS-you can get any-thing from home TV and amateur radio towers toheavy-duty communication and micro -wave towers.Included are 500 foot self-supporting towers, 1,000foot guyed towers, "fold -over" and crank -up towers.Regardless of your needs, ROHN can supply it.UNQUESTIONED LEADERSHIP IN DESIGN AND MANU-FACTURE-you get the latest in advanced tower engi-neering. All communication towers are engineeredto EIA specifications, and are proved by thousandsof installations. No other manufacturer can surpassthe quality and fine reputation of ROHN.QUALITY MATERIALS AND WORKMANSHIP-Only high-est quality steel is used which fully meets the speci-fications for the job. ROHN towers are hot -dippedgalvanized after fabrication-a feature ROHN pio-neered!

SERVICE WHEREVER YOU WANT IT-ROHN represent-atives are world-wide. Complete erection service forcommunication systems, broadcasting, micro -wave,and other needs is available; also competent engi-neering service to help you.

Settle for the BEST In TOWERS-ROHN-today theworld's largest, exclusive manufacturer of towers ofall kinds!

For your needs, contact your local ROHN salesman,distributor or dealer; or write direct for information.

ROHN Manufacturing Co.Box 2000Peoria, IllinoisAnd me complete Illwahms en the following ROHN Products:

El Homo TV Towers 0 Amateur Towers Cenanunketion Towers AM -FM broadcasting Towers

0 Micro -Wave Towers 0 GovernmentName

Firm

Add.,"

City State

-1

AUGUST 1965


79

Exact Replacement Coil Service

by Miller can help you 4 ways

WIDEST LINE of replacement coils in the industry-over30,000 listings in catalog cross reference guide.

NATIONWIDE DISTRIBUTORS stock Miller replacementcoils on their shelves for immediate delivery to you.

SAME DAY SHIPMENT for virtually all orders received when

distributors are temporarily out of stock.

NON -CATALOGED REPLACEMENTS receive same fastservice. Just indicate model no., part no., chassis no.

J. W. MILLER COMPANY5917 South Main Street Los Angeles, California 90003

See your local distributor for the full line of RF and IF coils, chokes, filters and transformers.


READY ... NOW!

NEW SadUHF/VHF

TV ANTENNASFOR

Black/White & Color

6651 Gold Finish6652 Chrome Finish

Ultimate Unequalled Outstandingin Design! in Performance! in Value!

BRACH MANUFACTURING CORP.DIVISION OF GENERAL BRONZE CORPORATION

899 MAIN ST., SAYREVILLE, NEW JERSEY

-NEW LITERATURE

Amplifiers 300Two bulletins describe a line of

audio amplifiers. Features and speci-fications of the amplifiers are in-cluded. Browning.

Transistors 301A line of five transistors are cross

referenced with numerous others usedin various types of circuitry. Thesefive transistors can be used for re-placements in radios, phonographs,tape recorders, amplifiers and otherentertainment type electronic equip-ment. Workman.

Coaxial Cable 302Specifications for a line of semi-

flexible aluminum sheathed coaxialcable are contained in this 20 pagecatalog. It also includes informationon a series of coaxial cable con-nectors. Times.

Power Tubes 303This five page brochure describes

a line of high power tubes designedfor applications in radar and micro-wave modulators. Included are bothceramic and glass hydrogen filleddiodes and thyratrons. Tung-sol.

Electrical Components 304A 68 page catalog covers a wide

variety of tube sockets, plugs, con-nectors and other electrical compo-nents. Electrical and mechanicalspecifications are given for the com-ponents listed. Amphenol.

Conversion Chart 305A pocket conversion chart includes

conversion of micro -inches to anglesand angles to micro -inches; inches tomillimeters, microns and angstroms tomillimeters and microns to angstromsto inches. Also shown are wavelengthsof monochromatic radiations for gageinterferometry; selected physical con-stants and other data. Engis.

Tools 306A line of specialty tools is described

in this 150 page catalog. The catalogis sectionalized according to productcategory. Screw drivers, nut drivers,terminals and crimping tools, pliersand wrenches, specialty tools, displayand carded items, business gift andpremium items are included. Vaco.



LOOK!A New Electronics Slide Rule

with Instruction Course

11%141%1

I

YidL

I{ '1,

7*- ,

SG

I.1,111,191114 1910

OA

6 1 Poor 1.448c., p OA 041 4141 D.M.

LW,- 14. St ON elm MOCadv. am, v. 1. ...II. .1114 t t t -,T:

;I: .I.:1 it; ;I; it; s'i its sti t,i sti

,s-77i77R. - 'Wm

4., IND UM [Jo.. -4 4 = OW 41MEP So t Win

. OP 4 1 9 41 9101..AO 5 . I Ns 95 .1

1 OD 10 1.11

v11,1111,111iiiii1;1et $ le On 95 115 OS 5911 I

T 11959015.951 555 15555

-

This amazing new "computer in a case" will save you timethe very first day. CIE's patented, all -metal 10" electronicsslide rule was designed specifically for electronic engineers,technicians, students, radio -TV servicemen and hobbyists.It features special scales for solving reactance, resonance,inductance and AC -DC circuitry problems ... an exclusive"fast -finder" decimal point locater ... widely -used formulasand conversion factors for instant reference. And there'sall the standard scales you need to do multiplication, divi-sion, square roots, logs, etc.

Best of all, the CIE Slide Rule conies complete with anInstruction Course of four AUTO-PROGRAMMErIessons. Itincludes hundreds of illustrations, diagrams and practiceproblems. You'll learn ingenious short cuts...whip throughexacting electronics problems quickly and accurately. Thiscourse alone is worth far more than the price of the

entire package!Electronics Slide Rule, Instruction Course, and handsome,

top -grain leather carrying case ... a $50 value for less than$20. Send coupon for FREE illustrated booklet and FREEheavy vinyl Pocket Electronics Data Guide. ClevelandInstitute of Electronics, 1776 E. 17th St., Dept. ET -104,Cleveland, Ohio 44114.*TRADEMARK

GET BOTH FREE!

Send coupontoday -+

I tv11144464,

-Y

Front

O

Back

OM UM Foram. et Got...

i 1-1

Nom

Fdt

V

t:1 44.4 Is. 444414.

'

.- ::.-.--, ,1-

--1-j51.

--r-k 10-1

to AI

electronics r "Pr smyrortrr or aaaaaaaaaco/ aaaaa taxa bo,.

Cleveland Instituteof Electronics1776 E. 17th St., Dept. EI -104, Cleveland, Ohio 44114Please send FREE Illustrated Booklet describing your Electronics Slide Rule andInstruction Course.SPECIAL BONUS! Mail coupon promptly ... get FREE Pocket Electronics DataGuide too!

Name

Address

City State ZipA leader in Electronics Training ...since 1934.

(PLEASE PRINT)

County

1

AUGUST 1965


MODEL 850CTRONIC VOLT -OHMMETER

; lox= 0KA-_,401

FACTS MAKE FEATURES:

1 Long 7" easy -to -read scale.

2 .5 D.C. volt range for transistor circuits.

3HIGH STABILITY. Meter connectedin cathode circuit of 12 AU7.

High Input Impedance (11 MEGOHMS) and wide FrequencyRanges give this extremely versatile Electronic Volt -Ohmmeterconsiderable advantage in the measurement of DC voltages,AC RMS and Peak -to -Peak voltages. It measures directly thePeak -to -Peak values of high -frequency complex wave formsand RMS values of sine waves on separate scales.

ADDED PROTECTION. Meter is shorted out in OFF posi-tion for greater damping, meter safety during transit, electri-cally protected against accidental overload. ZERO CENTERmark for FM discriminator alignment, plus other galvanometermeasurements.

New pencil thin test probe used for all functions: DC, AC,and ohms. No need to change cables. Beautifully styled casefor professional appearance and functional utility, 75/8" x67/16" x 33/".

Carrying handle can be used as a tester stand to place thetester at 25° angle for ease in reading.

Frequencies to 250 MC may be measured with auxiliary Diode Probe,$7.50 extra. DC voltages to 50 KV may be measured with auxiliary HighVoltage Probe. $20.50 extra.

TRIPLETT ELECTRICAL INSTRUMENT COMPANY, BLUFFTON, OHIO

VISIT US IN BOOTH 4223 AT THE WESCON SHOW... for more details circle 45 on postcard

NEWS OF THE INDUSTRY

Semitronics Names RepsLawrence Rivman, sales manager of Semitronics Corp.,

manufacturers of the Semitron line of semiconductors andother electronic parts, announces the appointment of twonew representatives: Fred A. Rosenwasser, Cleveland,Ohio, and John Thompson, Ormond Beach, Fla.

Turner AwardThe Turner Microphone Co., Cedar Rapids, Iowa,

recently presented a plaque for highest sales achievementfor 1964-65 to the Kelly-Schmitz-Winkeler Co. of St.Louis and Kansas City, Mo.

G -E Appoints DistributorGeneral Electric Company has appointed Allied Elec-

tronics Corp., industrial subsidiary of Chicago -based AlliedRadio Corp., as Midwest distributor of its line of thermis-tors. The G -E line, which includes more than 75 differenttypes of thermistors, will appear in Allied's 1966 industrialcatalog. W. G. Hart, manager, marketing and engineeringof G -E's magnetic materials section at Edmore, Mich.,which manufactures these specialty electronic components,said the addition of Allied as a distributor was promptedby the growing acceptance and usage of thermistors ascircuit components by electronic equipment manufacturersand hobbyists.

SINGLEDAWN -LEAD

FM

STEREO

GET TOTAL COLORand

TOTAL COUPLING

VHF UHF and VHF

Terminate tie down lead into the color set - couplethe remainilg inputs with Wizard Electro-Magnetic/All Channel Couplers - maximum color assurance!This example of signal distributing superiority isanother dra -vatic reason why Wizards are preferredover all other couplers-why Wizards enjoy the "first

call for couplers".$195

U.S. PATENT 2,915,6T9

THE

WIZARD 300Electro MagneticALL CHANNEL UHF VHF/FM/STEREO COUPLER

CHARLES ENGINEERING, INC.3421 N. Knoll Dr., Los Angeles, California 90028


ELECTRONIC TECHNICIAN82

Delco Radiooffers a new kindof volume control

This year you can get a DelcoRadio Parts Kit for each 1966General Motors car. You buy onlywhat you need-no more. That con-trols the volume of parts you needto carry.

There's a separate kit for Chevro-lets, Pontiacs, Oldsmobiles, Buicks,

and Cadillacs. Plus a Universal Kitwith parts that are interchangeableon all GM cars.

All kits contain the fastest movingparts and information pinpointingthe models they're meant for.Thereare no carryovers from previousyears.

Now's the time to order yourDelco Radio Parts Kits for the

makes you service most. Just callyour United Delco representative.

F'United 10DelcoDelco Radio, Division or General Motors, Kokomo, Indiana


83AUGUST 1965

VISUAL INDICATING0 - - - - ---

BODY SIZEONLY.145 x .300INCHES

For use on miniaturized devices, or on gigantic spacetight multi -circuit electronic devices.

Glass tube construction permits visual inspectionof element.

Smallest fuses available with wide ampere range.Twenty-three ampere sizes from 1/100 thru 15 amps.

Hermetically sealed for potting without danger ofsealing material affecting operation. Extremely highresistance to shock or vibration. Operate withoutexterior venting.

Insist OnMUSS Write for

BUSSBulletin SFB

BUSSMANN MFG. DIVISION, McGraw -Edison Co., St. Louis, Mo. 6 3107

Cabinet Plant ExpansionMore than 200 employees will be added to the work

force at Philco Corp.'s Watsontown cabinet plant, accord-ing to R. R. Austin, plant manager. The facility heremakes cabinets for television sets, radios and phonographs."This planned expansion of our work force will allow usto utilize the new plant capacity on a continuing basisand to the fullest possible advantage. The new warehousewill make it possible for us to increase substantially ourcabinet production rate at Watsontown. The improvementsto our cabinet finishing system included a new forced dryoven which will allow us to operate on a two -shift basisin that area. Both these changes have made it necessaryfor us to employ new people."

'Go -Getter' AwardIn recognition of their sales efforts on behalf of Claro-

stat Manufacturing Co., Inc., the Bruce Cummings organi-zation of Chicago was presented with the annual "Go-Getter" award for 1964. The "Go -Getter" award is pre-sented annually to those manufacturers' sales representa-tives who exceed their territorial sales quota.

Assistant Director of ResearchDr. Gerhard E. Weibel has been named assistant di-

rector of research for Zenith Radio Corp. Announcementwas made by Dr. Robert Adler, the company's vice presi-dent and director of research. Dr. Weibel joined the com-pany in June 1964. Prior to this, Dr. Weibel was associatedwith the General Telephone and Electronics Laboratories,Inc., at Bayside, N.Y. for almost ten years. Dr. Weibel,

BUSS : The Complete Line of Fuses and ...NEWS OF THE INDUSTRY

Wen Appoints RepsWen Products, Inc., Chicago manufacturer of power

tools and soldering guns, has appointed Northeastern Rep-resentatives, Inc., Framingham Center, Mass., to handle itsradio, television and electronic accounts for the states ofMaine, New Hampshire, Vermont, Massachusetts, Con-necticut and Rhode Island, it was announced by DeanPeel, Wen's national sales manager. Jack Lizars, DonLemire and Chuck Berube of the representative organiza-tion will be primarily responsible for prospect and clientcontacting, according to Peel. Fred J. Pickel is the regionalsales manager for this sales territory for Wen Products.

Reeves Appoints TwoTwo new sales representatives for the firm's line of

sound recording products have been appointed by theSoundcraft Div. of Reeves Industries, Inc. Stinson Asso-ciates, with offices at 227 Haverford Ave., Narberth, Pa.,will market Reeves Sound products in EIA territories 7, 8and 10, consisting of Eastern Pa., Southern N.J., Delaware,Maryland and Virginia. Gene S. Root & Co. has beennamed to represent Reeves in EIA territory 9, encompass-ing Western Pa., and West Virginia. The firm's office isat 809 Wainright Dr., Pittsburgh, Pa.

VISUAL INDICATING FUSES

BUSSSUB -MINIATUREFUSEHOLOER COMBINATION

CD®

FUSE ONLY.270 x .250INCHES

GMW FUSEand HWAFUSEHOLDER

For space -tight applications. Fuse has window forinspection of element. Fuse may be used with orwithout holder.

Fuse held tight in holder by beryllium copper con-tacts assuring low resistance.

Holder can be used with or without knob. Knobmakes holder water -proof from front of panel.

Military type fuse FM01 meets all requirements ofMIL -F-23419. Military type holder FHN42W meetsall military requirements of MIL -F -19207A.

Insist OnMiss Write forBUSS

Bulletin SFB

BUSSMANN MFG DIVISION, McGraw -Edison Co., St. Louis, Mo. 83107

... for more details circle I8 on postcard

ELECTRONIC TECHNICIAN84

Screw type slotted knob that is re-cessed in holder body and requiresuse of screwdriver to remove orinsert it.

Screw type knob designed for easygripping, even with gloves. Has a"break -away" test prod hole in knob.

BUSS Space SaverPanel Mounted Fuseholders

Fuseholder only 1% inches long, extends just inchbehind front of panel Takes .3'4, x 1 inch fuses. Holderrated at 15 ampere for any voltage up to 250.

Military type available to meet all requirements ofM I L -F -19207A.

Insist OnHUSS Write for

BUSSBulletin SFH-10

BUSSMANN MFG. DIVISION, McGraw -Edison Co., St. Louis, Mo. 63107

for color and slightly for black -and -white TV as com-pared to March 1964 and radio production also showedhealthy gains.

Sales of monochrome TV receivers totaled 662,755units in March, down 3.6 percent from the 687,746 soldin March 1964, but up 8.7 percent from the 609,538 totalshown for the previous month of February 1965. First-quarter sales of black -and -white TV sets totaled 1,904,302,down 9.8 percent from the 1,920,363 units sold in the firstquarter of 1964. Production figures for all television sets(color and black -and -white) in March totaled 995,956, arise of 13.5 percent from the 877,888 units produced inMarch 1964 and up 17 percent from the 850,888 unitsproduced the previous month of February. First-quarterproduction of TV sets totaled 2,591,898, a rise of 9.8percent from the 2,360,399 units produced in the com-parable quarter of 1964.

Of the total TV production, monochrome sets in Marchaccounted for 790,379 units, up 2.5 percent from thefigure of 771,488 for March 1964 and up 16 percent fromthe 681,365 units produced the previous month of Feb-ruary. First-quarter production of monochrome sets to-taled 2,089,041, up 0.7 percent from the 2,074,172 setsproduced in the same quarter of 1964.

Color -TV production in March totaled 205,577 units,a jump of 93.2 percent from the 106,400 units producedin March 1964 and 21.3 percent above the 169,523 unitsproduced the previous month of February. Color TVproduction for the first quarter totaled 502,857, a gain of75.7 percent over the 286,227 units produced in thecomparable 1964 quarter. Total production of radio sets(including auto) reached 2,305,993 units in March, up40.7 percent.

Fuseholders of Unquestioned High Quality

a native of Zurich, Switzerland, studied at the SwissFederal Institute of Technology, obtaining an M.S. degreein electrical engineering in 1946 and a Ph.D. degree in1954. He is a Senior Member of the Institute of Electricaland Electronics Engineers, a member of the AmericanPhysical Society and the Scientific Research Society of

America.

Sylvania Ad CampaignEntertainment products will be featured in advertise-

ments in ten national magazines beginning this fall, JohnT. Morgan, vice president - sales and merchandising,Sylvania Entertainment Products Corp. said. The adver-tising campaign, which will begin in September and con-tinue for three months, is designed to back up the com-pany's 1966 line of color and black and white television,stereophonic high fidelity phonographs and radio lines.Morgan said the ads will appear in the following maga-zines: Reader's Digest, Life, TV Guide, Time, Newsweek,Sports Illustrated, New Yorker, Saturday Review, Holidayand Sunset. He also said this year's budget is 30 percentgreater than in 1964, making the 1965 campaign thelargest in recent years.

Mono TV Sales Dip in MarchDistributor sales of monochrome television receivers

dipped slightly in March as compared to March 1964 butsales of radio sets climbed substantially, Electronic Indus-tries Association's Marketing Services Department reportedtoday. Production figures in March were up considerably

For protection of all types of electronic and electric devices

The complete line of BUSS and "TRON Family"fuses includes quick -acting, slow -blowing, signal orvisual indicating fuses in sizes from 1/500 amperes up.

All standard items are easily obtained through yourBUSS distributor, but if you don't find what youwant get in touch with us.

Insist OnBUSS Write for

BUSSBulletin SFB

BUSSMANN MFG. DIVISION, McGraw -Edison Co., St. Louis, Mo. 63107... for more details circle 18 on postcard

85AUGUST 1965

KIT OR ASSEMBLED!Eithee Way, These HEATH Instruments

Are Your Best Buy!

Heathkit IM -21 Laboratory AC VTVM. 10 voltage ranges -0.01 to 300 voltsR MS full scale 10 megohm input ZKit IM -21, 5 lbs $33.95Assembled I MW -21 $52.95

Heathkit IM -11 VTVM ... Versatile! 7 AC, 7 DC, 7 Ohms ranges Frequencyresponse .1_ 1 db, 25 cps to 1 mc.Kit IM -11, 5 lbs. $24.95Assembled I MW -11 $39.95

LC] Heathkit Wide -Band Oscilloscope 5 mc bandwidth Sweep 10 cps to 500kc 5' screen with graticule[ Kit 10-12, 24 lbs $76.95Assembled 10W-12 $126.95

Heathkit IM -13 "Service Bench"VTVM 7 AC. 7 DC, 7 Ohms ranges Extralarge 6' meter Gimbal mountingKit IM -13, 7 lbs $32.95Assembled IMW-13 $49.95

E Heathkit Variable -Voltage RegulatedPower Supply Furnishes B +, Bias. &Filament voltages Fully metered

QFI111161 Assembled IPW-32 $84.95

Kit IP-32, 16 lbs $56.95

E Heathkit Audio Generator Switch -selected output -10 cps to 100 kc Near -perfect sine waveKit 10-72, 8 lbs $41.95Assembled IGW-72 $64.95

Heathkit "Solid -State" RegulatedPower Supply 0.5 to 50 v. Up to

1.5 amp. Less than 150 uv rippleKit IP-20, 13 lbs $72.95Assembled IPW-20 $114.95

Heathkit Battery Eliminator Switchselect 6 or 12 v. DC power AC rippleless than .3%Kit IP-12, 20 lbs. $47.50Assembled IPW-12 $59.95

FREE CATALOGFully describes these at over 200 other dif-ferent and exciting Heathkits and savings of50% or more! Fill out the coupon below andsend for your FREE copy today!

r -HEATH COM 'ANY, Dept. 24-8Benton Harbor, Mich. 49023171 Please send my free 1965 Heathkit Catalog. Enclosed is $ , plus postage.

Please serd model(s)

Name(Please Print)

Address

City State ZipPrices & Specifications subject to change without notice. TE-134.

NEWS OF THE INDUSTRY

Mercury Acquires JacksonMercury Electronics Corp., Mineola, N.Y., manufac-

turers of electronic test equipment, has acquired all out-standing stock of Jackson Electrical Instrument Co. ofDayton, Ohio, for an undisclosed amount of cash, it wasannounced by Harry M. Rich, president of Mercury.Jackson has designed and built electronic test equipmentfor radio and 1V technicians for over 30 years. Thecombined new activity will give both companies con-siderable broader base and scope, the announcement said.The combined research talent of the two companies willbe utilized in the development of components and peri-pheral items, Mercury said.

RCA 'Overlay' TransistorA new RF power transistor, utilizing an improved

"overlay" technique to provide higher gain at higher fre-quencies is announced by RCA Electronic Componentsand Devices. The new silicon "overlay" transistor, desig-nated RCA 2N3866, will provide 1w power output atfrequencies between 30 Mc and 400 Mc with power gainsas high as 20 db, according to Ben Jacoby. The electricalcharacteristics of the new device makes it exceptionallyattractive for application in RF power amplifiers, broad-band video amplifiers, antenna boosters, phased -arrayamplifiers and high-speed switching circuits, Jacoby said.This 28-v transistor is said to offer good gain at drivelevels as low as 10 mw for driver and high efficiencyoutput 1w power output the following minimumpower gains are claimed: 20 db at 100 Mc, 16 db at 175Mc, 14 db at 250 Mc, 10 db at 400 Mc and 4 db at 1000Mc. The transistor guarantee point is 10 db minimum at400 Mc.

Zenith Introduces Transistorized PortableZenith Sales Corp. announces a 12 in. all transistor

portable battery -operated receiver. The Royal 1290 hasa battery pack which slips into the bottom and becomesan integral part of the receiver when in use. The set canalso operate from a 12 v system as well as from 120 vac.The list price of the unit is $199.95.

Suit DismissedThe Federal District Court in New York City dismissed

the patent infringement law suit recently brought againstGavin Instruments, Inc. of Somerville, N. J., by Isaac S.Blonder of Blonder -Tongue Laboratories, Inc. of Newark,N. J. The Court held that this law suit was wrongfullybrought by Blonder against Gavin in New York City andordered the complaint against Gavin dismissed.

Factory Assembled InstrumentsHeath Co., Benton Harbor, Mich., announces that ten

kits in their test instrument line are also available factoryassembled. Previously, the company offered five of theirmost popular instruments in both kit and assembled formon an experimental basis. According to company officialsthe assembled versions received wide customer acceptance.And as a result, the company received many requests fromhobbyists, service technicians, and various industrial usersfor more factory built versions of Heathkit test instru-ments.

86

. for more details circle 26 on postcard


Long -Time ET Reader

Obtains Patent

On TV Antenna

United States Patent Office

1

3,165,817METHOD OF MAKING A COLLAPSIBLE ANTENNA

OF WIRE MESHGrady L. Teague, Rte. 1, Box 726, Porten ille, Calif.

Filed Sept. 10, 1962, Ser. No. 222,3233 Claims. (Cl. 29-155.5)

This invention relates to a high gain directional an-tenna of the plane -reflector type and more particularlyto such an antenna which can be economically fabricatedand assembled for shipment and which presents mini-mum shipping dimensions.

The present invention is described as an antennaadapted to receive electromagnetic energy of the fre-quency employed in commercial television broadcasting.Antennas for such a purpose have been previously madein a great variety of forms, many of which are of con-siderable expense.

Normally, the conventional television antenna com-prises a multiplicity of parts which are assembledbolted connections. Accordingly, a great degree of diffi-culty usually attends their assembly. Also, their struc-tural design results in large assembled dimensions whichprecludes their being shipped in a pre -assembled con -

/0

RI

3a

11 16 15

RO

50

53

IRR

111

31 30

°0re°_10!..8100404..re-- .°I 31 tri :1Ri

R0

3i

3R Op II? 711rikii0 iiPr-

---0.4011%:b 0 54'5oil ..! fr-

,........001,100101101V4./

100 10101°°V RI. 30001100 V°4,/l 110-00-d.0...00i, Oil Ro00,00volIrl° R R

RO

35

31

RI

I

U.S. PAT. NO.2727089

StafteeaIftdaeatata

best forVH F... a must for

UHF\., and

color

COMPLETELY INSULATES LEADIN WIRE FROM METAL

Available with all Standoff Insulators.Also separately for use on any Standard Insulator.Holds all types of UHF and VHF wire separatelyor in combination with flat wire.

R I I 3°?

5 i 3

911 -:6R4

?1..t5

°RI I

Rt 1 ,3

R

Write for full information.parker METAL GOODS CO.85 Prescott St., Worcester, Mass.

. . . :or more details circle 34 on postcard

TECHNICIANS . . . Open theDoor to Greater TV Profits

Rebuild Color - Blackand White - Bonded FaceTelevision Picture Tubes in

YOUR OWN SHOP

Send today for 16 pagebrochure describing howyou can capture the tel-evision picture tube re-building market in yourarea. Low investment of$3,290.00 and up. Fi-nancing available. Train-ing at our plant includedin low price. Get startedtoday toward greater profittomorrow.

VACATION BONUSWhen on vacation, plan tostop by and see a com-plete demonstration. Ifpurchase is made whileyou are here Windsor willpay equivalent to yourtourist rate plane farefrom your U. S. home andback with the exceptionof Alaska and Hawaii.

WINDSOR ELECTRONICS, INC.Equipment Division

999 N. Main St., Glen Ellyn, Illinois


AUGUST 1965 87

LEARN

ELECTRONICS

FROM A -Z

AT HOMEHere's a complete self -training guidecovering all the fundamentals youneed to know for successful work inelectronic circuits, including radio,television, industrial electronics andcomputers. Following basic coverageof electrons and electricity, the bookclearly explains d -c circuits, magne-tism, a -c circuits, vacuum tubes, andtransistors. For each topic covered,examples are given that show howprinciples are applied to actual situa-tions.

BASICELECTRONICS

NEW SECOND EDITIONBERNARD GROBRCA INSTITUTES, N.Y.

660 PAGES, $10.50

Enlarged and revised, this SecondEdition gives basic principles and ap-plications of today's electronics. Sepa-rate treatments of Ohm's law, seriescircuits, parallel circuits, and series-parallel circuits show how to applyd -c fundamentals. Electro-magneticconduction, inductive reactance andcapacitive reactance are described,with all their uses in a -c circuits.Included are two new chapters on net-work theorems and complex numbers.

BUY THIS BOOK AT YOUR BOOKSTOREOR MAIL THIS COUPON

McGRAW-HILL BOOK CO., Dept. 23 -ET -85330 WEST 42 Street, N.Y., N.Y. 10036Send me Bernard Grob'sBASIC ELECTRONICS, Second Editionfor 10 days on approval. In 10 days I willremit $10.50 plus a few cents for deliverycosts, or return book postpaid. SAVEMONEY: We pay delivery costs if youremit with coupon; same examination andreturn privilege.

NAME (print)

ADDRESS

CITY

STATE ZIP

For price outside U.S., 23 -ET -85write McGraw-Hill Iraq., N.Y. 10036

ADVERTISERS INDEX

Alliance Manufacturing Co. 74

Allied Radio 37-38 39

Amperex Electronic Corp 3rd Cover

Amphenol Distributor Div. 19

Armco Steel Corp. 65

B 8 K Manufacturing Co. 67

Blonder -Tongue Laboratories 22

Brach Manufacturing Corp. 80

Bussmann Mfg. Division 84-85

Castle TV Tuner Service, Inc. 26

Channel Master Corp. 27-28

Charles Engineering, Inc. .82

Cleveland Institute of Electronics 81

Delco Radio Division 83

Electronics Marketing Div., Essex WireCorp. 76

Finney Company 73

GC Electronics Company 77

Heath Company 86

Hickok Electrical Instrument Co. 75

Jerrold Electronics 2nd Cover

Jerrold Electronics 36

JFD Electronics Corp. 33

LTV University 78

McGraw-Hill Book Co. 88

Miller Company, J. W. .80

Parker Metal Goods Co. .87

Philco Corporation .20

Pomona Electronics Co.

Quam-Nichols Company

Quietrole Company

78

26

88

Radio Corporation of AmericaRCA Electronic Components

Devices 4th Cover

RCA Sales Corporation 25

RCA Semiconductor Distributor Products 35

Rohn Manufacturing Co. 79

Sarkes Tarzian Tuner Service Div. 40

Sencore, Inc. 29

Sencore, Inc. 32

Sprague Products Company 23

Triplett Electrical Instrument Co. 82

TV Tuner Service 88

Ungar Electric Tools :4Weller Electric Corp. 70

Windsor Electronics E7

Winegard Company 3031

Zenith Sales Corp. 69

For Electronic Servicing

HARMLESS

T

PLASTICS

MARK -IIFor Tuners

SPRAY -PACKFor Controls & Switches

SILITRON rFor General Use

Zero effects on capacityand resistance. Non-

inflammable...non-conductive...non -corrosive. All include

free five -inch plastic extender.Yes! Ouietrole is still availablein bottles with an eye dropper!

manufactured by

.:QUIETROLE COMPANY

Spartanburg, South Carolina

... for more details circle 38 on postcarc

ATTENTIONALL T. V. TUNERS

Beware of T. V. Tuner Service as

they will replace all of your defectiveparts, align you to exacting originalspecifications and warranty you for90 days.

All This fto nrFor Only 017D

plusmajorports

Try our service and prove to yourselfhow it feels to be revitalised andstrong once again.

Pack yourself up and ship yourselfout today,

.:.:

71._JINJR:. Box 793 ET - Twin Falls, Idaho


MOVING?Be Be sure to let us know yournew address. Please enclosea complete addressfrom one of your recentissues.


for more details circle 12 on postcard

PICK ANY NUMBERFROM 1G3GT TO 19AU4

AND YOU'RE A WINNER!

10307/1B3GT 4HA5 6B76 6GW8 8CW5

1X2B 5HG8 6CB6A 6HA5 9A8

3BZ6 5U8 6CG7 6HG8 10CW5

3CB6 68L5 6DT6 6S4A 12AT7

3GK5 6AU4GTA 6E87 6SN7GT8 12AU7A

3HA5 6AU6A 6EJ7 6U8A 12AX43TB

4BL8 6AV6 6GB5 6U9 12AX7(

4EH7 6AX4GTB 6GJ7 6X9 15CW5

4EJ7 6BA6 6G85 6Y9 16A8

4085 6BL8 6086 8B05 19AU4

...AND ON AND ON. FOR THE COAPLETE LIST, WRITE

AMPERE( ELECTRONIC CORPORATION, HICKSVILLE, L.I., NEW YORK 11802.

RCA announces a zero defects program

through...

ersonal

uality

erformance

RCA's effort to apply some of the concepts of missile -type

reliability to the production of commercial receiving tubesYou lose time and money whenever a tube fails.To minimize such losses, RCA has initiated still another quality control measure to guardagainst tube failure and keep profits in your pocket.It's our ZERO DEFECTS program, an attempt to eliminate as far as possible the factor ofhuman error from commercial receiving tube production.RCA personnel engaged in the production of RCA receiving tubes have voluntarily signed apledge of PERSONAL QUALITY PERFORMANCE...a pledge to strive for error -free perform-ance in every task they undertake in the making of RCA receiving tubes.Their pledge is one more assurance to you of tube reliability and greatest possible reductionin callbacks when you sell and install RCA receiving tubes.

RCA Electronic Components and Devices. Harrison, N.J.

.1

The Most Trusted Name in Electronics

ELECTRONIC TECHNICIAN...ELECTRONIC TECHNICIAN WORLD'S LARGEST ELECTRONIC TRADE CIRCULATION AUGUST...

Documents

Transcript of ELECTRONIC TECHNICIAN...ELECTRONIC TECHNICIAN WORLD'S LARGEST ELECTRONIC TRADE CIRCULATION AUGUST...