ELECTRONIC TECHNICIAN...35791 TO ELECTRONIC TECHNICIAN, 1 EAST FIRST STREET, DULUTH 2, MINNESOTA....

N

ELECTRONICTECHNICIAN

COLOR TV FROM A TO Z PAGE 22AUGUST 1962

60

Tips for TechniciansDistributor Division. P. R. Mallory & Co. Inc.

P. 0. Box 1558, Indianapolis 6. Indiana

Why some filter capacitors develop hum ...and some don't

I Aluminum electrolytic capaci-tors are widely used as filters inDC Power Supplies. This is be-cause of their large capacitancein relatively small size. All inall, they do an efficient job of

I I reducing ripple (hum) to ac-ceptable levels.

However, all electrolytic capacitors arenot alike. This is often why some types

seem to allow hum to rise to objectionable levels morequickly than do others. In order to understand why, wemust investigate actual construction methods.As you know, electrolytics are basically made by depositinga film of aluminum oxide on aluminum foil to form thepositive anode. The oxide is the dielectric. A semi -liquidelectrolyte surrounds the anode and is actually the negativecathode. In order to connect this semi -liquid cathode to aterminal, a second piece of aluminum foil is used. This isoften called the cathode, but it is not. It is actually onlythe cathodic connection. (The preceding describes a "polar-ized" electrolytic capacitor.)When high ripple currents are applied to polarized electro-lytics, a thin oxide film forms on the so-called "cathode".It begins to assume the characteristics of a second anode.This in turn, has the same effect as placing two capacitorsin series. Consequently, overall capacitance is reduced.Inevitably hum increases.This action is especially noticeable in electrolyticswhich useplain foil as the "cathode". This is simply because the oxidebuilds up over a relatively small area.Mallory avoids this problem by etching the "cathode" onelectrolytics. As a result, oxide build-up is spread over avastly increased area. Therefore, ripple currents are main-tained at very low levels for very long time periods.Of course etched "cathodes" cost a lot more to make. Butyou get them from Mallory at no extra cost. There's muchmore to the Mallory capacitor story, but we'll leave thatto another TIP.Meanwhile, see your local Franchised Mallory Distributorfor capacitors, resistors, controls, switches, semiconductors,and batteries. In fact, he's the man to see for all of yourelectronic component requirements.

. . . for more details circle 33 on page 46

Sells best becauseit works best

TRANSISTOR

POWERMATEBY FAR THE BEST antenna preamplifier in thebusiness-that's POWERMATE! On black -and -white, and where it really counts-on color TV-POWERMATE's superiority fihows up across thecountry.

The better VSWR (impedance match), flat re-sponse, ultra -high gain, special broad -band neutral-izing transformer, and better power -supply filter -

PREAMPLIFIER

ing-all add up to an outstanding product. Nopolarity problems . . . no call-backs . . . transistorprotected from lightning -coupled surges . . . remotea -c power supply feeds 2 sets.

Step up to POWERMATE, and step up to a tre-mendous new profit opportunity. See your Jerrolddistributor now.

Model APM-1O1 $39.95 list, complete

JERROLD ELECTRONICS CORPORATIONDistributor Sales Division, Dept. IDS -243, Philadelphia 32, Pa.

Jerrold Electronics (Canada) Ltd., Toronto Export: CBS International, New York 22, N. Y.

. . . For more details circle 30 on page 46AUGUST 1962 3

Tarzian offers

FAST, DEPENDABLE

TUNER

REPAIR SERVICE

ALL

MAKES

It just makes sense that a manufacturer of tuners shouldbe better -qualified, better -equipped to offer the most de-pendable tuner repair and overhaul service.

Sarkes Tarzian, Inc., pioneer in the tuner business,maintains a complete, well-equipped Factory Service Dept.-assisted by Engineering personnel-and staffed by spe-cialized technicians who handle ONLY tuner repairs . . .

on ALL makes and models.Tarzian-made tuners received one day will be shipped

out the next. There is a 12 -month guarantee against defec-tive workmanship and parts failure due to normal usage.And compare our cost of $8.50 and $15 for UV combina-tions. There is absolutely no additional, hidden charge forANY parts except tubes. Replacementh available at lowcost on tuners beyond practical repair.

Tarzian-made tuners are identified by this stamping.When inquiring about service on other tuners, alwaysgive tube complement . . . shaft length . . . filament . . .

voltage . . . series or shunt heater . . . IF frequency . . .

chassis identification. All tuners repaired on approved,open accounts. Check with your local distributor forSarkes Tarzian replacement tuners, replacement parts, orrepair service.

SERVICE MANAGER TUNER DIVISION DEPT. 3A

\ISARKES TARZIAN INCeast hillside drive bloomington, indiana

edison 2-7251

MANUFACTURERS OF TUNERS . . . SEMICONDUCTORS . . AIR

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See your distributor, oruse this address for fast,

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4ELECTRONIC TECHNICIAN

WORLD'S LARGEST

ELECTRONIC TRADE

CIRCULATION

HOWARD A. REED

ALBERT J. FORMAN

JACK HOBBS

VICTOR L. BELL

WARREN CREWS

JACK O'CONNOR

JERROLD PATTERSON

RON KIPP

EARL HINTZ

Publisher

Editor

Managing Editor

Technical Editor

Associate Editor

Assistant Editor

Assistant Editor

Sales Manager

Production Manager

MAGGIE KANE Advertising Production

HOWARD SIVERTSON Art DirectorHERB HOENE Circulation Manager

AN 0J18WAYPUBLICATION

OJIBWAY PRESS, Inc.1 East First StreetDuluth 2, Minn.

Telephone: RA 7-8511

Sales Offices:

NEW YORK: Ron Kipp, 480 LexingtonAve., New York 17, N. Y. TN 7-0011CHICAGO: Willian Klusack, 221 N.LaSalle St., Chicago 1, III. CE 6-1600

CLEVELAND- Bernie Edstrom, 15605Madison Ave., Cleveland 7, OhioLA 1-7900

LOS ANGELES Boyd B. Garrigan,1145 W Sixth St., Los Angeles 17, Calif.HU 2-2838

ELECTRONIC TECHNICIAN and Circuit Di-gests. published monthly at 1 East FirstStreet, Duluth 2 Minnesota, by ElectronicTechnician, Inc., a subsidiary of OjibwayPress, Inc., Marshall Reinig, president; Rob-ert Edgell, executive vice president; Law-rence Rosenthal, vice president; H B.Fryberger, Jr., secretary; E. A. Kuefner,treasurer. Single copies, 60c. Subscriptionrates United States and Canada $5 forone year; S8 for two years; SIO for threeyears Pan American and Foreign countries,S9 for one year; S14 for two years; $18for three years With subscription correspond-

includ mailing label from most recentissue. Second-class postage paid at Waseca,Minn. Copyright 1962 by Ojibway Press, Inc.,Duluth, Minn Reproduction and reprintingprohibited except by written authorization ofpublisher.POSTMASTER SEND NOTIFICATION (Form35791 TO ELECTRONIC TECHNICIAN, 1 EASTFIRST STREET, DULUTH 2, MINNESOTA.

ELECTRONICTECHNICIAN

August 1962 Vol. 75 No. 8

COVER More than two-thirds of NBC's evening schedule will be in color this autumn. Don'tmiss out on this growing market. Broadcast and receiving principles as well as color mixing,and circuit functions are described in the article beginning on page 22.

FEATURES

"Tuning in the Picture" 14

TV Manufacturers TecFnical Digest 16

ET Viewpoint 21

Color TV From A to Z 22by L. C. Powell

Know Your Decibels 27by Frederick E. Wuebker

Transistors The Easy Wayby William C. Caldwell

Your Stake In Color TV 33

Servicing Remote Controlled Garage Door Openers 34by F. A. Kenom

New Experimental Color TV Camera 39

"Tough Dog" Corner 40by H. L. Davidson M. G. Goldbert

Test Instruments for Bench and Caddy

Shop Hintsby Clyde Pearce, Wayne N. Potter, Sid Elliot, Nicholas B. Cook,Wolter Savelly, H. Leeper

DEPARTMENTS

30

42

44

Editor's Memo 6 Reps and Distributors 61

Letters to the Editor 8 Association News 62

Free Liteature 46 News of the industry 63

New Products 50 New Books 64

Advertisers Index 66

CIRCUIT DIGESTS PRECEDING BACK COVER

DELCO: Garage Door opener Receiver -Trans-mitter Models R59 and T -59-12V

ELECTROHOME: TV Chassis, Models Kimberlyand Kalmar

GENERAL ELECTRIC: Stereo Phonograph,Model RP2060A

MOTOROLA: Auto Radio, Models 202, 203,and 204

TRUETONE: TV Chassis 1095-232

ZENITH: Color TV Chassis 27KC20 and27KC200

AUGUST 1962 5

and not just any 12AX7A?All 12AX7A schematics look alike. And at first glance, all 12AX7A tubesalso look alike. Yet, the use of a Sonotone 12AX7A tube can make aworld of difference in performance.The 12AX7A, used in signal stages for high gain, has virtually becomethe standard in the low level stages of audio preamp circuits where noise,hum and tube microphonics become major problems. If you examine aSonotone 12AX7A closely, alongside another, you will see a significantdifference in construction. You will notice a trident shaped, tonguedstructural member at the top of the tube - called a "Damper Mica." Thetongue supports the two cathodes - acts like the leaf of a spring, absorb-ing the shock of external impact and vibration.As a result of this unique construction, the Sonotone 12AX7A is re-markably free from microphonic tendencies. It is also sturdier and morecapable of withstanding impact and vibration without physical damageor electrical malfunction.In addition, the Sonotone 12AX7A employs a coiled heater which re-stricts unwanted magnetic fields in the heater cathode assembly whenAC is used for the heater supply. This reduces the AC hum componentto a point where it is no longer necessary to use rectified and filteredheater supplies.Small wonder that the Sonotone 12AX7A is specified by the leadingmanufacturers of high fidelity amplifiers. It is their way of insuring thequality of their instruments.The next time you replace a 12AX7A, remember that not all of themare alike. There are enough distinctive qualities in the Sonotone 12AX7Ato make its choice a sure and safe one. That's the point about all Sonotonetubes-all have that extra something that spells better performance.In addition to the high -gain 12AX7A, Sonotone also features selectedquality audio output tubes-the EL34 and EL84-available in matchedpairs for push-pull applications.

Next time the schematic calls for the 12AX7A, or any type of tube forhome entertainment or industrial application - replace with Sonotone.

SONOTONE" CORPORATIONELECTRONIC APPLICATIONS DIVISION ELMSFORD, NEW YORKCartridges Speakers Tape Heads Mikes Electron Tubes Batteries Hearing Aids

. for more details circle 37 on page 46

6 ELECTRONIC TECHNICIAN

EDITOR'SMEMO

While driving to work the other day,a TV service truck whizzed by me. Notonly was he speeding, but he passedon a curve, just barely missing an on-coming car.

Frightening. Just think how TV techsare making hundreds of thousands ofhouse calls every day. Being on theroad so frequently means that you arerisking life and limb.

Consider that last year 37.600 peopledied and 3.057,000 were injured becauseof auto accidents. Based on the statisticsthe Automobile Manufacturers Associa-tion and The Travelers Insurance Com-pany, I estimate that at least one out-.side TV tech out of every 25 will beinjured in an auto accident this year,and more than one in every 2000 willbe killed while on the job, still moreon their own time.

Here are some figures which I hopewill be good cause for sober reflection.Collision with another auto produced39.1% of deaths. 74.7% of injuries; non -collision, 25.9% deaths. 10.1% injuries;striking pedestrian, 18.9% deaths, 7.7%injury; hitting fixed object, 11.4% deaths,5.4% injuries.

Driver error causes 82% of casualties.37.4% of injuries were caused by speed-ing. 22.1% by not having right-of-way,17.6% by reckless driving. 8.8% by driv-ing off roadway, 7.1% on wrong sideof road (16.9% of deaths this way), 2.6%cutting in, and 2% failing to signal.

Drivers 25 years old and under areinvolved in about one-third of all fa-talities, though they account for only19% of all drivers.

Don't blame women drivers for theroad mayhem, either. Though 39% ofall drivers are females, the ladies drivein only 13.4% of fatal accidents and19.8% of non -fatal accidents.

Get seat belts, take it easy on theroad. Act as if your life depended onit. It does.

Remember this epitaph:

Here lies the body of William Jay,Who died maintaining his right of

way;He was right, dead right, as he spedalong,But he's just as dead as if he'd been

wrong.

Tiny, tough, dependable.Silvered flat -plate constructionfor high by-pass efficiency,high self -resonant frequency.Available in the followingtypes to meet specific require-ments: General Application, for by-

pass and coupling High -K, for applications re-

quiring guaranteed mini-mum capacitance values

Temperature-Stable, forminimum capacitancechange with temperature

"UNIVERSAL"CAPACITORSHave multiple leads.

Quick -fix capacitors for on -the -spot repairs. By usingcertain leads for terminals,connecting certain leads to-gether, and removing cer-tain leads, various ratingsmay be obtained. Availablein General Application aswell as High -K types.

SPRAGUE

CERAMIC

CAPACITORS

THE Complete LINE THAT OFFERS

MORE THAN MERE "CAPACITY""Rated" capacitance is not

enough . . . actual capacitanceduring operation is equally im-pc rtant. Excessively high or lowvalues as well as capacitancechange with temperature canfoul up a TV or radio set.Therefore, characteristics suchas Capacitance Stability, Capac-itance Tolerance, and Tem-perature Coefficient cf Capaci-tance must be considered in re-placement applications.

CERA-MITE CAPACITORS Temperature-Compensating,

for applications requiringnegative temperature coef-ficient

NPO, for use where capaci-tance change with temr era-ture is undesirable

AC, rated at 125 VAC Bider, rated at 2000 WVDC

Leu--voltage, for by-pass andcowling in transistorizedcircuitry

TV Yoke, rated at 3000 and5000 WVDC

BULPLATE®CAPACITORS

Rugged multiple -sectionunits which combine in onecompact assembly all the ca-pacitors used in one or morestages of a radio circuit. Thesespace -saving capacitors areideal for miniature sets.

DOORKNOBCAPACITORS

Available in 20 and 30 KVratings. Molded guard ringslengthen surface creepagepath. Complete with varietyof screw -in terminals tomeet all replacement re-quirements.

WORLD'S LARGES1 CAPACITOR MANUFACTURER

'at's why the Sprague Ce-raraic Line is varied and broad-i: includes capacitors withele.:trical and mechanical char-acteristics to meet practicallyevery replacement requirement.

See complete listings in thenew Sprague Catalog C-614.Get your copy from any SpragueDistributor, or write to SpraguePrc ducts Co., 65 Marshall St.,North Adams, Massachusetts.

HYPERCON®CAPACITORS

Ultra-miniaturediscs foruse in transistorized

cir-passcuitry. Designed for by -and coupling

appli-cations in low voltage cir-cuits where high capaci-tance and low power factor are im-portant considerations.Superiorin

rasi:e and performanceto com-pably-rated

aluminum electro-lytic capacitors.

BUTTONHEADCAPACITORS

Screw -mounting unitswith flat disc capacitor ele-ments seated in hexagonhead. This series includesfeed-thru capacitors for fil-tering leads through chassis,as well as standoff capaci-tors for by-pass applica-tions.

SPRAGUE'THE MARK OF RELIABILITY

AUGUST 1962


7

For Big Profits Doing This...

...Use These:Whether it's hi-fi in the home, or CBin car, boat, truck, or taxi, custominstallation jobs jump into thebig -profit category when you deliverhigh quality at low cost.And especially with EICO kits, whichaverage 40% less than our own, low,wired prices. Wire 'em up yourselfand pocket the difference-with yourcustomer's blessing, because if youbuild the components yourself, it'scustom-made all the way through!But kit or wired, EICO's all-out,no -compromise engineering, EICO'sstrikingly dramatic beauty, andEICO's fantastically low pricesprovide all the ingredients necessaryfor big profits on custom jobs. To putit simply: You Profit fromEICO Excellence.

Deluxe Citizens Band Transceivers .Kit Wired

#770: 117 VAC only $79.95 $109.95#771: 117 VAC and 6 VDC 89.95 119.95#772: 117 VAC and 12 VDC 89.95 119.95

NEW TRANSISTORIZEDSTEREO/MONO 4 -TRACK

TAPE DECK RP100Semikit $299.95 Wired $399.95Luggage -type Carrying Case $29.95

Standard 19 -inch Rack Mount $9.95

S

11)

STEREO FM FM MULTIPLEX TUNER ST97Semi -Kit ,$99.95 Wired $149.95

Includes metal cover and FET.

FM/AM STEREO TUNER ST96Kit $89.95 Wired $129.95

Includes metal cover and FET.

4: 4®

70 -WATT INTEGRATEDSTEREO AMPLIFIER ST70

Kit $99.95 Wired $149.95Includes metal cover and FET

40 -WATT INTEGRATEDSTEREO AMPLIFIER ST40

Kit $79.95 Wired $129.95Includes metal cover and FET.

Rely on EICO Excellence for your test equipment too:

AC VTVM &AMPLIFIER#250Kit $49.95Wired $79.95

TRANSISTORAND CIRCUITTESTER *680

Kit $25.95Wired $39.95 3 . g

examommipik

IN -CIRCUITCAPACITORTESTER #955

Kit $19.95Wired $39.95

For complete catalog of ove 106 EICO kits and w.red units-hi.fi, test equipment,citizens radio, ham gear -plus name of nearest distributor, write to dept ET -8

EICO ELECTRONIC INSTRUMENT CO., INC., 3300 Northern Blvd., L.I.C. 1, N.Y.Export Dept.,Roburn Agencies Inc., 421 Creenwi,:h Street, New York 13, N. Y.

LETTERSTO THE EDITOR

Double Leverage

EDITOR, ELECTRONIC TECHNICIAN:

I have found that frozen powderediron core slugs in transformers and coilscan be freed by using one alignment toolat each end of the coil. This providestwice the force which will almost alwaysfree the slug . . . I believe a goodplastic tool is less likely to break theslug than an Allen wrench.

GERALD MOCK

Norwalk, Calif.

This should work fine with single -slug coils having adjustment notches inboth ends of the slug.-Ed.

Union vs Licensing


I have been reading your magazinesteadily for 3 years. Also I have seenmany of your older issues. Always thereis the same old story: licensing, yes!and licensing, no! I have had it fullup with this old baloney! . . . What wedo need can be told in one five letterword: U -N -I -O -N. That's right, a good,strong, honest, powerful union. The onething that is necessary is to set mini-mum prices on service calls and labor.Believe me, licensing is not the an-swer . . . .

ARNOLD WAXMAN

Detroit Mich.

Technician's Co-op


I am pleased to announce the forma-tion of a new Co-operative. I believeit will fill the void for those discrimi-nating television servicemen, desiriousof associating themselves with an or-ganization designed to protect them andto assure good working conditions andstill belong to a Co-operative and tech-nical society of men, well trained intheir fields. Regretfully, certain presentgroups admit anyone regardless of theirqualifications or sincerity of purpose. . . . The group will be known asthe "Professional Electronic TechniciansEngineering Co-operative," or simply"PETEC."

D. W. CooK, Executive Director

Kenmore, N. Y.

Monophonic Minded


I recently heard that ELECTRONIC

8

. . . for more details circle 22 on page 46ELECTRONIC TECHNICIAN

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improves reception for additional TV, color TV, FM, stereo FMprovides most efficient signal deliveryautomatically matches impedanceproved in more than 50,000 installationssnaps on without toolseliminates extra antennas, rabbit earspackaged and designed for consumer appealmore than 2 million new customers annually

Foolproof, simple, rugged TRANSCEPTOR was de-signed especially for the fifteen million multiple -set owners inthis country. Now, with easy -to -install TRANSCEPTOR, theycan run any combination of TV and FM sets - two or more, oneat a time or all at once - off one antenna without amplification innormal signal areas. And, because TRANSCEPTOR uses elec-tro-magnetic pick-up instead of resistance splitting of the signal,the line is not cut, there is minimum signal loss, and better set-to -set isolation.Result: More customer satisfaction. More sales. More profits.

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JULY 1962

- - for more details circle 46 on page 46

9

ELECTRONICS

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SEPTEMBER TUNE-UP SPECTACULAR is yourcampaign. It's easy to tie in. Proven effective.No red tape. Get full details from your G -E tubedistributor, now. Names of participating dealersmust be in by August 27. General ElectricCompany, Distributor Sales, Electronic Compo-nents Division, Room 1748, Owensboro, Ky.

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GENERAL ELECTRIC. for more details circle 26 on page 46

AUGUST 1962

ArcolyticAvailable from all authorized ARCO distributors

CTM 3410

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P10 MFD 350 WVDC

-20 MFD 25 VIVDC

*CO ELECTRONICS, INtMADE IAI U S A

1401 Values ...The largestselection of exact replacement

twist -mount & tubular electrolyticsI 99.99% high purity aluminum foil electrolytics at no extra cost! Choose fromstock any single, dual, triple or quadruple capacitance - voltage combination forreplacement in television, radio, and other electronic equipment Made to with-stand high ripple and high surge voltages Designed for 85°C high temperatureoperation Greater shelf and operating life because only premium grade ingredientsare used Built and tested to meet EIA Specification RS -154 Individually pack-aged with mounting plates for your convenience Unconditionally Guaranteed.

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electronicCommunity Drive, Great Neck, New York HUnter 10500

it- LETTERSTO THE EDITOR

TECHNICIAN Magazine will again publishits annual stereo issue in September.Stereo, I believe, is nothing more thana "gimmick" to squeeze more moneyfrom recorded music lovers. Please bearwith me a moment while I express mypersonal views.

I believe you can readily agree thatonly a small percentage of the populationis interested in true Hi-Fi. An evensmaller percentage can' afford it. Masssales over the past few years can be at-tributed to high-pressure psychologicalselling jobs and a desire of the publicto "keep up with the Joneses."

When the Hi-Fi boom of the '50s be-gan to fade, it became "fashionable" toown stereo equipment-a "new salesapproach" concocted by some of MadisonAvenue's "super salesmen." Now thatstereo is slipping, (ET "Tuning in thePicture," July), it is only logical to in-quire: What new "serum" is beingbrewed to give the audio industry another"shot -in -the -arm?"

Rock -'n -Roll - usually recordedthrough echo equipment from a closet-can he reproduced through a cheap a -mradio with little or no bad results. Butthe great music of today and the pastwas written so that every note from anumber of orchestral instruments wouldblend and reproduce pleasant overtones.

To me, the most pleasing sounds froma live concert are those heard at therear of a well designed concert hall-notwhile sitting directly in front of or ontop of the orchestra.

There is no discernible separation of in-struments at a reasonable distance froman orchestra. Stereo, however, is re-corded by placing microphones near theperformers. Of course this would not beobjectionable if the playback was ren-dered under precise recording conditions:with the listener's seat placed far backfrom the loudspeakers. But this cannothe done in small rooms.

Hi-Fi manufacturers were alreadymaking significant progress in the direc-tion of realism in music reproduction be-fore stereo. And monophonic repro-duction requires less precise seating, lessequipment and it reproduces the originalperformance more faithfully.

I wonder how much further along wewould be in true life -like Hi-Fi if stereohad not stymied monophonic researchand development? It is generally ack-nowledged that response is sacrificed inmost stereo recording techniques.

Let's call off this slaughter of goodmusic and return to logical methodsof reproducing music: With a singlechannel system. No, it won't reproducethe effect of a passing locomotive, or acovered wagon train in a "stereophonicmovie," but it will reproduce music as itactually sounds in a concert hall.

E. M. FRICKERT

New York, N. Y.. . for more details circle 11 on page 46


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AUGUST 1962


13

AN ELECTRONIC BETTING SYSTEM enabling pa-trons at parimutuel race tracks to place bets withoutqueuing up at betting windows is being demonstratedin operaaion. The patron drops a pre -purchased ticketof any denomination into a machine, punches onebutton to indicate the horse of his choice, and a secondto indicate which position he expects that horse tofinish. By means of punched holes, the machine in-stantly registers on the ticket, the horse and positionbet, the date and the number of the race. The ma-chine passes this information on by means of elec-tronic impulses to the Central Station.

MICROFORM SPHERES as small as 0.0003 -in. indiameter, 1/10th the diameter of a human hair, arebelieved to be the world's smallest manufactured part.The spheres, produced by Anchor Alloys, are usedas junctions and doping agents in the manufactureof transistors and other electronic components. An-chor's research section has developed new sorting tech-niques to assure consistency of specified sizes, in thecase of 0.003 -in. spheres, to a range of ±0.0001 -in.

Vapor Circuits

Thin-film microcircuits are formed on a high -strength ceramic wafersmaller than a postage stamp and one -hundredth of an inch thick byvaporizing materials with intense heat in a high -vacuum chamber. ASylvania pilot production line operator is shown loading a circuitwafer into a mask holder alignment fixture on the evaporator priorto processing. Hundreds of custom-built microcircuits can be pro-duced daily for military application.

"Say look, do yot. suppose weend of the month?"

could extend my repair bill until the

SPACE AGE COMPUTERS may some day help doc-tors understand complexities of the human brain. Andconversely, the medical professional achievements inneurology and psychology may help engineers builda machine that thinks for itself. This electronic -bio-medicine relationship was the main topic at a con-ference in Chicago sponsored by the Office of NavalResearch and the Armour Research Foundation of.Illinois Institute of Technology.

NAB PRESIDENT, LeRoy Collins, named nine lead-ing broadcasters as members of the Television CodeReview Board of the NAB. The Review Board servesas the appellate body in administering the NAB Tele-vision Code which is the guide to TV stations andnetworks in their programming and commercial pres-entations.

A BREADBOARDING DEVICE manufactured byCircuit Structure Labs, fits into an attache case forquick assembly of experimental circuits without the


use of solder or spring clips. It measures 81/2 x 11in. and contains 130 junction cells on 3/4 in. centersin 10 rows of 13 cells. Each gold-plated brass cellhas an elastic rubber core protruding through it andcan accommodate up to seven component pigtails. Thelightweight board is letter and number coded for ef-ficient organization of circuit modules.

SCIENTISTS take their first careful look at a differ-ent kind of light from the stars. Observations will bemade in space from Aerobee rockets launched by theNational Aeronautics and Space Administration andcould lead to a better understanding of the nature ofthe universe. The experiments, planned by physicistsat Lockheed Missiles & Space Co. labs, will studysoft X-rays, a part of the light spectrum just belowthe ultra -violet in wave length. Soft X-rays are thosebetween 100 v and 16,000 v sent out from very hotparts of stars, from very hot stars, or other objects.

ELECTRONIC DISTILLATION of "Great Books ofthe Western World," will be performed for visitors atthe Seattle World's Fair by a UNIVAC solid-statecomputing system. Excerpts from great literary works

The TV Man

Amommu11111,115The. "Tv Man

nom,The:Tv Mna" is helpful.

We rvizecl his services.He, may put in' a new +ul,e.

e_ may Gtol3'v.4 Q p 0. r+We are 3Iad vsilletn he Comes.

Then, we IA- mi;E, rrlD3rarrt

What a second -grade class thinks of TV -radio technicians of onecommunity was clearly demonstrated on a school -room blackboardrecently in a Maryland town. Another class put the "TV Man" on amap of the town. A field visit to the TV shop or a visit to theschool by a local TV technician is frequently noted with interest bygrade schoolers

CALENDAR OF COMING EVENTS

Augus- 21-24: WESCON, Western Electronics Show and Con-ference, Sports Arena, Los Angeles, Calif.

August 20-28: EIA Annual Maintainability Conference, Univer-sity of Colorado, Boulder, Colo.

August 31 -Sept. 9: 1962 iAlorld's Fair of Music, McCormick place,Chicago, Ill.

October 1-3) 8th National Communications Symposium, HotelUtica 3 Municipal Aud., Utica, N. Y.

October 8-10: National Electronics Conference, McCormickPlace, Chicago, Ill.

November 12.14: Radio Fall Meeting, King Edward Hotel, Toronto,Ont., Canada.

November 13-15: NEREM (Northeast Res 8 Engineering Meeting),Boston, Mass.

December 6-7: PGVC (PG on Vehicular Communications) Confer.ence, to Hotel, Los Angeles, Calif.

on the subject of "Man-The Differences and Rela-tions Between Men and Women," and five other sub-jects will be supplied on a high-speed print-out systemwithin seconds after a request is made. The computeris installed at the American Library Association "Li-brary 21" exhibit.

BATTERY POWERED fluorescent lamps give a mini-mum of 15 continuous hours of light at an intensityequivalent to a 50 w incandescent lamp. The flash-light -battery operated lamp is expected to prove usefulfor power failure emergencies, mining operations, air-craft maintenance, pleasure boating, camping, andmany other applications. The self-contained fluorescentlamp was developed by IT&T engineers.

NUCLEAR ENERGY was used to detect a pipelineleak at the Pan American Airways hangar when allstandard methods for detecting the leak were foundinadequate. A task force from Tracerlab, a divisionof Laboratory For Electronics, Inc., imbedded a ra-dioactive source containing Cobalt 60 in a 3/4 in. di-ameter ball. To keep it free flowing, the ball was suf-ficiently weighted. Alter the ball was introduced intothe leaking solvent, its progress was watched with aradiation monitor. When the ball s:opped moving it wasassumed it had reached the point of leakage. Thiswas confirmed when the exposed pipe was inspected.The ball was easily retrieved and the entire operationtook less than one hour.

AUGUST 1962 15

NY Pr ...***1

TV MANUFACTURERS TECHNICAL DIGESTIf 1

tr1117$4.10y04,1 t4 0 0 L)r t)h YU, 11t1

11.7:, PeIV P

[SW c.a. cnc rc FUTIJI

EMERSON

Record Changer Model 81981 - Tone Arm Adjustments

The lift adjusting screw is accessible through ahole in the top of the tone arm. It should be adjusteduntil the tone arm clears the bottom of a record on

Stylus set down and tone arm height adjustments.

the spindle shell by 1/8 to IA in. when the changeris in cycle. A clockwise adjustment raises the arm, coun-terclockwise lowers it.

The set -down screw is accessible through a holt.'in the left side of the tone arm. It should be adjustedfor proper stylus setdown on a ten inch record; sevenand 12 in. records should require no additional ad-justments. The set -down point is moved away fromthe spindle by counterclockwise adjustment and to-ward the spindle by a clockwise adjustment.

GENERAL ELECTRIC

TV CHASSIS M579 - Z Code Production Changes

1. Audio take -off transformer T154 and 4.5 metrap should be changed from No. R4953 to No.R5809.2. C169 should be changed to 68 pf.3. C176 should be added. It is part of the R5809transformer.4. C175 should be added.

JUIA_ Ti A L.J=-T,-;':

T154AUDIO TAKE -OFF

844.5 MC TRAP

C16968

C1763.3

C I 7 5 47TO PIN IOF V7

New circuit for G -E TV chassis M579 audio take -off circuit

MOTOROLA

113038 VHF Tuner - Improved Oscillator Stability

Oscillator stability in these tuners can be improvedby the following modification:

1. Change V2 from 4BL8 to 5EA8.2. Change C14 from 10 pf, N150 to 10 pf, N250.

Regeneration is eliminated by the addition of capacitor at UHF input

TT305Y8 VHF -UHF Tuner - To Eliminate Possible Regeneration

Possible regeneration in this tuner is eliminatedby adding C28, a 15pf, 10% capacittor in paral-lel with the UHF input.

TT307YB VHF -UHF Tuner - Elimination of Drift Caused byMoisture

To eliminate the possibility of excessive initial os-cillator drift caused by moisture accumulation, the fol-lowing changes. should be made:


NEW LOW PRICES -ONLY CHANGE WE COULD THINK OF

TO MAKE THESE SPEAKERS SOUND BETTER THAN EVER!

simply say DelcoYou've always been able to install Delco Auto Radio Speakerswith complete confidence in their quality. Now you can sellthis popular line at competitive prices as well!

And Delco hasn't sacrificed a single one of these out-standing features: Highest sensitivity for greater range ofdistortion -free sound from precision -engineered magneticcircuits Extra -efficient, premium grade Alnico -V magnets Continuous life testing program to assure dependable

performance under the most severe climatic conditions.

There's news in Delco packaging, too. Your choice 6 x 9'sin new bulk -packs, 20 speakers to a carton, or individuallyboxed speakers if you like. Now that you can sell top qualityDelco Auto Radio Speakers at new, competitive prices, betterstock up and start cashing in! Call your supplier and-simplysay Delco. Delco Radio Service Parts aredistributed nationally through United Delco.

DELCO RADIO, Division of General Motors, Kokomo, Indiana

INOAUGUST 1962

. . for more details circle 21 on page 46

17

MAKE BIG PROFITS!with 25 to 50 MC. Industrial

2 -WAY RADIO

THE "MESSENGER 202" DELIVERS THE PEP ANDPERFORMANCE NEEDED FOR SOLID COMMUNICA-TIONS-COMPLETE DEALER AID PROGRAM PUTS YOUINTO THIS PROFITABLE FIELD OVERNIGHT!The "Messenger 202" sells for less than $200.00-is priced withineasy reach of any business! A complete 10 -tube (including rectifier)crystal -controlled AM transceiver, the "202" is F.C.C. type acceptedfor use in the Industrial, Public Safety, and Land Transportationservice. The "202" practically sells itself when you point out thesavings that almost any business or municipal organization canmake with this top performing, low cost industrial equipment!Highly selective and sensitive superheterodyne receiver, built-in"Squelch," and AVC, ANL circuits. Designed for easy operation-fast, smooth installation-and simplified maintenance. Availablenationally from E. F. Johnson Company distributors. Powerful dealeraid program shows you how to make big money in sales and servicein this highly profitable field-gives you everything you need tohandle your own line of industrial 2 -way radio equipment!

CONTACT YOURDISTRIBUTOR

or WRITE TODAYfor Full Details

E. F. JOHNSON CO.5607 Tenth Ave. S.W. Waseca, Minn.

Manufacturers of World s Mot Widel Used Personal Communications Transmitters


TV MANUFACTURERS

TECHNICAL DIGEST

I. Fine tuning coil part No. 24P65121A03changed to part No. 24P65120A13.2. To accommodate the fine tuning coil, oscillatorwafer part No. 1P65121A03 is changed to partNo. 1P65121A04.3. Plunger and coil assembly part No. 1P65121A-07 changed to part No. 1P65121A08.

PHILCO

RK-1 Reverb Kit - Improved Bass Performance

When the RK-1 reverb kit is installed in Hi-Fimodels K-1635, K -1636X and K-1638 a noticeable lossof bass control may occure. To improve the bass con-trol performance, coupling capacitors C3 and C4 inthe reverb unit should be changed from their presentvalue (0.01/4 to 820 pf).

IF YOU CHANGE YOUR ADDRESSNotify us at I East First Street, Duluth 2, Minn. Please

include the address label from a recent issue and allow30 days for the change.

NEW TUBE TYPES ARE REVOLUTIONIZING YOUR BUSINESS

NEW TUBE TESTER

MODERNIZING PANELNow, you can test all of these new tubes in theSencore Mighty Mite or any other tube testerexcept the "cardomatic" type. Don't throw awayyour tube tester just because you can't checkthe RCA Nuvistors. the GE Compactrons,the Sylvania 10 pin tubes or the all newRCA Novars.These new tubes, which are the industry'sanswer to the transistor, are causing arevolution in electronics today. Thousandsare being installed in electronic equipmentevery day from coast to coast. You will be calledon to test them tomorrow. Be prepared with theTM116 Tube Tester Modernizing Panel.

Tests are made by plugging the TN1116 into an octalsocket on your tester and setting controls from thechart provided with the unit. All tests are the sameas your tester now makes. Some other adaptor unitsmerely reduce all tests to an emission check. Sencoreuses additional internal circuitry to provide completemutual conductance or high grid leakage checks if

RCANOVARS

RCA

WSagroir

116

your testernow makes them.You can own the TM116for less money than it costs tokeep substitutes in your shop or lab.

$2495Model TM116 Dealer Net Only

Ask your Authorized Sencore Distributorfor the New TM116. He has them in stock. SENCORE

ADDISON, ILLINOIS. for more deta Is circle 36 on page 46

For thosespecialapplicationschoose aQuarn. speakerWhen you need a 2%" unit for a transistorradio-or a shallow 6" x 9" for a Thunderbirdreplacement-Quam has it!

When you need a special voice coil impedance orspecial field resistance-Quam has it!

Quam gives you the widest selection and thehighest quality in the entire speaker industry!Ask for Quam, the Quality line, for all yourspeaker needs.

6" x 9" Shallow SpeakerModel 69A1SActual Size

2%," Transistor Radio SpeakerModel 22A06Z8

Actual Size

QUAM-NICHOLS COMPANY226 N. Marquette RoadChicago 37, Illinois

AUGUST 1962


19

Type PM Molded Mylare/Type PKM Molded Paper-Mylar/Type WMF Mylar Wrap/Type DPMS Dipped Paper-Mylar

Pr f, 9C

Dealer Net $15.54

In your lifetime, you'll probablynever use all the 284

tubular bypass capacitors we make.

%It

;e`froe.

.111.11.

**ICJ' 4tIler *** griP411°Et

110' ig rgz-le leia

Nos

But you'll use these 2 kits every day.

Need a bypass capacitor? You know where to find it-in our 40 -page Service Selector or under "Cornell-Dubilier" in the Radio -Electronics Master. You knowwhere to get it, too-off the shelf, at your CDE Dis-tributor. And you know that the price is right-wehaven't been a leader in this industry for more thana half century without good reason.

But for your day-to-day needs, you're better off withthese two kits. Each contains 80 units, all 600 WVDC

'DuPont TM

C DfE

DPMS KIT

List Price $26.40

Dealer Net $15.84

and 10% tolerance. The large plastic case comesequipped with hinged cover, separate compartmentsand a durable selector chart. You pay only for thecapacitors...the case is free. Your CDE Distributorhas them in stock, too.

When it comes to bypass capacitors, you can affordto bypass all names except:CORNELL-DUBILIER ELECTRONICS, DIVISION OF FEDERALPACIFIC ELECTRIC COMPANY, 50 PARIS ST., NEWARK 1, N. J.

CORNELL-DUBILIER

the only Company that makes them all. . for more details circle 20 on page 4E.


I( ET VIEWPOINT

Color TV Is On The MoveColor TV sets sales should hit 450,000 units this

year. Some authorities think it will be closer to 400,-000 sets because of a shortage of color picture tubes.Either way it will be a good year for color.

We see 1963 as the year when color sales willcome close to 700,000 units. And 1964 should seethis volume push the million mark. That's big busi-ness. When you think that color sets in use accountfor less than 2% of all sets in homes, and fast risingcolor sales account for over 6% of all TV sales, TVservice dealers had better be prepared for a substantialmarket. By 1965 color will probably account for 15%of sales.

Now is the time for technicians to be preparedfor color. Start servicing now. Test instrument manu-facturers have an excellent variety of color test in-struments on the market, and the million sets now inuse offer a good starting point to be ready as colorbusiness expands.

Practically every set manufacturer is now sellingcolor sets. The few who are not will be making themby 1963.

The number of color programs on the air will bean important factor in accelerating color sales. NBC,which has retained a meaningful color programmingduring the lean years, is increasing color programsabout 30% next season to a total of over 2,000 hours.As a matter of fact, about two-thirds of NBC's eveningshows will be in color. ABC, which has lagged behind

the other two networks in the early color years, willstart a modest color schedule next season. No doubtthe emphasis here will be on color films. It is expectedthat CBS, which once did make a serious color effort,will be pressed to move into the field again.

In addition to network activity, over 100 localstations can originate color TV programs, and about70% can handle network -originated color programs.

Thousands of readers sell sets, as well as servicethem. There is an attractive profit margin in color.While profit margins on black -and -white might run15 to 25%, color margins more typically range between25 and 30%. And don't forget these percentages are ofa much higher dollar figure for color. How manyblack -and -white sets do you have to sell to make the$150 profit on one color sale?

In addition, the antenna requirements are morestringent with color, building up the sales and profitsfor antennas, transmission line, rotators and relateditems.

Still another attraction is that hourly rates forcolor servicing run higher than black and white.

There will be many new developments breakingthick and fast. New color tube designs are movingclose to the production stage. Imported Japanese colorTV sets have started in token numbers, and will beincreasing.

The important point is that the fellow who getsin there first will reap the major benefits.

Memo to EIA: Remember ServiceThe Electronic Industries Association has kicked

off a consumer electronics public relations program totell the story of the future of electronics in the Ameri-can home. The start is a four -session symposium on"What's Ahead for Consumer Electronics?" Topics in-clude what's ahead for educational TV, color TV,radio and phonographs.

We are disappointed by the absence of a sessionon, "What's Ahead for TV Service?" It should be re-

membered that consumers do not buy a new set yearin and year out. But they do have their set servicedyear in and year out.

EIA has an excellent Service Committee compris-ing the service managers of the various set manufac-turers. Certainly from among these capable peopleEIA could have come up with an interesting sessionto educate the consumer on a subject that is nearand dear to his heart - and pocketbook.

AUGUST 1962 21

Basic color transmission stardards;

chroma and sync circuit fundamentals

4 e.

Shops all over the country arepassing up color TV service profitsfor no good reason. If your shopis average, you're losing this busi-ness too. Many technicians turndown one or more color TV callseach week because they are afraidof problems beyond their experi-ence or training.

It is interesting to note in thisconnection that many of these sametechnicians began servicing B/WTV receivers with modest theoreti-cal training - some in the firstdays of TV - and they learnedby trial and error. Experience is

Fig. 1-The color TV cameradepends on an optical mul-tiplexing system to providelight of the proper color toeach camera tube. 'Halfmirrors' used in the cameraare front -surfaced to passonly half of the light andreflect the remainder.

still the primary catalyst of success.An understanding of basic colorprinciples and color circuit opera-tion is necessary, however, if youare to gain experience while mak-ing a minimum of errors.

Elementary Principles

All colors in the visible spectrumcome from white light. Conversely.of course, white light is composedof these colors. White light can bederived from mixing or blendingcertain percentages of three basiccolors. The three colors used incolor TV are red, green and blue.

TV

When these colors are mixed inquantities of 30 percent, 59 per-cent and 11 percent, respectively,white light is produced. This prin-ciple is used in the TV camera forcolor separation as well as in thereceiver for color and B/W repro-duction. By changing relative quan-tities of these primary colors a widerange of other colors can be pro-duced.

Each of these colors is selectedby optical filtering as shown in Fig.1. Blue filters appear blue becausethey let only blue light pass; redlets only red light pass and green

WHITELIGHTSOURCE

COLOREDOBJECT

III

1 11

RED FILTER

Ill HALF

OL :=XMIRRORS

GREEN FILTER

MIRROR

BLUE FILTER

MIRROR

BLUE SIGNAL

RED SIGNAL

) GREEN SIGNAL


From A to Z

passes only green light. Each of thethree separate camera tubes pick uponly the color reflected from ob-jects which will pass through its as-sociated filter. This information istransmitted to the receiver and re-produced. A deficiency in humanvision makes the reproduction ofmany colors possible by employingclosely positioned colored phosphordots on a CRT screen. By chang-ing the quantity of light from eachof the three primary color dots, theeye blends these to form colors likethose in the original scene. Con-struction principles of the standard

three gun color tube is shown inFig. 2.

Color Broadcast Standards

The National Television SystemCommittee (NTSC) established TVstandards before color telecastingbegan - which created problems.The biggest problem was insertingthe chroma or color information inthe alloted B/W 6 me wide band.If a portion of the B/W bandwidthwere used to allow addition ofcolor information, picture detailwould be impaired. This problemwas solved by interleaving or mul-

Fig. 2-Electron beams in the color CRT converge at the aperture maskand impinge on their respective phosphor dots on the screen. Byvarying the relative intensity of the three beams, phosphor illumina-tion changes the over-all screen color. The CRT screen dot pattern isvisible under magnification.

tiplexing color information betweenthe B/W information.

This is possible because the stand-ard monochrome signal informa-tion is contained in energy groupsthat are evenly spaced at harmonicsof the horizontal scan frequency.This is shown graphically in Fig.3.

Harmonics of half the horizontalfrequency fall between the scan fre-quency harmonics or video energypoints. This is where the chromainformation is inserted for telecast-ing. In order to minimize the in-terference to B/W receivers during

FREQUENCY IN MEGACYCLES

Fig. 3-The entire spectrum of one TV channel is composed of energybursts which are harmonics of the horizontal scan ,reguency. Colorinformation is interleaved between these harmonics at the high endof the channel.

AUGUST 1962 23

color broadcasts, the color subcar-rier is placed as high in the fre-quency band as possible becauseless picture information is transmit-ted at higher frequencies. Since thesound carrier is located on the highend of the band, 3.6 mc was setas the high limit for the color sub -carrier frequency. Interference fromsound carrier beat frequencies andthe nearest horizontal multiple,however, necessitated a slightchange. It was found that the in-terference was least objectional

when the sound carrier was a mul-tiple of the horizontal scan frequen-cy.

Changing the sound carrier tothis extent would not allow exist-ing B/W receivers to receive thesound, so the color horizontal scanfrequency became 15,734.6 kc -this made the 4.5 mc sound car-rier the 286th harmonic of the linefrequency. In order to maintain anormal two -to -one field interlace,the vertical frequency had to be59.94 cps. Both of these scan fre-

0

Cp

TI

A

MULT

L

ER

REDCAMERA

.1

GREENCAMERA

MATRIX

Y. 0.30R + 0.59G + 0.1I B/ (LUMINANCE)

BLUECAMERA

R -YMATRIX

ADDER

R -Y R -YMOD

B -YMATRIX

CHROMASYNC.

TRANS-MITTER

B -Y B -YMOD

V

1

3.58 MCOSC

90FHASESHIFTER

Fig. 4-Only two colors are transmitted with the luminance (white) information. The third coloris reconstructed in the receiver by subtracting the two transmitted colors from white. Each ofthe transmitted colors modulates the subcarrier which is fed 90 out of phase to the modulators

quencies were within the normallimits for B/W reception and acolor transmission system becamepractical.

Color Modulation and Sync

The extreme accuracies necessaryin multiplexing a color signal maybe appreciated by looking at toler-ance limits for the color subcarrierfrequency: 3.579545 mc ± 0.0003percent with a frequency deviationnot to exceed 0.1 cps/ps. The sub -carrier frequency is the 455th har-monic of one half the line frequen-cy.

A block diagram of the broad-cast equipment is shown in Fig. 4.The 3.58 mc signal is developedby a crystal controlled oscillator. Apart of this signal is used to syn-chronize the vertical and horizontaloscillators in order to keep the videoproperly interleaved with the colorinformation. Another part of thesubcarrier oscillator signal is fed tothe modulators; one through aphase shifter so that the modulat-ors will be 90° out of phase. Inthis manner the two color signalswhich are to be modulated can berecovered at the receiver, since thesidebands are transmitted withoutthe carrier.

TUNER

SOUND TARE -Orr

I VIDEO

DE T

PAWAMP

IMACIPINOL

TUN

7

LUMINANCE

ORM,

SPACE

S.140111C

COLOR SYNC SECTION1

COLOR

MLLE*

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II -TKNEAD

L. s -v0111100

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OUTPUT 1-4

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R -Y

SPLITTER 111Allttt

FILM 11PLITTLr:_. ;C / CRT \IOCOA

CNROMINANCE SECTION

NONZ

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Fig. 5-Block diagramof the color receiver.Sections not found inB W set are shownin shaded blocks.Note phase shift usedfrom the local oscil-lator frequency to de-modulate the chromeinformation


The signals to be fed to the mod-ulators contain the color informa-tion obtained from all three coloramplifiers; the signals are matrixedso the output is a "Y" (white) sig-nal (the luminance channel in col-or - standard signal in mono-chrome sets - ), R -Y and B -Ysignals. The last two are obtainedby subtracting the "Y" from thered and blue signals. Although somesystems use R -Y and G -Y signals,the principles involved are thesame.

The "Y" signal is transmitted inthe conventional monochrome man-ner. The R -Y and B -Y signals aremodulated 90° out of phase andadded to the normal signal. Re-member, this additive signal willhave no effect on B/W receivers,since it is interleaved in the normalsignal. Green information is recon-structed at the color receiver by sub-tracting R and B from Y.

The Color Receiver

At first glance much of the colorreceiver appears to be the same asa B/W receiver. The tuner, i-f andsweep sections are very similar. Thetuner has a low drift oscillator; slightdrifting in the oscillator has amarked effect on color reception.The i-f is basically the same exceptthat it is somewhat flatter in re-sponse and has a wider bandpass.A delay line and additional ampli-fication is included in the videoluminance circuits.

High voltage is generated in theconventional manner with a regu-lated output fed to the CRT anode.

A shunt regulator is used for theapproximately 3 kv needed to fo-cus the color CRT. Sweep failures,loss of video, sound problems,noise, and other B/W problems willall been encountered in color servic-ing. These problems are treated asthey would be in a B/W set. A fewadjustments or corrections mayaffect the color operation of the setbut these can be readily understoodand should create no unusual dif-ficulties.

Three sections have been addedto the color receiver which are notfound in a B/W set: The chromi-nance, color sync and convergencecircuitry.

Chromonance & Color Sync

A block diagram of a typicalcolor set is shown in Fig. 5. Theobject of these sections is to takethe transmitted information, de-modulate and matrix it to obtain

FRONTPORCH N

HORIZ/SYNC

9 CYCLES BURST

1111111L ---BACK PORCHHORIZBLANKING --INTERVAL

red, blue and green outputs for thepicture tube. Of course these willbe in the same proportions aspicked up by the camera tubes. Ef-fectively, this is accomplished byreversing the process used to trans-mit the signal.

In order to sync the color sig-nals and demodulate them, an ac-curate 3.58 mc source is neededsince the carrier was suppressed be-fore transmission. This is accom-plished by using a local crystal os-cillator in the receiver. To main-tain the exact phase and frequencyrelationship with the telecaster'ssubcarrier, a short frequency burstis used to sync the oscillator. Ninecycles (± 1 cps) are transmitted onthe back porch of every horizontalsync pulse. The horizontal blankingand sync pulse is shown in Fig. 6.This burst signal may be used tosync the local oscillator directly orfor afc type control of the circuit

Fig. 7-Typical oscillator and control circuitryused in color receivers to reconstruct sub.carrier. The local oscillator frequency is com-pared with the burst signal with a phasedetector. The phase detector output thencontrols a reactance tube which readjustsfrequency diviation.

Fig 6-Horizontal sync pulse transmitted witha color telecast contains a short 3.58 mcfrequency burst to synchronize the local os.cillator in the receiver.

AUGUST 196225

through use of a reactance tube.The oscillator and its control cir-cuitry is shown in Fig. 7.

You will recall that one of theR -Y and B -Y signals was modu-lated with the basic oscillator fre-quency and the other with the samefrequency 90° out of phase withthe first. In order to demodulatethe color information, the phase de-tectors must also be fed two sig-nals which are 90* out of phase.

Several types of detectors may beused to demodulate the signalsthough the multigrid detector is themost common. R -Y and B -Y arerecovered and the matrix regener-,aces the R, B and G signals.

Information from the "Y" chan-nel is fed to the matrix where de-modulated R -Y and B -Y informa-tion are added. The resultant is R,B, and G information. Each ofthese signals is applied to its re-spective color tube gun. Some sys-tems apply information from the de-modulators directly to the CRTguns. The cathodes are all fed "Y"information and matrixing is ac-complished in the picture

When B/W signals are receivedon a color set, a color killer cir-cuit is actuated to prevent spurioussignals in the color circuits fromcoloring the picture. This circuit isshown in Fig. 8.

The killer is normally adjustedwith no signal on a "dead" chan-nel until the colored noise in thepicture disappears. The settingshould be double checked, how-ever, to assure that the setting is

not killing color signals by tuningin a color program.

Convergence Circuits

If you have ever attempted toconverge a color set, you knowthere are two types of convergence:Static (d -c) and dynamic. Severalconvergence methods have beenused in sets made in the past, butmost color sets now being manu-factured use basically the same cir-cuits.

The need for convergence canbe understood by recognizing thatit is necessary for each gun beamto land on its associated color dotat all points of the CRT screen.This is accomplished with the twoaforementioned sets of adjustments.Static adjustments are most oftenmade with permanent magnets lo-cated on the neck of the CRT.These are somewhat similar to iontrap magnets. Consult the manu-facturer's manual - these could beconfused with the purity magnetsalso located on the CRT neck.These magnets should be moveduntil the three beams coincide atthe CRT center.

Coils also located on the CRTneck are fed voltages from the ver-tical and horizontal output to de-flect the beam properly for eacharea of the tube being swept. Eachconvergence coil is situated so ithas maximum effect on its associat-ed CRT gun. A wave shape of atypical voltage which is applied tothe convergence coils is shown inFig. 9. The amplitude and tilt of

BURST

AMP

REACTANCECONTROL

BK LLER FLYBACKTHRESHOLD RoLSE

356 MC OSC

TO COLORAMP GRIDS

Fig. 8-Killer circuitry cuts off color amplifiers when a color

signal is not being received. When no signal is present, thetriode is biased into cut-off. Du.ing saturation, the triode recti-fies the flyback pulse which biases off the color amplifiers

these signals are controlled by re-sistances and reactances so thatconvergence can be achieved for al-most any set of conditions.

Problems You'll EncounterOne thing you'll learn quickly in

servicing color receivers is notto adjust anything unnecessarily.Height, linearity, and width con-trols all have an effect on conver-gence and purity of the picture.Knowing what a good picture lookslike is half the battle: if the picturelooks good, don't try to make itbetter. The improvement in picturequality will probably not merit thenecessary time. Of course, if thepicture is obviously misadjusted,you're obligated to spend additionaltime and get a top quality picturefor the owner.

Converging a color set has beenconsidered a trying task. No oneknows how this rumor got startedor covered so much ground - butthose who have overcome this psy-chological hurdle have found littlemore than a comparatively lengthyjob. Just follow the manufacturer'sdirections. Less equipment is re-quired than used to align an i-fstrip and you'll find it much easierafter a couple of trials.

Purity adjustments are also easy.Don't rush - demagnetize theCRT and associated componentsfirst. You may find that this willclear up convergence and purityproblems without further adjust-ment. Dynamic convergence rarelyneeds readjustment.

tAkittotkholkFig. 9-Voltage on the convergence coils vary slightly to maintain conver-gence over the entire screen area. Voltage applied to these coils is usuallyobtained from sweep output tube cathodes.


No slide rule or logarithm tables are required when

this method is used to determine amplifier power gain

KNOW YOUR

Rapid decibel computations without the aid of aslide rule or log tables is possible with an approximateaccuracy within ±0.5db. This method is based on thepowers of 10. When it is realized that db expressesnothing more than a ratio, it becomes quickly obvioushow the system is possible in expressing power gainin db.

How It Works

Let's assume a certain amplifier has a power gain of10 to 1 (10:1). This ratio would be expressed as 10 dbSuppose a second amplifier has a power gain of 100:1.This would be expressed as 20 db. And a third amplifierwith a power gain of 1000:1 would have its gain speci-fied as 30 db. In other words, the db value correspondsto 10 times the exponent of 10.

For the 100:1 gain amplifier, as an example,100 to 1 = 102 to 1 = 2 x 10 = 20 db.

If a technician has difficulty with the powers of 10,

AUGUST 1962

6 7tedezet-k E. 70,ceikeirRadio Corp. of America

all he has to do is subtract the number of zeros from thelarge ratio number, write it down, and multiply the re-mainder by 10. A 10 db increment scale, derived fromthe powers of 10, and extending from 0 to 80 db, isshown in Table I.

A method must now be found to express the smallerdb values in one db increments. To do this, only threenumbers need be remembered. These numbers are: 1.25,1.6, and 2.0. These numbers correspond to 1, 2, and3 db, respectively.

Suppose you want to find the power ratio corre-sponding to 4 db. All you have to do is set these threenumbers in a simple table form, count backward threeplaces, and double the third number value.

For example, with three basic numbers, 1.25, 1.6,and 2, let's find the power that corresponds to 4 db:

1.25 to 1 = 1 db (3)1.6 to 1 = 2 db (2)2 to 1 = 3 db (1)Thus 1.25 x 2 = 2.5 to 1 or 4 db

27

Again, find the poner ratio that corresponds to 5 db.1.25 to 1 1 (11)

1.6 to 1 2 db (3)2 to 1 = 3 db (2)2.5 to 1 = 4 db (1)And 1.6 x 2 = 3.2 to 1 or 5 db.

Table II illustrates a second group of db values from1:10 db in 1 db increments.

With the two easily constructed tables, solution ofdb problems becomes a simple operation. Two thingsmust be remembered: powers of ten and the three basicnumbers, 1.25, 1.6, and 2. Let's apply this system to apractical problem.

Suppose we have an amplifier with a 1 w input,and a 400 w output. The problem is to determine theamplifier's gain in db. Upon inspection, it is apparentthat the db value will be larger than 20 db (100:1ratio) and smaller than 30 db (1000:1 ratio). Theratio of input to output is, of course, 400:1.

Rate the amplifier in db.1. Power ratio: 400:1 = 4 x 100:12. 100:1 = 20 db (Table I)3. 4:1 = 6 db (Table II)Therefore: 400:1 = 20 + 6 or 26 db.

Conversely, the power ratio of an amplifier ratedat 26 db can be found by reversing the procedure:

What is the power ratio of an amplifier having a26 db gain?

1. 20 db = 100:1 ratio2. 6 db = 4:1 ratio3. 20 db ± 6 dh 26 dh4. 100:1 x 4:1 400:1 ratio

Again, what is the power ratio of an amplifierhaving a 35 db gain?

1. 30 db = 1000:1 ratio2. 5 db = 3.2:1 ratio3. 30 db 5 db = 35 db4. 1000:1 x 3.2:1 = 3200:1 ratio

To make it still simpler, just find the ratio thatcorresponds to the small increment and add the numberof zeros as indicated by the first integer of the db value.

An easy method for finding the ratio equalling 26db is to look at Table II and go down the db column to6 db. Then place a 2 in front of the 6, giving you 26.Next go over to the corresponding figure in the ratiocolumn and add two zeros (effectively moving decimalpoint two places) to the number in that column, givingyou 400. This system also works in the oppositedirection.

If given the ratio of 400:1, you would go down theratio column until you reach 4. It is necessary to addtwo zeros, or move the decimal two places to the right,

KNOW Y(i[l;

to get 400 -then place a 2 in front of the 6 in the dbcolumn to come up with 26 db.

Although it is apparent that this system cannotcompete with a slide rule, it has sufficient accuracy forfield use. The accuracy is approximately plus or minus1/2 db. For values that lie between the table values forpower ratios, simply round off to the nearest value.

For Greater Accuracy

For applications that require greater accuracy, thissystem can be expanded very easily to include thetenth db values. To do this start with the first of thebasic numbers, 1.25. To derive a table for 0.1 db in-crements, remember three numbers; 2, 3, 3. Once againset 1.25 at the top of the list, and subtract from eachsucceeding value the amount in hundreds, as indicatedby the sequence.

1. 1.25 to 1 = 1 db2. 0.9 db = 1.25 - .02 = 1.23:1 ratio3. 0.8 db = 1.23 - .03 = 1.20:1 ratio4. 0.7 db = 1.20 - .03 = 1.17:1 ratio5. 0.6 db = 1.17 - .02 = 1.15:1 ratio6. 0.5 db = 1.15 - .03 = 1.12:1 ratioNotice the sequence of 2, 3, 3.

RATIO

to 1

DECIBELS

0

10 to 1 10

100 to 1 201000 to 1 3010,000 to 1 40100,000 to 1 501,000,000 to 1 6010,000,000 to 1 70100,000,000 to 1 80


Using the system of 2,3,3, a table of 0.1 db incrementscan be constructed (see Table III).

It is a simple matter to use Table III, in conjunctionwith Tables I and II. The computations are exactly thesame with an additional step added.

Find the power ratio that corresponds to 28.4 db.20 db = 100:1 ratio8 db = 6.4:1 ratio0.4 db = 1.09:1 ratio20 + 8 + 0.4 db =. 28.4 db.100 x 6.4 x 1.09 = 697.6:1 ratio

Now rate the amplifier gain in db. Assume 1 w in-put and 697.6 w output.

1. Ratio is 697.6:1 6.976 x 1002. 100:1 = 20 db3. The smallest number

from Table II, is 6.44. 6.4:1 = 8 db5. To find out how much greater 6.976 is than 6.4

divide 6.976 by 6.4 for a result of 1.096. 1.09 to 1 = .4 db (from Table III)7. 20 db + 8 db ± 0.4 db = 28.4 db 697.6:1

ratio

value nearest to 6.976,

Rate the db gain of an amplifier having a 1 w inputand a 6000 w output:

1. Ratio is 6000 to 1 = 6 x 10002. 1000:1 = 30 db3. Nearest ratio to 6 is 5 (from Table II)4. 5:1 - 7 db5. 6 divided by 5 = 1.206. 1.20:1 = .8 db (from Table III)7. 30 db ± 7 db ± 0.8 db = 37.8 db = 6000:1

ratio

For power ratios that do not coincide with thosein Table III, round off to the nearest value.

The system discussed can also be applied to voltage

RATIO DECIBELS

1.25 to 1 1

1.6 to 1 22 to 32.5 to 1 43.2 to 54 to 65 to 76.4 to 8

8 to 1

10 to 10

or current ratios where input and output impedances areequal. To use the charts discussed for voltage orcurrent db work, simply remember that a voltage dbwill express the same ratio as 1/2 that value when it isa power db. For example,

60 db (voltage) = 1/2 of 60 = 30 db power60 db (voltage) = 1000:130 db (power) = 1000:1

Once the conversion has been made, the computa-tions for voltage or current db are the same as thecomputations discussed for the power db.

Express the ratio as a db value with a 1 v inputand a 40 v output.

1. Ratio is 40:1 = 4 x 10:12. 10:1 = 10 db3. 4:1 = 6 db4. 40:1 = 16 db (power) x 2 = 32 db (voltage)

And again: What is the voltage ratio that cor-responds to 36 db.

1. 36 divided by 2 = 18 db2. 10 db 10:1 ratio3. 8 db = 6.4:1 ratio4. 10 + 8 db = 18 db5. 18 db = (power) 10 x 6.4:1 = 36 db (voltage)

The secret of the system is memorizing three num-bers: 1.25, 1.6, and 2. Memorizing those three num-bers, applying the powers of ten, and if greater ac-curacy is desired, remembering the 2, 3, 3, sequence,db computations become a very simple thing. As withany system, proficiency can only be gained throughpractice. With practice, these computations can bemade mentally. Although the system does not offerprecision obtained from a slide rule, or log tables, ithas the advantage of being completely independent ofthese devices.

RATIO DECIBELS

1.25 to 1 1.01.23 to 1 0.91.20 to 1 0.81.17 to 1 0.71.15 to 1 0.61.12 to 1 0.51.09 to 1 0.41.07 to 1 0.31.04 to 1 0.21.01 to 1 0.1

AUGUST 196229

Read Voltages to find those transistor circuit troubles

TRANSISTORSthe Easy Way

weal. e

Ever since the first election wasforced to move through a conductor,voltage measurements have beengiving more revealing testimony ina court of radio felonies than anyother witness. This is true in tubecircuits and is even more importantin transistor circuitry.

However easy it may be to readvoltages and compare them to thoselisted on a schematic, this "evi-dence" will mean very little to tech-nicians unless circuit operation is

thoroughly understood.A simple triode tube circuit is

shown in Fig. IA. Input and outputloads are designated R. and RL, res-pectively; they would represent re-sistors in a resistance coupled am-plifier, or transformers in an r -f ori-f stage.

PLATE

GRID

(PLATE,CURRENT)

CATHODE R,.

+ 6V

IC -"A

COLLECTOR (COLLECTORCURRENT)

BASE

B

EMITTER

6V

Fig. 1 (A)-Simple triode stage shows proper battery polarity andcurrent flow. (B)-An NPN transistor stage with an adjustable biasnetwork. Note that the battery polarity in respect to emitter andcathode is the same in tube and NPN stages.

Comparing Tube -Transistor

As every technician knows, the"filament" heats the "cathode,"which emits electrons. These elec-trons pass through the "grid" ontheir journey to the "plate," andthen follow a path through the load,RL, the battery and return to the"cathode." It takes energy for theseelectrons to get through the load,RI., and this results in a "voltagedrop" across RI-the greater theresistance, the larger this voltagedrop. The voltage drop is also pro-portional to the amount of current,Ip, flowing in the circuit, and isoften used to calculate the amountof current. For example, a platevoltage far below normal indicatesa large voltage drop at R. and high

3

IK

+.6 V

5.5 V

R4

(K

Fig. 2-Voltage measured across the emitter or collector resistorindicates the current flow through the transistor (I,). No voltagewould indicate no conduction


plate current; a plate voltage abovenormal means less drop in RL, andless current flow. These conclusionsare based on a normal battery volt-age and normal RL resistance, ofcourse.

The same principles apply to theequivalent transistor circuit shownin Fig. 1B. The collector can becompared closely to the plate of thetube; the base of the grid; and theemitter to the cathode. The trans-istor, however, has no filament. Itrelies on a small voltage from volt-ages divider R1 -R2, applied to thebase element, to start electrons flow-ing through the transistor. The 0.2 vdifferential between base and emit-ter is called "forward bias" and willbe mentioned again later. Electronsare drawn from the emitter by thisbias and sent into the collector cir-cuit. They follow the same path asthose of the tube circuit through theload, RL, the battery and into theemitter circuit.

Estimating Collector Current

A typical i-f amplifier stage isshown in Fig. 2. Note that it is simi-lar to the circuit in Fig. 1B, exceptthat transformers are shown in thebase and collector circuits. Also, thevariable resistor R1 -R2 is replacedby two fixed resistors R1 and R2.This sets the base voltage to theproper value. Resistors are also in-serted in series with the emitter andcollector circuits. R3 between emit-ter and ground and R4 between theoutput i-f transformer and 6 v. Col-

lector current lc, flows through bothof these resistors, producing a volt-age across them, which is propor-tional to the amount of currentflowing.

Collector current can be estimat-ed by measuring the voltage acrossR3 or R4. If the current stops flow-ing for some reason, the voltageacross R3 would decrease to a verysmall value and the voltage acrossR4 would disappear, sending col-lector potential to 6 v. One of thesetwo resistors may not be present insome crcuits, but both are seldomeliminated. Their presence helps totell whether the transistor is con-ducting without opening any leadsto measure current.

If you are interested in estimatingthe value of current through R3 andR4 fairly closely, simply measurethe voltage across one of them anddivide by the resistor value. For ex-ample, if the voltage in Fig. 2 is0.5 v; divide by the resistance valueof 10000 and the answer is 0.0005amp or 0.5 ma.

A Typical PNP Circuit

A basic PNP transistor circuit isshown in Fig. 3 which resembles theNPN circuit except that the batterypolarity is reversed. This reversal isnecessary because the internal pol-arity of the transistor material isopposite from the NPN transistor.The emitter is now the most positiveelement, the base is next, and thecollector is nearest ground. Thesame principles apply except that in

Fig. 3-When a PNP transistor is placed in a circuit similar to Fig. 2,the battery polarity must be reversed. The electrons in this circuittravel from the collector to the emitter.

the PNP circuit the electrons flow inthe opposite direction around thecircuit (see arrows). There is stillabout 0.2 v difference between baseand emitter for "forward bias" butthe emitter is now the most positiveelement in the transistor.

It is possible that either R3 or R4may not be present in this circuit,but both are rarely omitted. In thecase where R3 is not present, thevoltage at the collector is used tofigure collector current. If R4 is notpresent, the voltage at the emittermay be used to estimate collectorcurrent. In audio circuits, the trans-former resistance in the collectorcircuit and the voltage across it maybe used to figure collector current,since the current and transformerresistance are sufficient in mostcases to produce a readable voltageat the collector.

A typical power transistor outputstage is shown in Fig. 4. Resistancesare much lower in this type of circuitbecause the internal resistance ofthe transistor is much lower than thetype discussed previously. Collectorcurrent is checked by measuring col-lector voltage, which is actuallymeasuring voltage across the outputtransformer, RL. With a transform-er resistance of 1 ft, including speak-er, and a collector current of 1.0amp. the potential would read 1.0 v(E=I, x R). By adjusting bias con-trol R2, the correct collector voltageis set when a new transistor is install-ed. The speaker must be connected,and the proper input voltage sup-

BIASCONTROL

Ri

108 V

'NPI.0 V

I AMP

II V

.47FUSERESISTOR

+12V+12V

RL

In

10V

Fig. 4-In an auto radio output stage, the collector voltage indicatescurrent flow. No voltage :t the collector would indicate no con-duction and a probable open fuse resistor and shorted transistor.

AUGUST 196231

plied to the radio when this is done.Some circuits use a grounded collec-tor where the transformer is foundin the emitter circuit. The presenceof voltage across the transformer isusually a tip off that the stage isconducting and working normally.

Relationship of Element Voltages

The relationship of voltages be-tween transistor elements assumesequal importance with collector cur-rent. In an NPN circuit, the emitteris the least positive, or most negativevoltage; the base is slightly morepositive; and the collector is nearestto the positive battery potential. Inthe PNP circuit, however, the oppo-site is true: The emitter is mostpositive, or least negative; the baseis slightly less positive; and the col-lector is farthest away from theemitter voltage.

This rule is illustrated in Fig. 5.In NPN circuits the emitter is usedas a reference. With the negativemeter lead placed on it, the baseis slightly positive and the collectorconsiderably more positive with re-spect to the emitter. In the PNP

circuit, the emitter is again used asa reference, but with the positivevoltmeter lead placed on it. Thebase is slightly negative and the col-lector considerably more negativewith respect to the emitter reference.

An exception to this rule is some-times seen in converter or mixer cir-cuits, where the emitter -to -base re-lationship may be reversed fromnormal because of oscillator signalvoltage in the stage. A zero or re-versed emitter -to -base voltage inother stages usually means thatthere is an open in the emitter cir-cuit, or a leaky transistor which isdrawing excessive collector current.A zero emitter -to -collector voltagecan be caused by an opening in thecollector circuit, or a shorted powertransistor if it is a power outputstage.

Voltages are usually measuredwith respect to ground and com-pared to those indicated on theschematic. Then, if a noticeable er-ror exists in a stage, the voltage re-lationships in the stage are checkedelement to element, using the emit-ter as a reference. (See Fig. 5). The

NPN

SMALLVOLTAGE

+++

LARGERVOLTAGE SMALL

VOLTAGE

PNP

LARGERVOLTAGE

Fig. 5-Relationship of voltages in typical transistor circuits using the emitter as a reference.Converter circuits often have B and E voltages reversed from this condition when the osciletoris functioning

collector current can also be quicklyestimated as previously described.In most cases there is nothing toworry about in a stage if voltagerelationships are normal and thetransistor is drawing collector cur-rent. About the only exceptionwould be faulty alignment of a tun-ed circuit, or an open capacitor inthe i-f transformer or other point.

AGC Voltage and its MeaningAutomatic gain control (agc) is

accomplished by feeding back somerectified and filtered i-f voltage tothe "front end" of the receiver, (SeeFig. 6). The voltage is actually a de-generative voltage, reducing thegain of the receiver on strong sta-tions to prevent overloading and dis-tortion. It is usually obtained fromthe audio detector diode and volumecontrol system, but may have aseparate diode of its own to rectifythe i-f output. It is then filtered andapplied to the 1st i-f or r -f stage-usually to the base element, but oc-casionally to the emitter instead.This changes the bias and collectorcurrent in that stage.

Very little trouble is found inmost agc systems. A general rule isthat if the voltage on the agc linevaries when the radio is tunedthrough a strong station all is wellwith the system. If no change takesplace, the agc diode or some com-ponent along the agc line may bedefective, but it should always beremembered that a defect anywherein the "front end" or i-f strip willalso result in poor agc action.

Complete lack of agc usuallycauses distortion only on very strong

Continued on page 65

TN/

I-)I RF I

JCONV IF IF DET

AGC LINE

---> AUDIO

Fig 6-Block diagram of a radio showing agc connections Dotted lines represent the sectiors which may be found in some radios


Your Stake

In Color TV

No one anticipates a public buy-ing spree in color TV receivers ap-proximating that enjoyed by black -and -white sets in the early '50s.But barring an unforseen generaleconomic reversal, objective condi-tions exist today for a steady growthin color TV receiver sales.

W. Walter Watts, a Radio Cor-poration of America vice president,said recently before a symposiumof EIA, "I sincerely believe thatone million color sets could be soldin 1963.

"Speaking for RCA, we intendto give the customer the best pos-sible value for his money while pro-viding fair profit margins at alllevels of distribution . . .

"While we expect to see a strong,healthy, black -and -white marketcontinue in the years ahead, thismarket would be mainly in the areaof lower -priced, lower margin sets."

As most TV -radio service -deal-ers already know, RCA has spentmany millions to develop and pro-mote color TV.

Some Other Company Positions

A few months ago the nationalservice director of Zenith, Frank

More alert TV technicians are pre-

paring to take advantage of higher

profit margins on rising colorTV sales and service volume

Smolek, made it clear that his com-pany has both feet solidly plantedin a color 1'V manufacturing andpromotion program. More than 10,-000 independent TV -radio servicedealers have already completedservice training seminars throughcompany distributors. Additionalnumbers were reported attendingthe seminars which are being con-tinued to take care of the demand.The company is already manufac-turing two color chassis, one withmanual control and one which in-cludes the "400" Space Commandremote control system.

Sylvania has introduced threenew 21 -in. color TV sets. RobertJ. Theis, president of SylvaniaHome Electronics Corp., marketing

subsidiary of Sylvania, said the ex-panded Sylvania color TV line in-cludes two low -boy consoles andone vertical console. Suggested re-tail prices range from $695 to$775.

The position of Motorola, asstated a few months ago by Ed-ward R. Taylor, executive vice p:es-ident, is that Motorola does notplan to introduce a color receiverat this time. Motorola is develop-ing its own rectangular 23 in. pic-ture tube which it hopes to haveready for the market within a year.His company believes this tube willopen the door to greater color setsales through creation of a morecompact package and ultimatelylead to lower color TV set prices.

AUGUST 196233

Installation, alignment and maintenance of audio

modulated VLF and CB remote control equipment

Installation and maintenance ofgarage door openers is a "natural"for wide-awake TV -radio techni-cians looking for additional sourcesof income. Most technicians are al-ready familiar with TV remote con-trols which are similar to those usedfor electronically controlled dooropeners. The electro-mechanical"operators" used with these devicesare relatively easy to handle.

The repair of garage door open-ers is usually left to the equipmentdistributor. The retailer is generallynot prepared to service them, andtime is wasted when they are re-turned to the factory. Repairs arealso unnecessarily expensive whenboth the transmitter and receiverare sent to the factory. "Pre -paired," matched frequency unitsmake substitution out of the ques-tion for the do-it-yourselfer.

Remote controlled door openersare no longer a "rich boy's toy."They are not only practical but arebeing installed more widely in one -car garages.

Control Types

Several control types are now be-ing marketed. Most manufacturershave settled on r -f signal transmit-ters located in the car. Additionalcontrolling points near the door orinside the house are usually wireddirectly to the operator control re-lay. Types now being produced in -

4 7. ;4, R -ego,

dude transistorized transmitters andreceivers. The transmitters may besmall hand held types, like thoseused in TV remote controls, orlarger under -the -hood types operat-ed from the car battery. Thesemodels are push button controlledfrom the car's instrument panel.

Most technicians are acquaintedwith remote devices which are ac-tivated by light and sound. Theseunits, operating from the car's hornor lights, inadvertently may be"touched off' by passing traffic.Light operated controls are fre-quently difficult to adjust with suf-ficient range to prevent accidentaloperation by sunlight. Both soundand light operated types, however,may be coded for optimum reliabil-ity. Three blinks of the headlightsor three horn toots, can be em-ployed, for example.

At least one manufacturer mar-kets a control which operates onvery low frequency (VLF). Theunit is transistor powered and avail-able preset to one of 25 differentfrequencies from about 7000 to10,000 cps.

If you plan to sell door openersall of these types should be con-sidered. Each has its advantagesand disadvantages. Some have shortcontrol distances, others require li-censes for operation. Most licenserequirements are for Citizens' Bandfrequencies, however, and require

only that the user make applica-tion for a permit. The technicianmust have at least a 2nd class li-cense, however, to fully service CBtransmitters.

Mechanical Considerations

The type of unit or the manu-facturer may be determined by theconstruction of the door or garagewhere the control will be installed.Overhead clearance is the most im-portant item. Units presently on themarket require anywhere from 11/2in. to several inches of clearancebetween the door and the neareststructure above the door as it isopened.

The balance of the door shouldbe as good as possible to preventunnecessary wear to the "operator."Most operators are able to lift heavydoors without any problem. Chang-ing seasons can also present a prob-lem, especially on spring loadedtype doors. During the cold season,pressure applied to the systemthrough spring contraction cancause erratic operation because ofpressure applied to the limit switch-es.

Specific installation problems areusually well covered in instructionssupplied with the system.

Typical Systems

Although the system may containtransistors or tubes and may be op -


A complete remotecontrol system madeby Tamar ElectronicsInc., showing twohand-held transmit-ters. The transmittershave clips for at-taching to the sunvisor when not inuse.

An Allister operator with cover removed to show thechain drive, limit switch, relays and garage lightsocket. The .amp lights when the door is opened.

AOServicing

Remote Controlled

Garage DoorOpeners

Installation of a "Genie" operator unit in a garage. This oarticular model lifts the door by screwaction and is made by Alliance.

Perma Power's small hand-held transmittercan be used on any car with no modificationsor installation problems.

Multi -Products Companys' transmitter may b.mounted under the car's dash or hood.

AUGUST 1964 35

C r y s t a I controlledtransmitter uses onlytwo transistors forcarrier and modula-tion.

KTAL

=- 22.5 V

Mounting the Moore-O-maticoperator is made with two boltsthrough an angle iron securedto the ceiling

MODI

MOD I- F -DE T -

rTOOPERATOR

erated from a hand-held transmit-ter or built into the car and op-erated from its electrical system,the principle of operation is ba-sically the same.

In order to avoid "phantom op-eration" many of the systems usea modulated carrier. A modulationdetector in the receiver then rejectsany signal without the proper mod-ulating frequency. Also, in thismanner only a few modulating fre-quencies plus a few carrier frequen-cies result in a large number ofusable non-interferring signals. Thismodulation is impressed on the sig-nals in several different ways.

One method uses a relay weight-ed and balanced so it closes at aspecific frequency. The relay shunts

X MTR

Basic block diagram of a garage door control system. Optional modulatorand modulation detector are shown in dotted lines. When modulation of Fig 1-Output from most transmitters can be checked with athe proper frequency is not detected, the rectified input is cut off at the standard VOM set to a low microampere scale and connectedamplifier. in series with several turns of wire and a crystal diode.


a large capacitor across the r -f out-put thus modulating the output sig-nal. The modulating frequenciesused in these relays is from 15 to 25cps.

The receiver uses the same typerelay for the demodulator. The re-lay coil is tied in series with anamplifier tube cathode. If the in-coming r -f is properly modulated,the relay operates and energizes thedoor opening relay. This relay isoften hooked to a larger power re-lay which operates the motor.

Though transistors have beenused in a large number oftransmitters, the tube is still popu-lar in receivers. Probably becausesize and portability are not neces-sary in a receiver and the economy

41 VAC

vi493

ISO

C1 ca

The Multi-Elmac receiver is typical of most tube type Garage units. The power consumption isless than 20 w.

Chain drive is used most fre-quently for door operators.Hunt & Martin ManufacturingCompany's lift ar-n is con-structed in two pieces withmultiple holes to adjust armlength.

001 I COO

VT

4914

as

se

ID

V3

GSA T11593C

.130

VSc..

9 23

4011

Mir

3500 C MJ IMOSI Mgt

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50/ 1500

130

C12

50050 V

2?03410 41.1.1111.10

rl4112.

.( u-14

v

-10

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.10 vOCT-AdV\r-7

:-,vr. co -TirT. 110v

1r'er

Tube type receiveroperates in the Citi-zens Band range. Themodulation detectorin this unit is a plugin tank circuit whichcan be changed forthe desired fre-quency.

AUGUST 1962 37

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005

.001

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VIBRATORPOWERSUPPLY

Tube type transmitter uses unusual modulation techniques. A balanced relay vibrates at a

specific frequency which shorts a large capacitor across the tank in the transmitter.

of changing products is less thandesirable.

Alignment

Depending on the equipment,alignment can be very simple or ascomplex as peaking a superhet ra-dio. For example, one manufactur-er's transmitter tuning recommenda-tions are shown in Fig. 1. Thetransmitter is crystal controlled andonly needs to be peaked for maxi-mum output.

A coil of seven or eight turns iswired in series with a good diodedetector and the lowest scale on a20,00011/v meter or a special 100 A. E. Moore Co.10 Holbeck St.Waupaca, Wis.

iza scale. When the coil is positionedon the same axis as the transmittingcoil the meter will give an indica-tion of relative output.

Receivers can of course, bealigned with a good r -f generator(up to the demodulator) where it isnecessary to use an accurate audiogenerator. In most cases the receiveris peaked for maximum signal atthe relay coil.

Peaking trimmers are located inthe antenna circuits of both thetransmitter and the receiver. Be-cause of variations in different in-stallations, the antenna will notnecessarily be tuned to maximum

Members of Door Operator & RemoteControls Manufacturing Association

Advance Industries, Inc.R. R. 3 Box 84Appleton, Wis.

Alliance Manufacturing Co., Inc.Exton, Penn.

Berry Door Corp.2400 East Lincoln Rd.Birmingham, Mich.

ClevelandDetroit Corp.5400 Brookpark Rd.Cleveland 29, Ohio

The Dalton Foundries, IncWarsaw, Ind.

Edwart T. Fink Co., Inc.284 Nepperhan Ave.Yonkers, N. Y.

Multi -Products Co.21470 Coolidge HighwayOak Park 37, Mich.

Murray Industries, Inc.4308 Carnegie Ave.Cleveland 3, Ohio

Overhead Door Corp.Hartford City, Ind.

Perma-Power Co.3100 N. Elston Ave.Chicago 18, III.

Vemco Products, Inc.10333 Shoemaker Ave.Detroit, Mich.

efficiency. A meter located at thc:

relay coil in the receiver will givethe best signal strength indicationwhile tuning the trimmers for maxi-mum with the transmitter on. Usecaution in operating most transmit-ters for more than a few seconds.They are designed to operate onlyfor a very short time with sufficienttime to cool off between operation.

If the trimmer adjustment seemsto be too wide in response, backthe transmitter away from the re-ceiver till it becomes sharp. Maxi-mum operating distance can also bedetermined in this way.

Manufacturer's instructions usu-ally give alignment data and fre-quently tell how to align the systemwith only the transmitter as a fre-quency source.

MaintenanceDetecting the transmitted signal

to find out which unit is in opera-tion is usually the first step in trou-bleshooting a remote system. Thiscan be accomplished with a detectedmeter circuit as shown in Fig. 1

If the transmitter has failed voltageand resistance checks should helpyou find the trouble rapidly. Onlya few components are used in mosttransmitters so all components canbe checks in a short time if neces-sary.

It is possible to get an indica-tion that the transmitter is operat-ing using this method, however,even if the modulator is inoperative.This is most easily detected at somepoint before the demodulator in thereceiver using a scope to view thewaveform. A very high gain scopeis needed for this check. Dependingon the modulating frequency, ear-phones may be substituted for themeter for a "go -no-go" check onthe modulator.

Since the transmitter should notbe operated for long periods oftime, a signal generator should beused to check the receiver. A metercan be connected to the relay coilon the output stage and signals canbe injected at each stage, movingfrom the last stage to the first. Whenthe meter fails to indicate the sig-nal, the dead or weak stage hasbeen found. Larger signals are need-ed near the output stage than at theinput stage, of course.


Four Camera Tubes Used In

NEW EXPERIMENTAL

COLOR TV CAMERA

C. H. Colledge and Dr. H.

N. Kozanowski (holding im-age orthicon) with theTK42x camera. The newcolor camera employs fourpickup tubes instead ofthree used in conventionalcolor cameras. The fourthtube superimposes a blackand white picture over thecolor for a high quality pic-ture.

A 41/2 -in. diameter camera tubeis the eye of an experimental RCAcamera, model TK 42X, which pro-duces color television pictures hav-ing richer hues and finer detail thanpreviously attained with studio cam-eras.

In the new camera, the imageorthicon picks up the black -and -white signal, while three one -inchdiameter vidicon's are used for thered, blue and green picture infor-mation.

The imposition of a clean preciseblack -and -white signal from the oneimage orthicon tube on to the threeprimary color signals, a techniquesimilar to that used in four-colorprinting, enriches picture hues andprovides sharper definition. Thiscomposite signal also provides su-

perior black -and -white pictures onB/W TV sets during color telecasts.

The color camera was construct-ed by the RCA Broadcast and Com-munications Products Div. as theforerunner of equipment for futureTV stations. It was demonstratedat the National Association ofBroadcasters convention in Chi-cago.

Present color cameras employthree camera tubes, one each forthe red, blue and green channelsthat are combined to form the colorinformation as well as the "mono-chrome" black -and -white picture in-formation. The experimental colorcamera utilizes the fourth pickuptube to provide a separate cleanand sharp monochrome picture sig-nal. The tube contributes to the

camera's improved picture resolu-tion, signal-to-noise ratio and grayscale rendition.

This same image orthicon is cur-rently employed in high -qualityblack -and -white TV cameras. Itsexcellent capability over varied lightconditions makes it well suited foroutdoor or studio pickup.

The three 1 -in. diameter vidiconshandle the color picture informationin the new camera. These cameratubes have electrostatic focus andelectrostatic deflection. Becausethese tubes are very small and re-quire no deflection coils, the newcamera which uses four cameratubes is smaller than present cam-eras using only three pickup tubes.Present day color sets will receivecolor with no modifications.

AUGUST 196239

.1( TOUGH DOG CORNER

Difficult Service Jobs Described by Readers

High VoltageBurns AGC Control

We had an RCA CTC11 Colorchassis come in for repair. Intermit-tently the agc control smoked assoon as the receiver warmed up.The chassis was removed from thecabinet and not only was the agccontrol, R-133 burned but resistorR-146 was damaged. An ohmmeterwas placed from the 6BK4'S heat-er to ground and there was noshort. The next time the a -c cordwas plugged in, it took about 10minutes before the control startedto smoke. The circuit again waschecked and no short could befound. The shunt regulator tube waschecked in a good tube tester, butshowed no short. On a hunch theshunt regulator tube was replacedand the chassis "fired up" again.No smoking, everything was fine,so the agc control and R-146 werereplaced. The chassis has beenworking okay since. The 6BK4 tubewas, no doubt, leaking between theheater and cathode when the tubewarmed up, placing excessive volt-age across the agc control and R -146.-H. L. Davidson, Ft. Dodge,Iowa.

Short Burns OutThree Tubes

Some months ago a call wasmade to a customer's home to re-pair a Crosley 431-1 TV. The pic-ture tube was defective and a newone was installed. After all adjust-ments were made the chassis wasinstalled in the cabinet. The setthen developed a hum, and the pic-ture and sound both disappeared.The first three tubes in the seriesstring had burned out. The 12L6had a cathode -to -heater short, so itwas assumed that this was the causeof the trouble, as no other shortcould be found. A cathode -to -heat-er short would bypass all the othertubes but the three mentionedwould have several times normalvoltage across the heaters. Threenew tubes were installed and theset was turned on. It worked fine.One month later the customer calledand said that the set had gone dead.A trip was made to the house andthe three tubes were again foundburned out. The 12L6 had a cath-ode short and so did the 12DQ6and the 12AX4!

A new investigation was begununder the assumption that an in-

R

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High voltage was impressed across the agccontrol when the shunt regulator in a colorset developed leakage.

termittent grid capacitor in the12L6 circuit was shorting, over-heating the tube and starting thetriple tube burnout. The capacitorwas replaced, and resistor values inthe grid circuit were checked andfound normal. The series filamentresistor value was checked andfound to be low, so a 1512, 15 wresistor was temporarily wired inthe circuit. The 12L6 potential wasnow 12.45 v.

After checking for a leak or shortfrom the 12L6 cathode and heatercircuits, none was even found whilejarring the chassis. A set of threetubes was installed and the set

turned on. It worked fine again andafter waiting around for half anhour, I left with a prayer on my lips.

About a month later, we had an -Continued on page 66

TOUGH DOGS WANTEDS10 00 paid for acceptable items. Use

drawings to illustrate whenever neces-sary. A rough sketch will do Photo-

graphs are desirable. Unacceptable

items will be returned if accompaniedby a stamped envelope. Send yourentries to "Tough Dog" Editor, ELEC-TRONIC TECHNICIAN, 1 East First St.,

Duluth 2, Minnesota.

A short in the tuner was caused by excessive solder on a feed -through capacitor


New steels are

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...when you sell TV masts or towers made of Armco ZINCGRIP Steel Tubing

Your customers' confidence in you will increaseand your profits are likely to go up too when TVmasts or towers you sell are made of Armco ZINC -GRIP® Tubing.

This rugged steel -strong tubing helps keep an-tennas aligned despite ice and wind, and its specialzinc coating resists rust for years. See for yourselfhow easy it is to sell customers on these advantages.See, too, how satisfied customers return to buyother radio and TV products.

It will pay you to get details. Just fill in and mailthe coupon for names of manufacturers of durable

masts and towers made of Armco ZINCGRIPSteel Tubing.i

Armco Division, Armco Steel Corporation1332 Curtis Street, Middletown. Ohio

Send me the names of manufacturers who make TV masts and towers ofArmco ZINCGRIP Steel Tubing.

Name

Firm

Street

City Zone State

ARMCO Armco Divisionvfor more details circle 12 on page 46

AUGUST 1962 41

TEST BINISTRUMENTSfor Bench and Caddy

Conar Oscilloscope Model 250at $139.50 Wired, $89.50, Kit -The model 250 is an adequate in-strument, with some of the featuresfound in much higher priced equip-ment.

The scope has a vertical frequen-cy response which can handle colorservice work, being only 1.5 db downat 3.58 mc. The horizontal sweepis extended to 500 kc so the burstfrequency is actually visible. An in-teresting modification is suggestedto allow the scope to accuratelycheck for faulty yokes, flybacks orlinearity coils. A pulse from thehorizontal circuitry is fed to the"Z" axis input jack and externallyconnected to the vertical input jack.A coil connected across the verti-cal input then is pulsed so that itsringing frequency is displayed onthe scope. Shorted turn faults areeasily found in this manner.

The scope has a 5 -in. screenwhich is powered by 2400 v. Suf-ficient amplification is used, how-ever, to give the scope a verticalsensitivity of 0.23 v/in. The traceremains clearly visible under goodbench lighting conditions at thehighest sweep frequencies. Directp -p readings of complex waveformsare obtained with calibrated con-trols.

A brushed aluminum panel withblack lettering is used for excellentlegibility of the scope panel. A goodinstruction manual is included withthe scope giving instructions on useof the scope for general and TVservice work. A set of four probesdesigned for the scope are alsoavailable in a convenient roll -uppouch at additional cost.

The oscilloscope is built by Co-nar Instruments Div. of the NationalRadio Institute.

OHM-MILLIAMMETER

RCA Volt -Ohm -Milliammeter,Model WV -38A, at $43.95 Wired,$29.95, Kit - The VOM is prob-ably one of the most -used instru-ments in the radio -TV shop. Thisinstrument should be rugged, easyto read, and accurate. The RCAWV -38A qualifies on all counts.The unit tested was well within the±3 percent tolerance specified bythe manufacturer for the d -c scalesand within the 5 percent specifiedfor the a -c scales.

Eight d -c ranges and seven a -cranges are incorporated in the me-ter with 20,000Q/v d -c and 50000/v a -c input resistance. There are

also six d -c current ranges whichhave a 0.25 v insertion loss. Thescale is calibrated in db (-20 to+10) which is invaluable to any-one working with audio. A singlefunction switch selects a -c or d -coperation as well as the polarity ford -c operation. This eliminateschanging both leads when measur-ing different voltages in a chassis.Both d -c and a -c meter functionsare calibrated for 5000 v.

A 51/4 -in. "extended view" meter,mounted in clear plastic case, allowsgood visibility and avoids lightingproblems. A vinyl case and HVprobe are also available.


EST SET

B & K Television Analyst, model1076 at $299.59. Evidence of ad-vancing sophistication in TV testequipment is obvious in the model1076. It is a complete TV set andtransmitter which can inject a video

signal into any point from the an-tenna terminals to the picture tube.The set also has built-in horizontaland vertical sections which can in-ject a sync signal or be used todrive the sweep tubes, transformersor yoke. The instrument is alsocapable of checking yokes and fly-back transformers after they areisolated.

Color signals can be generatedto trouble -shoot the chroma cir-cuitry. A rainbow pattern is gener-ated by phase shifting the test setssubcarrier 15,750 cps from the tele-vision sets burst frequency.

After using the Analyst a shorttime the technician should be ableto isolate a receiver's faulty stage

Simplified test circuits used in theHeath TT -1A tubetester

R-3

MKi.e

TO ELEMENTS UNDERTEST

I33K

in a few minutes. In many casesthe tester will even isolate the faultycomponent. A handy neon highvoltage indicator is supplied with thetest set to indicate the presence ofhigh voltage while substituting var-ious stages in the horizontal or highvoltage sections of the receiver.

A complete set of slides are sup-plied with the unit for a test pattern,line, rainbow, dot and no informa-tion. Other slides can be made for"broadcasting" to a TV set for ad-vertisement or instructional pur-poses. The 50 page instructionmanual supplied with the Analystis complete in every detail. It is acourse in itself on logical troubleanalysis in television receivers.

FPITUBE TEST

Heathkit Tube Tester, ModelTT -1A Kit at $149.95 -

Many shops are having troublekeeping up with the multitude ofnew tube types which are appear-ing on the market. Tube testersbuilt only two years ago are nowbeing revised or junked. New tubetesters must be able to accommo-date five and seven pin nuvistors,compactrons, 10 and 11 pin minia-

Continued on page 66

AUGUST 1962 43

SHOP HINTSTIPS FOR HOME AND BENCH SERVICE

Tube PullerTubes in hard -to -reach places,

between i-fs in car radios for ex-ample, can be pulled easily with the

Tube puller for hard -to -get -at tubes can befashioned from short strips of masking tape.

aid of a short piece of maskingtape. Simply stick the tape to eachside of the tube so that a loop isformed. Put your finger in the loopand gently wiggle the tube loose.-Clyde Pearce, Whiteville, N. C.

Rubber Holds RadiosWhen working on transistor ra-

dios, a piece of foam rubber about12 x 12 in. and IA in. thick canbe placed on the bench to preventslipping. The rubber will also pre-vent the radio from being scratchedif the work is being done with theradio in its case. - Wayne N. Pot-ter, East Canton, Ohio.

Tape TipsUsing tape in a tight spot is of-

ten a problem. The whole roll oftape is too big and a piece longenough to do the job usually picksup enough dirt so that it won'tstick. To simplify this job, simplyroll off sufficient tape to do thejob and roll it tack on itself. Thisminiature roll can then be handledin a tight spot.

A pyramiding tape roll can be

halted if the cardboard center usedin the roll is removed by cuttingit out. The moisture evidentlycauses the cardboard to swell, caus-ing the roll to pyramid outwardfrom the center. - Sid Elliot, WestPalm Beach, Fla.

Load -Check MeterAn ammeter which costs about

$3 can be a valuable test instru-ment for your bench work. I havea 5 amp unit in series with theline used for testing TV sets. Theline is fused for protection and themeter gives me a continuous indi-cation of the current the set is draw-ing. Most important, loads can beobserved through warm-up periodswhen a shorted rectifier or filtermight be detected too late to savethe transformer. Also, a simple cal-culation gives me the power con-sumption of the set which can becompared to the rated power. -Nicholas B. Cook, Paterson, N.

Transformer ReplacementWhen replacing power transform-

ers on some TV sets, the job canbe done easier if the following pro -

Transformer leads are easily routed throughthe chassis if new transformer leads are firstfastened to the old transformer leads.

cedure is observed: The transform-er should be unmounted and pulledout far enough to enable cutting theleads next to the transformer. Tem-porarily solder the full length new

transformer leads to the old wireswhich are attached inside the chas-sis. Now pull the wires through thehole in the chassis and fasten thenew transformer. The old wires cannow be disconnected at their ter-minals inside the chassis, and arevery helpful for putting the newleads through. This will automatic-ally route and properly dress 'thenew leads and assure connectingeach wire to the proper terminal.-Walter Savelly, Detroit, Mich.

Parts BoxWhen making TV repairs, a clear

plastic parts box will save time andwill keep parts together when wait -

Clear plastic box makes an excellent partsbox for old TV components.

ing for a customer "go-ahead" onreplacement parts. All parts in thebox are visible allowing quick iden-tification. Plastic shoe boxes areabout the right size and are tightenough to prevent parts loss if tip-ped over. - H. Leeper, Canton,Ohio.

SHOP HINTS WANTED!53 to 510 for acceptable items. Use

drawings to illustrate whenever nec-

cessary. A rough sketch will do.

Photos are desirable. Unacceptable

items will be returned if accompaniedby a stamped envelope. Send your

entries to Shop Hints Editor, ELEC-

TRONIC TECHNICIAN, 1 East First St.,

Duluth 2, Minnesota.


RCA Color-Bar/Dot/ RCA 5 -Inch Oscilloscope RCA Television FM RCA RF/VF!IF RCA Crystal -CalibratedCrosshatch Generator for Color -TV Sweep Generator Marker Adder Marker GeneratorLow-cost, lightweight. porta-blal

or

leto

A wideband scope excellent Specifically desienad fnr Sinn irs A fundamental fre-

FREE LITERATURE

To receive the literature below without charge, simply circle the number on the coupon

COMPONENTS 300

phis distributors general componentlistings cover 24 pages. Many hard -to -find items in potentiometers, powerrheostats, switches, sockets & plugs,capacitors and transmitting micas aredetailed. Derf Radio Co.

TOOLS 301

A 12 -page catalog lists displays ofscrew drivers and other shop tools de-signed for the electronics trade. VacoProducts Co.

ELECTRONIC PARTS 302A 94 -page electronic parts catalog in-

cludes eight sections and covers 55,000parts. The sections are capacitors; re-sistors and RC networks; antennas andantenna accessories; auto radio, anten-nas and accessories; fuses, switches.lamps and controls; rectifiers, diodes andtransistors. Consumer Products Div. ofPhilco Corp.

TUBE TESTERS 303

Catalog describes a line of shop anddo-it-yourself type tube testers and testadapters. Mercury Electronics Corp.

TWO-WAY RADIOS 304A brochure details a line of new 25

and 75 w high band and 35 and 100 w

low band mobile units. CommunicationsCompany, Inc.

I -F TRANSFORMERS 305Bulletin #609 gives specifications on

two new series of miniature top -tuned i-ftransformers. Twenty-four units are out-lined. Stancor Electronics, Inc.

ANTENNAS 306Electric powered antennas for CB,

a -m and a convertible model for both,are described in a series of data sheets.All three units are designed for 12 voperation and can be mounted on mostlate model cars. Tenna Mfg. Co., Inc.

INTERCOMS 307A variety of intercommunication sys-

tems designed for consumer, commer-cial and industrial applications is de-tailed in this catalog. Both tube andall transistor models are included. Fan -on Electronic Industries, Inc.

SALES AIDS 306A knob hanger for local advertising

and an estimate sheet are intended tohelp technicians do a better job of sell-ing antennas. The hanger stresses themanufacturers product and technicians'professional services. Channel MasterCorp.

rlIT HERE

EPDXY SOLDERS 309Application data and design consider-

ations for epoxy silver "solders" andconductive epoxy paint are given in afour -page information bulletin. The re-port describes a new silver cond ictivepaint and six different formulations of"epoxy solder."

CAPACITORS 310Capabilities and specifications on

Cerol Capacitors, are provided in thisbulletin. The capacitors are rolled cer-amic types in the high capacitancerange of paper and plastic film dielec-trics but are considerably smaller insize. Aerovox Corp.

MOTORS 311

Standard fractional horsepower mo-tors, normally carried in stock, are list-ed in this revised six -page publication.List prices and motor characteristics arealso included. Westinghouse ElectricCorp.

INDUCTORS 312

Five new f -m stereo multiplex induc-tors and two new miniature i-f trans-formers are described in bulletin 611.The Multiplex coils are designed for,or can be used in constructing a multi-plex adaptor. Stancor Electronics, Inc.

WinegardANTENNA SYSTEMS

WINEGARD ELECTRONIC POWERTRONTV ANTENNAS-TUBE AND TRANSIS-TOR MODELS. World's first and mosteffective electronic TV antennas. MoreWinegard Powertrons have been in-stalled than all other amplified TV an-tennas combined. Choose from 3 tran-sistor or 3 tube models. Transistor mod-els for FRINGE areas (nearest T V orFM station some distance away). Tubemodels for MIXED signal areas (loca-tions with TV station close to set, andother stations far away ). Both Power-trona come complete with built-in ampli-fiers, all AC power supply. Patented an-tennas have exclusive "Tapered T"driven elements. electro-lens directorsystem. Six models, GOLD ANODIZEDfrom $74.95 to $104.95 list. Excellent forcolor or black and white.

ELECTRONICCUT -TO -CHANNEL POWERTRON YAGIS.Where you require the finest installation,motels, hotels, hospitals, institutions,deep fringe locations, there is no antennamade that compares to Powertron cut -to -channel yogis. Highest gain (28 DB),powered by transistor amplifier peakedfor perfect results. Six (8 element) cutchannel and broad low band models-eight (12 element) cut channel and highband models. Run up to 8 antennas fromone power supply. ALL MODELS GOLDANODIZED. Perfect for color or black andwhite. Write for models no's. and prices.

Outtio°1ifs

BRANDED!THE BRAND NAML NW\ LuJOMEP.S KNOW AND TRUST

7 Winegard Electronic Products to Improve TV andFM Reception-nationally advertised month aftermonth after month in magazines, newspapers &TV.

pOPLARICS001,4 ,EcUio

WINEGARD ELECTRONIC STEREOTRONFM ANTENNAS. For the ultimate in longdistance FM and STEREO, Stereotronis world's most powerful FM antenna.Comes with power supply and built-intransistor amplifier. Guaranteed to bringin 85% of all FM stations in a 200 mileradius over normal terrain with rotor.Has minimum gain of 26 DB over foldeddipole. Recommended for use where sig-nals are from 1 to 20,000 microvolts.GOLD ANODIZED. Model PF 8 (300 ohm)or PF 8C (75 ohm), $64.25 list.

WINEGARDELECTRON CTURNSTILEFM ANTENNA

Non -directional, has 16 DB gain, re-ceives in all directions to 125 miles . . .

no rotor needed. Has built-in transistoramplifier and comes complete with powersupply. GOLD ANODIZED, built to lastfor years of service. Complete with two300 ohm terminals on amplifier; one fordown -lead connection to the set and onefor connection to a Powertron antenna.Model PF-4 (300 ohm). $55.80 list

WINEGARD TENNA-BOOST. Mounts onany antenna. Excellent antenna ampli-fier mounts on antenna, mast cr wall.Has 19 DB gain. All AC power supplybuilt-in two set coupler. Next best thingto Winegard Powertron.Model MA -30C,534.95 list.

WINEGARD "BOOSTER -PACK" SingleSet Amplifier or Home System Amplifier.Demonstrate right at set with unique"convincer" switch that switches fromantenna only, to half power and fullpower. See the picture improvementwith the touch of a switch. Takes only acouple of minutes to install. Has 16 DBgain on low band and 14 DB en highband. Transistorized, costs only 27c ayear to operate. Model AT 6X, $34.95.

WINEGARD"BOOSTER -COUPLER"

Signal booster and setcoupler combined. Has

one tube, 4 sets of no -strip terminals, on -off switch, antenna disconnect plug.tuns 1-4 sets. All AC-no hot chassis.nstalls anywhere. WBC-4X, $27.50 list.

For free technical bulletins, write today.

WinegaANTENNA SYSTEMS

30" 9-8 Kirkwood Street13Jr iigton, IowaOiigincoors of Gold Anodzed TV &FM antennas-makers of the WorldFcmaul Color'Ceptor TV antenna.

AUGUST 1962. . for more details circle 44 on page 46

47

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AUGUST 1962 49

NEW PRODUCTSI t

TAPE CLEANER 200Rapid cleaning of both blank and re-

corded tapes is accomplished by themodel E magnetic -tape cleaner. The unit

removes lint, dirt, loose u itle, or M Oarparticles from both sides of the tape.The cleaning process is entirely dry, re-quiring no hazardous solvents, and itdoes not affect the data stored on thetape. In addition to tape cleaning, thisunit functions as a tape rewinder. Di-mensions 19x14x8 in. and can be rackmounted or used as a portable tablemodel. Cybetronics, Inc.

DYNAMIC MICROPHONES 201Especially designed for heavy-duty in-

dustrial use, Model 551, is said to stand-up under extreme conditions. Can be

shifted to high or low impedance, thechoice being made by simply changingone wire on terminal strip inside micro-phone. Has a shielded transformer forvery low hum pickup and high signal -to -hum ratio. The Astatic Corp.

POWER SUPPLIES 202Factory wired d -c power supplies,

EC -1 and EC -2, are designed as port-able 5 amp units. Specifications for theEC -2 include: d -c output, 0-16 v, ripple,

FOR MORE INFORMATION CIRCLE PRODUCT NUMBERS ON PAGE 46

less than 0.5% at 5 amp, regulation,1.8 v/amp (no-load to F. L.) and aweight of 9 lb. The EC -1 features a12 v output, 1.4 v/amp regulation and aweight of 10 lb. EC -2 $39.95, EC -1$29.95. Electro Products Labs, Inc.

SOLDER TOOL 203This plier action soldering tool grips

the pieces to be soldered. Pressing the

handle controls all three basic solderingoperations: grip, heat and hold. Poweredby a 250 w dual heat transformer, thatpermits either high or low controlledheat temperatures, the "Mark V" TritonTool is furnished with removable taperedCarbon Tips. Triton Mfg. Co.

VARIABLE TRANSFORMERS 204A heavy-duty type Power stat provides

greater flexibility in application, connec-tion, installation, ordering and inspection.

The I156D-1256D series are availableas single units or as standard ganged as-semblies up to nine units parallel, eithermanually -operated or motor -driven. Asmany as twenty-seven units can beganged and mechanically interlocked forrequirements up to 244 kva. Availablefor 120, 240 or 480 v, single and threephase service with current ratings up to405 amp. The Superior Electric Co.

EDUCATIONAL FILM 205A 25 minute color sound film, titled

"The Finco Horn of Plenty," is designedto be of assistance to the service dealerby pointing out various ways to increaseTV antenna sales. Done in a semi-

humorous style, the film is both enter-taining and educational. Available with-out charge to distributors and servicedealer groups. Finney Co.

CRANK -UP TOWER 206I he No. 6 Tower is now available as

a "crank -up" type in heights from 18to 54 ft. A winch and cable is used tolift the various sections upward withease and safety. The tower, availablein heights of 18, 26, 37 and 54 ft, is

completely hot dipped galvanized. RohnMfg. Co.

NOISE SUPRESSOR 207Automatic noise suppression circuitry

for tube -type two-way mobile radios andbase stations operating on low band(25-50 mc) frequencies has been an-nounced. Known as "Extender" Opera-tion, the circuitry blanks out vehicleignition noise interference to increaseuseable communication range and im-prove message clarity in heavily con-gested traffic areas. The circuitry elim-inates ignition noise interference causedby the radio -equipped vehicle and allother vehicles in the same area. De-signed to operate with "T -Power" radioand "Twin -V" radio lines and all base

stations operating on low band chan-nels. Motorola Inc., CommunicationsDiv.

SEMICONDUCTORS 208Thirteen new types of semiconductors

serve as the basis of a complete line of"universal" entertainment replacementparts. Heading the new product groupare eight universal replacement transis-tors which reportedly can be used inlieu of at least 700 known domestic andforeign types originally installed in ra-dios and other entertainment equipment.Numbered GE -1 through GE -8, thesetransistors include four PNP and fourNPN types. They are designed for serv-ice as mixer -oscillator converters, and asa -f, high -power a -f, and i-f amplifiers.Also available are power rectifier, typeGE -504, with a 45 amp surge ratingwhich needs no surge limiting resistor,and four crystal diode types. Thesetypes, 1N34AS, 1N60, 1N824 and 1N295,


Old New

Now, RCAVICTOR takes the tangleout of TV's toughest circuitry

tThe advantages of the newRCA Security Sealed ChromaCircuits are plain to see. Thesimple fact that they're PrecisionCrafted Security Sealed boardstells you most of the good news. . . clean; easy to get at; "road-

map" tracking, and just gener-ally a cinch compared to theirold, hand -wired counterparts.

This newly developed RCAchroma board sets many morebenchmarks. For example, thecolor bandpass amplifier circuit

operates near Class "A," provid-ing linear amplification ofchroma signals. Color video am-plifier outputs are 100% DCcoupled to reduce drift in colortemperature set-up.

The chroma circuit also fea-tures two new multi -grid pen-tode color demodulators toimprove color with better ma-trixing. No "short cuts"-this isfull -function circuitry...demod-ulators plus amplifiers for extracolor brilliance and stability!

Vsk

This circuit is very stable, andtube change has almost no effecton performance of matrixing.

The new Precision CraftedSecurity Sealed Chroma Circuitboard is part of RCA's continu-ing program for faster, easierservicing of today's fastest -grow-ing home entertainment me-dium ... Color TV.See Walt Disney's "WonderfulWorld of Color" Sunday's, N BC-

TV Network.

The Most Truster,' Name in Television

AUGUST 1962 51

TESTS PROVE POLYCAP CASE PRODUCTNEW PRODUCTS

NEWS

AND SPECIAL END SEAL ON FROM

AEROVOX BI -ELECTRIC MYLAR

PAPER BYPASS CAPACITORS ELIMINATE

CRACKING AND CHIPPING PROBLEMS

Why take chances with the cracking andchipping problems common with con-ventional dipped capacitors. After all,your profits and your reputation are atstake with every set you service- pro-tect both by replacing with only genuineAerovox BiElectric Mylar' Paper BypassCapacitors! You see, actual tests provethat the uniform, protective Polycap casefrom end -to -end, and the special process -controlled end seals, eliminate yourcracking and chipping troubles. Nowasted time...no expensive call-backs,as service technicians everywhere knowfrom experience.

Alt.autur

.:l10141, r-k.ii.41,44°

Aerovox 81 -Electric capacitors are packaged in

handy see-thru plastic bags for your convenience... sealed for your protection.

This photo of an actual test shows the extensivedamage to a dipped capacitor when tied to anAerovox unit and the two were pulled apart. Notethe full protection of the Aerovox Polycap caseand spec al end seal.

Look for this famous Bi-Electric stand at your dis-tributor's store ... headquarters for the completeline of top-quality Aerovox capacitors. resistorsand kits.

Free technical dataAsk your Aerovox Dis-tributor for a free copyof Bulletin NH -118.And be sure to specify"Aerovox only" everytime you order.

'Registered DuPont trademark

REMEMBER-it pays to use Aerovox!

EROVOX AEROVOX CORPORATIONDISTRIBUTOR DIVISION NEW BEDFORD, MASS.

Technical Leadership - Manufacturing Excellence. for more details circle 10 on page 46

will serve as replacements for 98%of the wide variety of crystal diode typesnow used in entertainment equipment,according to the manufacturer. GeneralElectric Co.

CB TRANSCEIVER 209A 12 -channel CB transceiver, the Hall-

mark 2-12, has a frequency range of26.965 mc to 27.255 mc. It features

useable sensitivity to better than 0.3 my.It is said adjacent channel rejection is

better than 30 db with r -f output over3 w. Provides 12 crystal controlled chan-nels. push -to -talk operation, illuminated"S" meter. and sensitive, adjustablesquelch. Has a dual power supply, 12

vac or 115 vdc. Texas Research andElectronic Corp.

ULTRASONIC CLEANING 210A standard line of ultrasonic clean-

ing systems provides a selection of 10

generators and 16 transducerized cleaning

tanks featuring automatic control. Thesesystems which range from 90 to 1000w with tank capacities up to 45 gal.generate ultrasonic frequencies of 40and 20 kc in cleaning solutions. SonicSystems. Inc.

ELECTRONIC TECHNICIAN

Again /B K/Makes ServicingEasier... More Profitable!

NEW!

IN

DYNA-TESTERTUBE

TESTER VOM

Model 625

CRT

Unique new B&K design now simplifies serv-icing in the home or in the shop. CombinesTube Tester, Volt-Ohm-Milliammeter, andCathode Rejuvenator Tester in one compact,professional quality instrument-at low cost!LT TUBE TESTER SECTION is fast and accurate.

Tests the newest tube types as well as all of theold commonly used tubes in TV and radio sets.Tests the Nuvistors and Novara, the new 10 -

pin tubes and 12 -pin Compactrons. Tests voltageregulators, thyratrons, auto radio hybrid tubes,European hi-fi tubes, and most industrial types.Checks for all shorts, grid emission, leakage andgas. Provides adjustable grid emission check withexceptional sensitivity to over 100 megohms. Checkseach section of multi -section tubes separately.Checks tube quality and capability of cathodeemission under current loads simulating actualoperating conditions.

VOM SECTION provides the 7 most -usedranges for convenient TV testing:3 DC Ranges: 0-10, 100, 1000 volts3 AC Ranges: 0-10, 100, 1000 volts1 Resistance Range: 3 k center scaleCRT SECTION spots picture tube troubleand corrects it in a few minutes right in thehome, without removing tube from set. Testsand rejuvenates picture tubes at correct fila-

ment voltage from 1 to 50 volts. Checks for leak-age, shorts, and emission. Removes inter -elementshorts and leakage. Restores emission and bright-ness. (Checks and repairs color picture tubes withB&K Accessory C40 Adapter.)

Model 625 Dyna-Tester complete in handsome,lightweight, leatherette -covered carry -case.Size: 1134" x 15" x 4W. Net, $13995See your B& K Distributor, or Write for Catalog AP20-7"

Trait -Saving, Money -Making Instruments Used by Professional Servicemen Everywhere

Moc., 360 Transistor Model 360 V 0 MaticRadio Analyst Automatic VOM

Model 375 DynamaticAutomatic VTVM

See Your B&K Distributoror Write for Catalog AP2O-T

Model 1076 Model 440 CRTTelevision Analyst Rejuvenator Tester

BIB a IC MANUFACTURING CO.

Division of DYNASCAN CORPORATION1801 W. BELLE PLAINE AVE. CHICAGO 13, ILL.Canada: Atlas Radio Ccrp., 50 Wingold, Toronto 19, Ont.Export: Empire Exporters 277 Broadway, New York 7, U.S.A.

AUGUST 1962for more cktails circle 16 on page 46

53

G -E reporter, Roland Kemptona new definition forService -Designee' capacitors

discovers

---4r40;0401.^00,kier

"'

E

"Gas Savers". . .

that's what John Crocker calls G -ESER VICE -DESIGNED capacitors, because he can

fill 70% of his replacement needs with just 20 typesHere's how John Crocker, owner of CROCKERTELEVISION AND RADIO SERVICE, FortWayne, Ind., figures the day-to-day advantages ofG -E Service -Designed capacitors:

"In these days of watching each leak in overhead,we have calculated that G -E Service -Designed capac-itors save us gas and time whenever we can justreach over to the rack and pull out the capacitorfor the job. We call them gas savers. Our edge -of -town location means one hour of a man's time, plusthe wear and tear on equipment, whenever we haveto rush to the distributor for an exact replacement.Over a period of months this can run into a lot ofunnecessary expense."

It pays to stock G -E Service -Designed capacitors.Save gas. Save time. Reduce costs and inventoryrequirements. Speed customer service.

Get all of the facts, including the most completecapacitor catalog and replacement guide ever pub-lished, from your G -E capacitor distributor. Ask forETR-2600, or write to: General Electric Company,Distributor Sales, Electronic Components Division,Room 1754, Owensboro, Kentucky.

73oress- /s Our Most Important Product

GENERAL ELECTRIC

54



...INEW PRODUCTS-40TV CAMERA 211

A low cost transistor camera, theTC-1, has been developed for closed-circuit TV systems. The camera re-

portedly can be operated as easily as ahome movie camera, and requires nospecial training. Lens opening and focusare the only functions to be controlled.$850. Blonder -Tongue Laboratories. Inc.

SOLDERING IRON HOLDER 212The Model H-200 soldering iron

holder reportedly meets industry's safetyrequirements for a holder which does

not allow the soldering iron to build uphigh idle temperature which tends toshorten both the tip and element life.This unit is adjustable to various ironsizes. Features include a "Sta-tinned"solder cup which keeps the iron tipimmersed in solder when not in use.Base is 41/2 in. dia and height is 51/2in. SI 95 each. Macdonald & Co.

F -M ANTENNA 213A 7 -element t-rn antenna, the "Mark

stereo 7" is omnidirectional, horizontallypolarized and unaffected by guy wires.Designed for stereo multiplex reception,the unit may be mounted indoors, as wellas outdoors. The antenna is 30 x 22 x51/2 in. deep and comes complete withall hardware for mounting. B&K Mfg.Co.

SOLENOIDS 214A solenoid designed to eliminate a -c

hum, employs a trim -tab that enablesthe user to adjust the unit for minimumhum at time of installation. Field ad-justments, if necessary, can be made inseconds with a screwdriver. Productionis presently limited to a few sizes, but

will shortly he increased to include awide range of sizes and styles. Ander-son Controls, Inc.

VARIAC 215The latest addition to the Variac line

is a cased 5 -amp unit with a meter toindicate output voltage. The TypeW5WT3VM incorporates all the standardVariac features: pat en t e d Duratrakbrush -track coating to prevent oxidation,rugged construction, ability to withstandshort-term overloads up to 1000%, andprotective thermal trip device. Operatesfrom 120 v, 50-60 cps, providing outputvoltage continuously adjustable from 0to 140 v, at 5 amp max. The meter in-dicates output voltage ± 3% of full

scale. With the output control set atline. the meter monitors input voltage.$54.00. General Radio Co.

TAB ADJUSTER 216Quick twisting of tabs on electrolytic

capacitors is permitted with a new serviceaid. Called "Capacitor Tab Adjuster."it is claimed the tool saves time in theshop and on service calls, and is easierto use than pliers. The adjuster lookslike a screw driver but has a slotted end

455j ELECTRONICS

John Crocker says:"Nis New G -E Plastic

Tool Case HoldsEverything You

Need for Service Calls"

This original G -E Service Aid isbig enough to tote the tools youneed on service calls. Put yourtools in this case and gain spacefor many more tubes in your tubecase. Large bottom compartmentmeasures 1514" x 734" x 4" deep.Two compartmented, self -open-ing trays are cantilevered to putall tools right at your finger tips.

This durable two-color case ismade of high -impact polystyrene.Won't warp. Resists grease, oil,salt water-even battery acid.Top cover overlaps to shed water.Over-all size: 1534" x 8" x 8%".Weight: 3 lb. 11 oz. Dealer listprice: $6.95. Ask your G -E elec-tronics distributor for ETR-3280or mail coupon to Chicago ware-house address shown.

A O, A.loot /7o,,,tne 73ockol

GENERAL Mi ELECTRICGeneral Electric Company, Dept. 17543803 N. Milwaukee Ave., Chicago 4, III.

Please ship prepaid:

_ ETR-3280 Plastic Tool Case, 56.95 each.

My check or money order is enclosed for the re-quired amount plus any soles or use tax applicablein my area.

Nome

Address

City Zone State

. . . for more details circle. 28 on page 46AUGUST 1962 55

Now in

breakproof

plasticutility case!

Case can be used forcarrying or storing tools,

parts and equipment-or asa lunch box. Made of

rugged polypropylene withself -hinge that won't rust.

Weller adds greater value to the Heavy Duty Soldering Kit witha new utility case of miracle plastic that won't break. Kit featuresthe Weller 275 -watt Soldering Gun used by electronic service tech-nicians the world over. Instant heat. Twin spot-lights. Long life, longreach tip-made of copper for superior heat transferand iron plated for long life. Also included in this $ 95kit are smoothing tip, cutting tip, tip interchangewrench and supply of solder. Model 8250AK.

t

Weller HI -Speed Sabre SawFor smooth, super -fast cutting of all kindson speaker and record player mountingboards, cabinets, walls, etc. Makes itsown starting hole for inside cuts. Neversplinters or tears wood. Heavy

$22"duty, 4.8 amps. Model 88. list

On sale at yourElectronic Parts Distributor

WELLER ELECTRIC CORP. EASTON, PA.... for more details circle 43 on page 46

NEW PRODUCTS

instead of a blade. The slot fits over thecapacitor mounting tabs and a quicktwist facilitates removing and installingcan -type capacitors. General ElectricCo.

TESTER -REJUVENATOR 217An all purpose picture -tube tester and

rejuvenator, model Cr-60, has been en-gineered to test all black and white, and

color picture tubes. Utilizes beam cur-rent test which checks all tubes for pro-portionate screen brightness by qualita-tive measurement of the electron beam.$64.95. Precision Apparatus Co., Inc.

WIRELESS INTERCOM 218A transistorized intercom system in

kit form is completely portable and hasno cables or wires to install. The two -station system operates by simply plug-ging into any a -c outlet or d -c powersource. Any number of additional sta-tions may he added. Each station is a"master." employing a large press -to -talk button which can be locked in the"on" position. No "on -off" switch is

provided since each station draws no


And it and Ax it in yi the time!EASILY SOLVES "TOUGH DOGS"... INTERMITTENTS ... ANY TV TROUBLE

MODEL TELEVISION1076 ANALYBLACK & WHITE AND COLOR

Just As Easy to Use As a VOM!By Easy Point -to -Point Signal Injection, You see the Troubleon the TV Screen and Correct it-Twice as Fast and Easy!Simplified technique stops lost hours never recovered on"tough dogs", intermittents, and general TV trouble-shooting. This one instrument, with its complete, accuratediagnosis, enables any serviceman to cut servicing time in half... service more TV sets in less time ... satisfy more custom-ers ... and make more money.With the Analyst, you inject your own TV signals at any time,at any point, while you watch the generated test pattern onthe picture tube of the television set itself. This makes it quickand easy to isolate, pinpoint, and correct TV trouble in anystage throughout the video, audio, r.f., it., sync and sweep sectionsof black & white and color television sets-including intermit -tents. No external scope or waveform interpretation is needed.Checks any and all circuits-solves any performance problem.Gives you today's most valuable instrument in TV servicing-proved by thousands of professional servicemen everywhere.Available on Budget Terms. As low as $30.00 down. ?net, $29995

a

SIMPLIFIES COLOR TV SERVICING, TOO

Enables you to troubleshoot andsignal trace color circuits in colorTV sets, or facilitate installation.

Generates white dot, crosshatchand color bar patterns on the TVscreen for color TV convergenceadjustments.

Generates full color rainbow dis-play and color bar pattern to testcolor sync circuits, check rangeof hue control, align color de-modulators. Demonstrates tocustomers correct color values,

Time -Saving, Money -Making Instruments Used by Professional Servicemen Everywhere

Model 960 Transistor Model 360 V 0 Matic Model 375 Dyna mat cAutomatic VTVMRadio Analyst Automatic VOM

Model 700 Dyna-Quik Model 440 CRT-ube Tester Rejuvenator Tester

See Your B&K Distributoror Write for Catalog Al- 20-T

B & K MANUFACTURING CO.Division of DYNASCAN CORPORATION

1801 W. BELLE PLAINE AVE. CHICAGO 13, ILL.Canada: Alias Radio Corp., 50 Wingold, Toronto 19, Ont.Export: Empire Exporters, 277 Broadway, New York 7, U.S.A.

. . . for more details circle 15 on page 46AUGUST 1962

57

NEW PRODUCTS

MAKE THE SOUND SYSTEMS YOU INSTALL

A TESTIMONIAL TO YOUR SERVICE

How does the word get around about sound.someone listens to a friend's system. wants nnelike it. Gets in touch with the man who it,stalled it. This happens -a dozen times easil- with each quality sound system you put in.Remember that no component has more to dowith the final result than the loudspeaker sys-tem. That's why it's smart to use the best -JBL. JBL units are more than just loudspeak-ers, they are precision transducers. painstak-ingly manufactured to meet tolerances usuallyreserved for scientific laboratory instruments.And they are backed by an unlimited warranty.Write for your free copy of thecomplete JBL catalog. You will findso complete a selection that bigsystem or small. simple or elaborateyou can supply the very best loud-speakers. Stick to JBL and the systemsyou install will continually build salesfor your service. If you run into aknotty problem, submit it to the JBLProfessional Customer ServiceDepartment. You'll get a prompt,positive answer.

JBL LE -14C COMPOSITETRANSDUCER Two-waydivided network systemwith 14" low frequencycone and 1%" high fre-quency speaker concentri-cally mounted, separatecrossover network. Install inwall, infinite baffle, or port -loaded acoustical enclosure.

Build yourreputation

with JBLprecision

transducersPRODUCTS OF JAMES B. LANSING SOUND.1Nr., ARE MARKETED BY JRI. INTERNATIONAL, L.A. 39. CALIF.


For your custom stereo installations

GO I goo .-9 off--.11111101111111=1,1**H-

THE FISHER 800-B

Three of the world's finest components on one chassis1 AM -FM -Stereo Multiplex Tuner: sepa-

rate tuning indicators for FM and AM;exclusive Fisher STEREO BEAM automati-cally shows whether an FM station is broad-casting in stereo.

2 High -Power Stereo Amplifier: 65 wattsmusic power; special center -channel

output connection for third speaker.

3 Master Audio Control -Preamplifier:complete, easy -to -use control system

assures total flexibility; provisions for everytype of input. Price $429.50*

Walnut or Mahogany cabinet 524.95;prices slightly higher in the Far West

USE THIS COUPON FOR DETAILED INFORMATION

Fisher Radio Corporation21-24 44th Drive, Long Island City I, N.Please rush the following FREE literature:

Complete specifications on the Fisher 800-BReceiver.

The 1962 Fisher Handbook, a 40 -page illus-trated reference guide and component cata-logue for custom stereo installations.

Name

Address

City

a.

Zone Statet

more power than an electric clock-amaximum of 4 v. Decorator -styledmoulded plastic cases 3 by 814 by 53/4in., are available in Eggshell White andOxford Gray. Basic system kit (2 units),$45.90. Single station kits, $22.95.Allied Radio Corp.

MULTIPLEX RECEIVER 219A complete high-fidelity f -m multiplex

stereo/ a -m receiver -amplifier featuresnew multiplex demodulation system. The

MX -7 includes f -m multiplex, an f -mtuner, an a -m tuner and a master control30 w stereo amplifier. Special featuresinclude a nuvistor r -f amplifier tuner andand a temperature -sensitive line currentlimiting resistor. All components report-edly are operated well within their maxi-mum ratings. Radio Corp. of America.

PIN STRAIGHTENER 220A pin straightener for five kinds of

receiving tubes, consists of a flat discof hard plastic 1/4 x 21/2 in. It contains

straightening -hole configurations for 7-,9- and 10 -pin miniature tubes, large -

circle 9 -pin tubes, and 12 -pin com-pactrons. Bright orange in color, it iseasily spotted on the workbench or in thetool case. Technicians who prefer tomount the straightener permanently cando so with the two screws supplied withthe device. $0.60. General Electric Co.

MICROPHONES 221I he r 513H Dynamic Microphone is

easily disassembled for field repair andis shielded against pick-up from stray

58

. . . for more details circle 25 on page 46ELECTRONIC TECHNICIAN

4 good reasons why...

0

0

0

0

SON my.RESEARCH MAKES THE DIFFERENCE

Is the Easiest TV to serviceThe remarkable SONY 8-301W TV is a serviceman's dream. Unlikeordinary sets, SONY TV is a pleasure to work on. An ordinary screw-driver lets you open the cabinet and expose the complete chassis.Standard trouble -shooting procedure isolates the defective component®. Snap out the circuit board, one of 3 on which nearly all SONYparts and transistors are mounted ® and send it off to SONY ®That's all there is to it. Within a surprisingly short time, the board,with the defective component replaced, will be returned, and the setwill be as good as new. Cost? Low enough to return you a full profitand keep a customer satisfied.

SONY CORP. OF AMERICA '

514 Broadway, New York 12, N. Y.

Regional OfficesCentral: 4959 W. Belmont Ave., Chicago 41, III.Western 627 South Towne Ave., Los Angeles 21, Calif

Sony Corp. of America, Dept. 7 514 Broadway. New York 14. N. Y.Gentlemen: I am interested in the SONY portable television. Please rush

full details.

STORE NAME

NAME TITLE

ADDRESS

CITY ZONE STATE

. . . for more details circle 38 on page 46AUGUST 1962 59

RFOR "DOCTORS OF

SERVICING"

c(E.4ti

.nc,°N;40 ,'e4 rts

The ProfessionalService Man's

Cleaner

on emergencycalls,,,

Be sure to spray Shield on elec-trical contacts and switches. A few

squirts of this trouble-shooter extraor-dinary before servicing cleans the set clean-er, lubricates it better-often cleans up thetrouble at once. A "shot" after servicingprovides sure -shot protection that lasts.Silicone Base means Total Cleaning Power.Write for handy guidebook to better clean-ing. Channel Master Corp., Ellenville, N.Y.

FREE! 7" extension tube with everycan! Reach everything easy!

C 1962 CMC

for more details circle 19 on page 45

SOrithWAYS 70

1:1771171

MOMS

Get into the all -year-round commercial sound trade and doaway with seasonal repair work slumps! This steady -profitbusiness-sales, installation and service- is available rightin your own neighborhood! Factories, restaurants, schools,offices, bowling alleys ... outdoors, athletic fields, swimmingpools, etc.... all are prospects for you.

Atlas Sound products, built to quality standards and backed byover 25 years of "know-how", are insurance for your reputation.Your Atlas Distributor can supply you with a complete line ofperformance -proven job -rated equipment: speakers, mike standsand related accessories for a professional sound installation.

Write for latest catalog and names of Atlas Distributors.

ATLAS SOUND DIVISIONAmerican Trading and Production Corporation1419-51 39th Street, Brooklyn 18, New YorkIn Canada: Atlas Radio Corporation, Toronto


NEW PRODUCTS

fields. The high impedance, high out-put unit can be mounted either hori-zontally or vertically. Made of high im-pact lightweight plastic. Astatic Corp.

WANTED

Ronald Willis Terrentine is beingsought by the Federal Bureau ofInvestigation for "unlawful flight

RONALD WILLIS TERRENTINE, alias GeorgeCollins, Melvin Collins, Ronald W. Terrentine,Ronald Terrentine, Roland Terrentine,

to avoid confinement for the crimeof armed robbery." While an inmateof the Ohio State Penitentiary, Ter-rentine took courses in electronicsand may be employed as a radio ortelevision repairman.

On July 29, 1955, he escapedfrom the London Prison Farm, Lon-don, Ohio, where he was serving a10 to 25 year sentence for armedrobbery. On September 20, 1955,a Federal warrant was issued forhis apprehension because of his es-cape. Since he was carrying a load-ed .45 caliber automatic at thetime he was arrested for armedrobbery, he should be consideredarmed and dangerous.

Terrentine is a Negro Americanand was born on June 16, 1923, atCleveland, Ohio. He has also in-dicated his date and place of birthas June 16, 1921, Cleveland, Ohio.He is 5'81/2" tall, weighs approxi-mately 170 pounds, has black andkinky hair, brown eyes, a mediumbuild and brown complexion. Hehas scars on his right thigh, left sideof upper lip, center of back andback of right shoulder. He also has abump on his right shoulder and twodog bite scars on his right leg, andmight possibly wear glasses.

Should you learn of this fugi-tive's whereabouts please notify thenearest FBI office immediately. TheFBI's telephone number appearson the first page of all local tele-phone directories.


REPS ANDI DISTRIBUTORS

Lesa of America Corp. announces theappointment of representatives to sellits complete line of phonographic ma-terials. The new reps are: Jack Geart-ner Co., Miami Beach, Fla.; Heaton &Keyser, Inc., Redwood City, Calif.; SamLittle Co., East Point, Ga.; August J.Nelson Co., Ellicott City, Md.; Prihhle& Associates, Dallas, Tex.; WaxmanCurrant Sales, Buffalo, N. Y. and MartinWeinberg Associates, Philadelphia, Pa.

Olympic Radio & Television SalesCorp., establishes a Special Radio SalesDiv. to expand distribution of radio andportable phonographs. The new divisionis established in response to growingactivities of stamp plans and other spec-ial dual distribution outlets.

Electronic Industry Show Corp. re-veals that the Electronic Parts Distribu-tors Show will continue in its presenttradition. A report prepared by Profes-sional Research Associates, Inc., indicatesthat the needs of both manufacturers anddistributors can be served best by holdingonly one annual distributor show.

The m.mth of May is the preferredtime and a central location appears tobest serve industry needs.

Sprague Products Co., the wholly -owned electronic distributors' supply sub-sidiary of the Sprague Electric Co., ap-points Arthur Lassers as sales manager.Mr. Lassers will be responsible for thesale of capacitors, transistors, resistors,transformers and other electronic com-ponents through a network of over 1000replacement and industrial electronicparts distributors in the U. S.

Ortho Industries Inc., Paterson, N. J..;announces the appointment of LeonardD. Allen, Inc., Syracuse, N. Y., as salesrep covering New York State, exclusiveof the metropolitan area. Allen, whoalso maintains offices in Buffalo andVestal, will handle the entire Ortho lineof products including filters, transform-ers, rectifiers and power supplies.

Sylvania Home Electronics Corp. ap-points John R. Willey, manager of dis-tribution for commercial products. Mr.Willey will be responsible for distributionof the company's closed circuit TV sys-tems, and other commercial electronicproducts. He will also coordinate theSylvania hospital television leasing planwith American Hospital Supply Corp.

Alpha Wire appoints August J. NelsonCo. as representative covering Marylandand the District of Columbia. Mr. Nel-son was formerly associated with Be-Esco Sales of New York who representedAlpha in this territory for several years.Be-Esco has recently announced theirwithdrawal from this area and as a re-sult Mr. Nelson has formed his own in-dependent sales organization coveringthis same market.

New Business OpportunityFor Independent Servicemen

Mr. A. D. MayoOrlando, Florida

Mr. H. SeidenAlbany, New York

Mr. J. BlumenthalDetroit, Michigan

Mr. M. GoldweberCleveland, Ohio

Mr. A. SmelandCamden, New Jersey

Mr. J. ErricoTrenton, New Jersey

Join These Former ServicemenWho Now Own Successful

Lafayette Associate StoresYou can join these and the other 28 men who now know the true independence and security

that comes from owning your own business. As a franchised Lafayette Radio ElectronicsAssociate, you benefit from more than 40 years experience selling hi-fi components, citizen

band radios, recorders, science and electronics kits, tools, hobby supplies, TV repairequipment and all the other things that make this the fastest -growing industry in thecountry. You'll have your own exclusive marketing area and the same guidance andadvertising support that has helped many men such as you (some with little or no business

experience) become successful business leaders. If you have a basic knowledge of radio,television or electronics, and you're willing to invest from $10,000 to $30,000 to get thethings you've always wanted out of life, mail the coupon today for further information.

Lafayette Radio Electronics Corporation111 Jericho Turnpike, Syosset, L. I., New York

Mr. Robert LaubPlease send me full information on how I can own my own profitable business.I understand there is no obligation.

NAME_ __

ADDRESS

CITY ZONE SLATE

ET 871

-J. . for more details circle 31 on page 46

61AUGUST 1962

A.C. Household ElectricityAnywhere . . . In yourown ear, boat or planeOperates Standard A.G. Record PlayersDictating MachinesSmall RadiosElectric ShaversHeating Pads, etc.

PLUG-IN TYPEPORTABLE

INVERTERS'MODELS6.RMF (6 volts) 60 to 80watts. Shipping weight 12lbs. DEALER NETPRICE $33.0012TRME (12 volts) 90 to125 watts. Shipping weight12 lbs. DEALER NETPRICE..... . $33.00*Additional Models Available

"A" Battery

ELIMINATORFor Demonstrating and

Testing Auto Radios-TRANSISTOR or VIBRATOR

OPERATED!Designed for testing D.C.Electrical Apparatus on Regular A.C. Lines-Equippedwith Full -Wave Dry Disc -Type Rectifier, assuringnoiseless. interference.freeoperation and extreme longlife and reliability.

MAY ALSO BE USED AS A BATTERY CHARGERMODEL 610C-ELIF . .. 6 volts at 10 amps. or 12 voltsat 6 amps. Shipping weight 22 lbs.

DEALER NET PRICE $49.95MODEL 620C-ELIT ... 6 volts at 20 amps. or 12 volts at10 amps. Shipping weight 33 lbs.

DEALER NET PRICE . . $66.95

AUTO -RADIO

By every test ATR Auto -Radio Vibrators are best!

. . . and feature CeramicStack Spacers, Instant Start-ing, Large Oversized TungstenContacts, Perforated Reed,plus Highest Precision Construction and Workmanship andQuiet Operation}

There Is an ATR VIBRATOR forevery make of earl

Ask your distributor for ATR's Low Priced type 1400.6 volt 4 -prong Vibrator; and 1843, 12 volt 3 -prong; or1840, 12 volt 4 -prong Vibrator. THE WORLD'S FINEST!

UNIVERSAL

KARADIOMODEL 600 SERIES

Easily installed in -dash orunder -dash. Amplifier pow-er -supply chassis may beseparated from tuner chassis

for installation flexibility and easy servicing. Utilizes 6.rube super heterodyne circuit (2 dual-purpose tubes) with8 -tube performance . . . pulls in those distant stationswith good tune and volume. Supplied with separate 5"x 7" speaker which is installed in original automobilespeaker compartment for high fidelity performance. Neu.tral gray -ten baked enamel finish. Over-all size 4" deepx 61/2" wide x 2" high. Tuner Chassis; with AmplifierChassis, 21/2" deep x 61/2" wide x 37/e" high. Shippingweight 7 lbs. WILL OUTPERFORM MOST SETS!Model 612-12 volt Dealer Net Price S3I 96Modal 606- 6 volt Dealer Net Price 131 96

Mounting° under Cab

TRUCK

KARADIOExcellent Tone,Volume, and Sensitivity!Compact, yet powerful. Fitsall trucks, station wagons.most cars and boats. Just drill a % inch hole in roof andsuspend the one-piece unit (aerial, chassis and speaker)in minutes. Watertight mounting assembly holds antenno upright. Yoke -type bracket lets you tilt radio to

anyangle.

Extra.sensitive radio has 6 tubes (2 double -purpose).over -size Alnico 5 PM speaker for lull, rich tone. Big,easy -to -read illuminated dial. Fingertip tuning control.Volume and tone controls. 33 -in. stainless steel antenna.Neutral grey -tan enameled metal cabinet. 7 x 6)/a x 4 in.high over-all. Shipping weight 101/2 lbs.Model TR-1279-12 A for 12V Dealer Net Price $41.94Model TR-1279- 6A for 6V Dealer Net Price $41.94

I

NO PRINTEDCIRCUITRY

SEE YOUR ELECTRONIC PARTS DISTRIBUTORWRITE FACTORY FOR FREE LITERATURE...

ATR ELECTRONICS, INC.ormerly American Television & Radio Co

Ouatity Products Since 1931ST. PAUL I, MINNESOTA-U.S.A

ASSOCIATION NEWS

FloridaTSDA, St. Petersburg, is preparing

for a half hour program "Good TVService Costs Money," in cooperationwith WSUN-TV. This is an initial jointpublic relations effort in the locality.

IndianaFESA, Fort Wayne, reports their res-

ignation from NATESA. In a letter toexecutive director Frank Moch, FESAsaid " . . . we feel the only solutionto the discord in NATESA is for FrankMoch to resign as executive director ofNATESA. . . . There is only one al-ternative for FESA. That is to resign."

IESA, Elkhart, has also severed itsaffiliation with NATESA. Reasons givenfor the resignation was a general dis-satisfaction with the manner in whichNATESA is being operated and the lackof worthwhile accomplishments on a na-tional basis.

IESA, Indianapolis, reports that largecable TV companies are fighting forthe right to install cable TV systems innorthern Indiana. IESA says the systemsare not needed in this area and thatry antenna installers and technicianswill be driven out of business. Althoughthe cable companies say they do noservice work, interviews with customersand technicians in Illinois, where thesystem has been in effect for about aear, indicate this is contrary to the

facts.

New YorkI ISA, Buffalo, conducted a success-

ful color course for local technicians.\ large turnout of both members andnon-members was reported. The clinicwas held for the purpose of laying thefoundation for more advanced futureclinics on color servicing.

OhioI SA, Columbus, announces that

their state organization has withdrawnmembership from NATESA. No detailsare given at this time.

PennsylvaniaESDA, Pittsburgh, has called for a

hearing on their expulsion fromNATESA. It was reported that Mr.Moch, NATESA executive director,would not comment until he reviews acopy of the charges.

TESA. Pittsburgh, "rendered a com-plete vote of confidence" in NATESAby unanimously voting for membershipin the national organization. TESA willhe filling the spot left by ESDA whentheir relations were severed byNATESA

TSA, Philadelphia, received a letterfrom Arthur H. Lassers, sales managerof Sprague Products Co., supportingTSA's stand against the city magistratewho belittled TV technicians in acrowded court room. A full report waspublished in the May issue of ELEC-TRONIC TECHNICIAN Magazine.

NEWSIIMMINUM114

OF THE INDUSTRY

Electronic Chemical Corp. appointsDavid Schneider as general manager.The firm produces a "No -Noise" line

which includes a Volume Control andContact Restorer.

Raytheon Co. announces that its Uni-line receiving and picture tubes havebeen awarded the Good HousekeepingSeal of Approval. As the only inde-pendent tube manufacturer to receivethe Good Housekeeping Seal, Raytheonis making available, through distributors,to all radio and television dealers, awindow and in-store display featuringthe new consumer identification. The"seal" will be shown on all entertain-ment -type Raytheon receiving tubes andcartons.

Pacotronics, Inc. appoints Samuel J.Piaser as sales promotion manager. Inhis new capacity, Mr. Piaser will handlethe sales promotion activities of all threesubsidiaries, Precision Apparatus Co.,Inc.; Paco Electronics Co., Inc. andPace Electrical Co., Inc.

Sylvania Electric Products Inc., an-nounces it is resuming production ofcolor television picture tubes. The com-pany previously produced and marketedcolor tubes from 1953 through 1957. Ac-cording to a company spokesman, a 21in., 90 degree, shadow mask, round glasstube will be available in 1963. Thetubes will be manufactured at SenecaFalls, N. Y., headquarters of Sylvania'sPicture Tube Operations.

International Resistance Co., St. Peters-burg Div. appoints Abraham Osbornquality control manager. IRC also an-nounces the appointment of G. JackWilson as marketing manager of theFlorida operation.

Zenith Radio Corp. estimates net con-solidated profits of $4,728,794 for thethree month period ended March 31,1962. This is 37 percent higher than the$3,446,030 reported for the same periodlast year, the company's second best

. for more details circle 14 on page 46


first quarter, and 23 percent ahead ofthe record first quarter earnings of$3,855,129 reported for 1960. Firstquarter earnings, after estimated taxes of$5,421,043 are equivalent to 52' petshare on the 9,033,177 shares outstandingat March 31, 1962, as compared to firstquarter earning of 39( in 1961 and43( in 1960 on the shares then outstand-ing, adjusted for the three -for -one stockdistribution effective Nov. 3, 1961. Pro-duction and factory unit shipments ofZenith's black and white television re-ceivers are the highest of any quarterin the company's history.

TV Programs from FranceAnd England Received inU. S. via Telstar Satellite

International TV transmissionand reception via a communicationssatellite became a reality in July.After preliminary experiments withtelephone conversations via the sat-ellite Telstar, TV broadcasts weremade direct to the United Statesfrom France and England.

Project Telstar is a cooperativeeffort of the National Aeronauticsand Space Administration (NASA),and the American Telephone &Telegraph Company (AT&T). Cost

COMMANDAND

TELEMETRYANTENNA

coon.%RuALARG

, .maw«TRACKINGANTENNA

of the project is being paid byAT&T,. who designed and con-structed the satellite.

The 34 in. sphere, weighing about170 Ib, carries receiving equipmentand a broad band transmitter havingan output of approximately 21/4 w.It contains only one electron tube,a one -foot long traveling waveamplifier tube, and has 1064 tran-sistors and 1464 diodes.

Power to operate the receiverand transmitter is supplied by 19rechargeable nickel -cadmium cellswhich are charged by 3600 solarcells mounted on the satellite's skin.

The receiver is tuned to 6390 Mcwhile the transmitter radiates a sig-nal on 4170 Mc.

A second communications satel-lite in the Telstar Project is expect-ed to be orbited in the near future.

But try us on Auto Radio Controls!Although your CENTRALAB distributor isyour best source for auto radio controls,he won't be of much help to the characterwith the flat tire. The comprehensiveCENTRALAB auto radio control line onlygoes back to 1942 model automobiles.

From 1942 on, though, it's a different story.CENTRALAB is the only control manufactureroffering a complete line of exact replacementauto radio controls . . . not to mention SPon/off switches. They cover 202 differentautomobile models, domestic and foreign.

CENTRALAB auto radio controls are listed inCOUNTERFACTS and PHOTOFACTS, as well asin the Sams Industry Control Guide.

Changing tires is man's work, but changingauto radio controls is child's play-with'CENTRALAB exact replacements.

Ce ab.1:1*

PHOTO: BETTMAN ARCHIVE

8-6234

THE ELECTRONICS DIVISION OF GLOBE -UNION INC.

902H EAS' KEEFE AVENUE MILWAUKEE I, WISCONSIN

In Canada Centralab Canada Ltd P 0. Box 400. Aiax, Ontario

ELECTRONIC SWITCHES VARIABLE RESISTORS CERAMIC CAPACITORSPACKAGED ELECTRONIC CIRCUITS ENGINEERED CERAMICS

for more details circle 18 on page 46AUGUST 1962 63

NEW BOOKSTHE INDUSTRY'S

ONLY COMPLETE

"LOOK -ALIKE" LINE

OF BOTH NEEDLES

AND CARTRIDGES!

Gat N.6%

150 Exact

Replacement

Cartridges

300 ExactReplacement

Needles

:;peeds your phonoservice ... assures consistent

high quality and completecompatibility of needles and

cartridges. Inventory and handlingcosts are cut to the bone. And the

industry's greatest array of sales tools-cross-reference catalogs, wall charts,

displays and merchandisers - isavailable to suit your requirements.

Ask your E -V distributor, or sendcoupon for profitable details, today.

ELECTRO-VOICE. INC., Dept. 8271Buchanan. MichiganPlease send my free needle and cartridge catalogsplus name of 1 distributor.

Name

Address_ -

city State J. . . for more details circle 23 on page 46

64

Nab

HINTS and KINKS FOR TV, RA-DIO, AUDIO. Edited by MartinClifford. Published by GernsbackLibrary, Inc. 128 pages, soft cover.$2.35.

Hundreds of gimmicks and gad-gets for TV, radio, and audio equip-ment, shops, and instruments arepresented here. They have beenselected from items previously pub-lished in periodical form. Manywill interest technicians; some willprobably be used to substitute forunavailable gadgets that could sim-plify a particular task.

BENCH SERVICING MADEEASY By Robert G. Middleton.Published by Howard W. Sams &Co., Inc. 160 pages, soft cover.$2.95.

Prolific author Bob Middletonoffers a great number of timesavingTV service methods here. He pre-sents detailed troubleshooting stepsin various circuit areas of TV setsto illustrate how to track down adefect quickly. Many fine drawings,schematics and photos accompanythe excellent text, including num-erous scope traces. This is an espe-cially fine book for learning how toincrease bench repair efficiency.

ELECTRONIC ENGINEERSM ASTER. Publiithed by Tech Pub-lithers, Inc. 2090 pages, hard cover,or microfilm, $15.

"The difficult lobs we do immediately-theimpossible ones we haul down to the shopl"

EARN EXTRA

SUMMER INCOME

WITH

RIDERBOOKS

NEW! FOR EVERY SERVICEMANREPAIRING TV REMOTE CONTROLS by Leon Cantor& Harry Horeb/Latin. Here's how TV servicemencan successfully meet the challenge of repairingdifferent types of TV remote control systems!This single volume offers servicemen a comprehen-sive repair guide for every popular TV remotecontrol system. Includes detailed descriptions ofeach type's circuit operation, repair methods andalignment techniques. Covers one, two, three andfour button transmitters; power -line, light,vacuum tube and transistor -operated types, andtheir respective remote receivers. Armed with thisbook, professional TV servicemen enn turn "dogs"into simple house calls. #303, 32.50.HOW TO INSTALL is SERVICE INTERCOMMUNICA-TION SYSTEMS by Jack Darr. ". . . covers theentire field of "1 ccccc ern" systems in sufficient de-tail to enable the reader to do installation andmaintenance work on this type of electronic equip-ment." ELECTRONIC SERVICING. :189, $3.60.

HOW TO INSTALL AND SERVICE AUTO RADIOS(2nd edition) by Jack Darr. "Veritable gold minefor the newcomer . . . as well as the experiencedhand." -ELECTRONICS WORLD. The 2nd edition ofthis extremely informative and practical bookbrings auto radio installation and servicing rightup to date. All the new tricks of the trade are tobe found here. The techniques applicable to themost modern auto radios - signal -seeking tuners,hybrid auto radios, transistor auto radios, con-version from 6 to 12 volt operation, are explainedin great detail. #159, $3.25.HOME AIR CONDITIONING-installation & Repairby J. Derma''', F. Makatein, H. Seaman. ". . .

practical and worth -while book on the subject ..."-NAVY NEWS. This modern, completely practicaltext by three experts in the field of home air con-ditioning, enables anyone to understand the organ-ization, operation, installation and repair of allt .es of home air conditioners. 211, $3.50.

The exact or equivalent replacement fornearly every record player mode since 1930

MASTER CARTRIDGE SUBSTITUTION GUIDEBOOKby Jark Strong.

'Indispensable service tool'-TRADE BUILDER.1. Save time in locating the right replacement.2. Save money by cutting down on the number of

cartridges you need to stock. :288, $2.00More than 200 Time -saving lips

USEFUL ELECTRONIC SHOP HINTS edited by thestaff of Electronic Technician Magazine. Crammedfull of practical, helpful and time -saving shophints. A collection of nearly 200 of the best elec-tronic shop hints which have appeared in Elec-tronic Technician Magazine since 1953. Selectionsmade by the magazine's staff, originally resultedfrom reader contributions. #295, $1.95.

New 1962 edition-nearly 75,000 soldTUBE CADDY -TUBE SUBSTITUTION GUIDEBOOK hpli..1. Middleton. (Direct Receiving Tube Substitu-tions Only . . . plus added new feature -1300direct CRT substitutions.) This guidebook willsave you time eliminate carrying needless tubetypes enable you to select the best substitution

minimize sales losses because you don't havethe right tube. #299 ... still only 90c.

e-....Moil to your distributor or order direct.- - nJohn F. Rider Publisher, Inc. 116 W. 14th St., N. Y. 11(a dociSiOn of Hayden Publishing Co.. Inc.)

I hays enclosed $ . Please send hook(s) checked

0 REPAIRING TV REMOTE CONTROLS, $2.50. HOW TO INSTALL & SERVICE INTERCOMMUNICA.

TION SYSTEMS, $3.80. HOW TO INSTALL & SERVICE AUTO RADIOS

(2nd ed $3.25(-1 HOME AIR CONDITIONING, $3.50.

MASTER CARTRIDGE SUBST. GUIDEBOOK, $2.00.[1 USEFUL ELECTRONIC SHOP HINTS, $1.15. TUBE CADDY -TUBE SUBSTITUTION GU I DEBOOK,110c.

Name

Address

City_ Zone State

Satisfaction guaranteed, or I ran returnwithin JO -days of purchase for full refund.



This year the EEM is available inmicrofilm as well as the standardcloth bound edition. The microfilmis designed for use with most micro-film viewers.

The Manufacturers Directory lists6300 electronics manufacturers,their names, addresses, phone num-bers and key personnel, as well asthe addresses and phone numbers oftheir sales offices. The productdirectory lists more than 3000 prod-ucts with their respective manu-facturer's names and addresses. A

COMINGNEXT MONTH

BIG

1963

STEREO SPECIALA YEAR - 'ROUND

REFERENCE ISSUEIncluding

HI -FlManufacturers Directory

Brand Name Directory is also in-cluded which lists more than 6800brand and trade names and theirassociated manufacturers.

TRANSISTORS

Continued from page 32

local stations, with more distantstations sounding good. Unless thiscondition exists, agc is seldom sus-pected as a trouble source.

An extremely strong agc voltagewhich does not change when tuningthrough local station frequencies,may be produced by an i-f stagewhich is oscillating. Bridging a goodcapacitor across "A" line electro-lytics and bypass capacitors in thei-f stages will usually locate thereason for the oscillation.

Other Considerations

If distortion is present on all sta-tions, voltages should be checked inthe audio stages. If all of these volt-ages are near normal, it is possiblethat the transistor gains are notmatched in the push-pull outpti.stage. The variation in gain will of-ten not cause a voltage irregularity,but can produce distortion. But

SWITCNCRAFT AUDIO CONNECTORS

Audio ConnectorsWith ,7? 79

"CAPTIVE

DESIGN"

INSERT SCREWS

From Switchcraft!

Screws remain in inserts when removed for cableinstallcrion. EXCLUSIVE "GROUND TERMINALS"provide complete grounding provisions. Manyother unique features in this 3 -pin line.A3F- 'emale Plug-U.S.A. List-$2.25A3M-Male Plug-U.S.A. List-$1.90B3M-Male Single Hole Mount

Receptacle-U.S.A. List-$2.90C3M-Male Panel Mount

Receptable-U.S.A. List-$1.40

See Your Dealer Today or Write Usfor Dealer Nearest You

SillINVOLWOOrl5583 N. ELSTON AVE. CHICAGO, ILL.

. ;or more details circle 40 on page 46

1-YR.GUARANTEED RADIO & TV TUBES

00.0,,1,(11;USED TV'S

cotl Y.Witt!cows!. !pod tubAs

liggrandTuatrnent.

isIttD or

Diet for resal:41 orets

Y"' ow" "non'smaller%S. --binned

701.."ItZWn.N.J. as

SPICIALI TVConsoles Sirs

10". 12", 14"while *sly last

Partial Listing Only ... Thousands Mire Tubes Is Steak!SPECIAL! oCBs 30< ICQIOY 304 6407 OATS &COG 4.17 614607 789OU 354 6484 GALS 4007 1514601. 6W4GT394 SAO! 5A041117 41C17111 507 61.446437

48Q74 6104407 SAUSOT *CMS1A71271830711450TILI1151050?1 IS1151741041US192IX2248125042015

W PRICEsa

Per/ 00 TUBES

Factory Used or Factory Second Tubes! TRU-VA( will rplo: FREE any FREE BONUS! Plastleuni i oitignneostti.be that becnses defective in use within 1 year from date of purchase! 7001 11154 rgalafALL TUBES INDIVIDUALLY BOXED! CODE DATED L BRANDED "TRUVAC" "if.) with ""7 fliff7of SO.00 or more.

2 0t2846 129507

707 213317 12W11 127707 2804 12X607 6141 7147 28E1 1447/121117SW 6X30T 7Q7 25811 14164527 GARS 11A95417 *CMS 534 11X5 717 2807 14Q7

4C5111 6ALS *AVG 6C147 5117 63110 706 2111L6SAMS Saran SAWS GCN7 GS SOT 7AS 7X7 2897 1704SANS SANS 64X.4117 6347 71111 731 2806 19AU137SATS 6405 611)15127 SCR{ SIC? 747 70.1 2037 15A911 6406 6805 SCSI 510707 745. 12AS 2CAS 18.15SAZ4 6407 6807 SCSI 5585 784 12.485 2CNS lOTSSIRS GARS 61317137 OCUS 6187 785 12A1241 204 24A3C011 Gaul 68611 5005 5607 75 124811 285 25211.07546 689 6B0607 604 SON/ 71117 124QS 2841 27594 6644 6007 4DEf GfJ7 784 12/1711 2145 35ASSTU 6BC5 6006 *0060? 5507 7C4 12AY7 2117 359S 4351114 ABCS 6855 61385 511" 7CS 12AU 21.6 35C5 SOASSU 6806 683 50 6E5 11.5N TOT 7C 13AU7 2Q7 35W4 SOBS3415 5940 69E6 6806 SFS 6507 707 I2AV5 2RS 3525 SOCS3AUG 59507 6085 6807 11.F6 SSII7 715 12497 2147 36 SOLO31105 1118 58060 604 6146 5T4 715 1241407 21.17 35 553065 5Y3 GANA OCAS 534 ITS 744/XXL 124X7 21147 31/44 0031125 IAA IWO 535 5E15 717 12427 211/17117 41 114/117.420I5 SARA SASS 11C01111 GAB SW 787 1204 21417 42 117211 -YEAR GUARANTEED TV PICTURE TUBES. Mesa tubes are made aely free maw partsand materials, except ter the envelope vrilleh Is mused. Below Listed pekes do notInclude dud Add Additional 55.00 Deposit on tube sizes to 20'; on 21' and 24' tuber -57.50.Den refunded when dud is returned prepaid. Aiumillsorl tube -1114.00 extra. Picture tubes',hipped only to continental USA and Canada-F.O.B.. Harrison, N.J.

Sensational Otter!"Self Service"

TUBE CHECKERS

$3795 FOR 00

Illorthouie

m rmo ""rr::rtnsoel, own tubea_._.3;v115511. .111.eake 731" semment Inreturn T." ten. with'the w*1), War,

istd console de

CFOINFOLOTTIora DOOR __AND

NEON -1.10447113HEALD

10B04 105 HOPS 11195 1398412184 995 14874 995 17C8414904 10 95 141.84 10 95 17084PIAP4 1195 142224 995 2090411113P4 1095 17AVP4 1595 21AP4

1095 214L04 2395 21117405 11A14.174 2295 21774 1795

1905 21AUP4 2395 224184 27351795 21AVP4 2395 217P4 241152795 21AWP4 23 05 xivrr. 2095

DIPS 2195MPS 23 N24484 39 if34004 7195341384 20

ATTENTION QUANTITY USERS! Big Discounts Are Yours . Call or Write For Our10041 Tube "Private Label" Special) Attention Branding Dept. MGR.Money Cheerfully Refunded Winoin Five ISS Days, If not ComeletelY Satisfied!TRU-VAC IR) PASS YOUR -On orders of 55 or more in USA and Territories.Send approximate postage on Canadian and foreign orders. Any order less than 55 In-quires 25qt handling charge. Send 35'" on C 0.11.'0. All orders subject to prior sal*.Complying with Federal regulations, the following atatement appears In all TruVaCadvertising: Tubes in this ad may be FACTORY SECONDS or USED tubes and are clearlymarked.

Dept. ET -8

Harrison Avenue Box 107 Harrison. N J HUmboldt 4.9770

AUGUST 1962. for more details circle 41 on page 46

65

don't forget that a speaker can alsocause distortion!

To sum it up, most defects intransistor circuits will cause faultyvoltages in the defective stages. Afew exceptions have been noted, in-cluding transformers and mismatch

_of PNP transistor, and alignment,but the voltage readings remain oneof the most revealing criteria shoot-ing transistor circuits. The excep-tions should not be considered untilvolages are carefully measured inall suspected areas.

TOUGH DOGContinued from page 40

other call for the same trouble andthe same three tubes were burnedout. This time the set was broughtinto the shop and a point by pointcheck was begun. For over twohours no abnormality was found.Then, while the ohmmeter was con-nected from the 12L6 heater toground, the meter showed zero forjust a moment. Making sure theleads couldn't have come loose wetried jarring different areas of thechassis. Finally we came to thetuner. Every time it was jarred at

PROFESSIONAL

technicians

use

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ORDER BOOKS

for every

TV -RADIO

service

call

OFFICIAL ORDER BOOK

This is the busi-nesslike approachto service recordkeeping. Tripli-cate forms serveas order form,invoice and officerecord, withspaces for com-plete informationon every job.Separate listingsfor receivingtubes, pix tube,parts, serial num-bers, labor andtax charges, sig-natures, etc. 75ca book, $6.50 fordust -proof box of10. In stock atyour distributor.Write for yourfree folder de-scribing DaveRice's OFFICIALORDER BOOKS,including an ac-tual size samplecopy of the handyorder form. For customer'sprices on everyreplacement part,plus flat rate andhourly servicecharge data,regional andnational, DaveRice's OFFICIALPRICING DIGEST,listing over 63,000items. $2.50.

ELECTRONICPUBLISHING CO., INC.

;' ;133 N. JEFFERSON ST.

HI CHICAGO 6. ILLINOIS

a certain point, a dead short fromthe 12L6 to ground appeared. Thecover plates and small shield platewere removed from the tuner. Alongside a feed -through capacitor "out"lead was a gob of solder, barelyholding on to the capacitor/wirejunction to the 5J6 tube socket.This "blob" had been there sincethe set was manufactured 7 or 8years before. Once more a set ofthree tubes was installed, the chassiswas given a check for correct afc.adjustment, sound adjustment, etc.We had no hesitation in jarring theset with the new tubes in place feel-ing fully convinced that we hadfound the trouble.-M. G. Goldbert,St. Paul, Minn.

TEST INSTRUMENTSContinued from page 43

ture tubes. The TT -1A checks allof these with a simple and neatmodification to the model TT -1 test-er.

The six additional sockets aremounted on a matching panel andinstalled in the tester's lid. Theadapter's electrical connections aremade with two short cables whichplug into sockets on the basic test-er. Four switches for the adapterare also mounted on the adapterpanel. Two blank holes have beenleft in the panel for future modifica-tions. Chrome plug buttons are in-stalled in the holes.

Good circuit design has been em-ployed throughout the instrument.A 5000 cps voltage is applied tothe grid for dynamic tests in orderto approach actual equipment op-erating conditions. In an attempt tokeep the tester's roll chart at mini-mum length, infrequently used tubesare listed in a separate booklet. Inthis manner, tubes which are testedmore often can be found quickly.

ADVERTISERS INDEX

Aerovox Corporation 52

Aero Gap 9

Arco Electronics, Inc. 12

Armco Steel Corporation 41

Atlas Sound Division 60

ATR Electronics, Inc. ...... 62

B & K Manufacturing Company 57

B i K Manufacturing Company 53

Bussmann Mfg. Division 13

Centralab, Div. of Globe -Union, Inc_. 63

Channel Master Corporation 60

Cornell-Dubilier Electronics 20

Delco Radio Division 17

E. F. Johnson Company 18

EICO Electrical Instrument Co., Inc. 8

Electro-Voice, Inc. 64

Electronic Publishing Co., Inc. 66

Fisher Radio Corporation 58

General Electric Company,Electronic Components Div. 10 & 11

General Electric Company,Electronic Components Div. 54

General Electric Company,Electronic 'Components Div. 55

JBL International 58

Jerrold Electronics 3

Lafayette Radio Electronics Corp. 61

L. A. Tuner Exchange 66

P. R. Mallory & Company, Inc. 2nd Cover

Quam-Nichols Company 19

RCA Electronic Tube Div 4th Cover

RCA Electronic Tube Div. 51

John F. Rider Publisher 64

Sarkes Tarzian, Tuner Service Div 4

Sencore 18

Sonotone Corporation 6

Sony Corporation of America S9

Sprague Products Company 7

Switchcraft, Inc 63

Sylvania Electric Products 48 & 49

Tru-Vac 65

Tung -Sol Electric Inc. 3rd Cover

Weller Electric Corporation 56

Winegard Company 47

REBUILT ORTV TUNERS EXCHANGED

ALL TYPES

$9.95including parts and labor(broken parts at our cost)

Normally shipped same day received90 day full guaranteeU/V combinations $17.95

FREE-II Mailing corton sent to you on request

Phone REpublic 3-9189

L. A. TUNER EXCHANGE 4611 West Jefferson Blvd.Los Angeles 16, California


66



ANATOMY CLASS FOR DOCTORS OF RADIO AND TV SERVICE

NEW AUDIO AMPLIFIER TUBE SUPPLIESFULL -RANGE TONE FIDELITY IN RECEIVERS

NEWEST addition to Tung-Sol's family of fine audioamplifier tubes is the type 4GZ5 pentode. Thorough

exposure to realistic combinations of operating and en-vironmental hazards during development shows this tubewill lead its class in television, radio and high-fide!ityservice. Even after accelerated life testing, the subjectremains full of pep, providing large power output withremarkably low distortion over the full audio range from

loud cry to subdued chortle.Tung -Sol takes lavish parental care of this baby during

its formative stages. Internal elements are welded andbrazed on hospital -clean production lines after steriliza-tion in bakeout ovens to prevent gas, leakage and spuri-ous emission. Rigidized construction cures low -frequency

rattles and other forms of tube distress. Alclad platesspread body heat evenly for efficient cooling.

FORMULA FOR GOODWILLCustomers will love the way this model tube makes stereo, radioand tv audio come alive. roster good customer relations byadopting the 4GZ5 as your first choice in replacement tubes.Others in Tung-Sol's family of audio amplifiers are: 6CU5,6BQ5, 12CU5, 6AQ5A, 6CKo.

TUNGSOLAUDIO AMPLIFIER TUBES

TUNG-SOL ELECTRIC INC., NEWARK 4, N. J.


This many picture tubes from one box?

Because RCA Universal Silverama

78 Universal Silveramas replaceEvery time you deliver an RCA Universal SikeramaPicture Tube carton, you deliver the equivalent ofmany replacements-not just one!

RCA-pioneer of the Universal Picture Tube concept-has converted its entire Silverama Picture Tube lineinto Universal types. And made life a lot easier andmore profitable for you, the electronic distributor.

With the Universal Silverama line -78 types takecare of just about any replacement call that comes up.One Universal alone-the RCA-21CBP4A-replaces 19industry types.

Every RCA Universal Silverama Picture Tube is madewith or all -new electron gun, the finest parts and ma-terials, and a gloss envelope which, prior to reuse,

has been thoroughly inspected, cleaned, and rescreened.

YES!Picture Tubes Make Possible Multiple Replacements

virtually every type on the marketThink what this means. It means you can keep a

complete picture -tube inventory in less space, with farless capital investment, than before.

It means tremendous simplifications in inventory,record -keeping, and reordering.

It means faster, better service to your customers ...with no more missed sales because you don't have acertain type in stock.

This handy slide -guide lists all 78 RCA UniversalSilverama types, and the 291 industry types they re-place. Order a good supply of these convenient guidestoday. Your customers will be asking for them.

RCA ELECTRON TUBE DIVISION, HARRISON, N. J.

The Most Trusted Name in Television

SHenuirui1.1.11

AAAAA CISIONTPICTUI 1111111

ELECTRONIC TECHNICIAN...35791 TO ELECTRONIC TECHNICIAN, 1 EAST FIRST STREET, DULUTH 2, MINNESOTA....

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Transcript of ELECTRONIC TECHNICIAN...35791 TO ELECTRONIC TECHNICIAN, 1 EAST FIRST STREET, DULUTH 2, MINNESOTA....