LATION PUBLICATION t;t · noriz dsc grip 0 30v p -p 510riz rate wc,... vi)lj me srn 1il im imo t,...
60
FEBRUARY 1971 'OA HARCOURT BRACE JOVANOVICH PUBLICATION ELgCTRONIC TECHNICIAN/DEALER WC ARGEST TV -RADIO SERVICE & SALES CIR LATION t;t
Transcript of LATION PUBLICATION t;t · noriz dsc grip 0 30v p -p 510riz rate wc,... vi)lj me srn 1il im imo t,...
FE
BR
UA
RY
1971 'OA
HA
RC
OU
RT
BR
AC
E JO
VA
NO
VIC
HP
UB
LICA
TIO
N
ELgC
TR
ON
ICT
EC
HN
ICIA
N/D
EA
LER
WC
AR
GE
ST
TV
-RA
DIO
SE
RV
ICE
& S
ALE
S C
IRLA
TIO
Nt;t
FROM THE COMPANY WHO GIVES YOUTHE STRONGEST GUARANTEE IN THE BUSINESS
BUYAN INSTRUMENT.GETAN INSTRUMENT FREE*
SIGNAL TRACER PROBE
<-<s-imme
Gain 3000 at 2 KHz. Bandwidth 50 Hz to200 MHz. Z 3500`' to 350 K!2. Output 0.3 p -pvolts. Noise -45db. Supplied with anti -overloadprobe tips: Eico PST -2, Kit $19.95,Wired $29.95.
4: TRANSISTOR ANALYZER
Tests trans -conductance andBeta in and outof circuit.Measures FETs,bipolars, diodes,rectifiers, SCRs,UJT5. Built-involtmeter, ohm-meter. 50µa tautband metermovement.Eico 685,Kit $99.95.Wired $149.95.
I: CURVETRACER
g4
o
New professional transistor/diode curvetracer enables any general-purpose oscillo-scope to display direct readouts of the mostmeaningful data. Eico 443, Kit $99.95,Wired $149.95.
SOLID STATE COLOR GENERATOR
Standard offset carrier type stable 10 -bardisplay plus precision dots, crosshatch,individual series of V & H lines; gun killers.Feeds to ant. terminals. Portable, battery/AC.Eico 385, Kit $69.95, Wired $99.95.
*FREE EICO TRUVOHM'" MULTIMETERS(with purchases as described)
Model 1A11 K ti/V
Model 4A34 K C/V
OSCILLOSCOPE/ VECTORSCOPE CD SOLID STATE FET-TVM's
CRT TESTER AND
DC -8M Hz(usable to 10MHz). 5" flat -face CRT.Sensitivity 12MV RMS CM.Negligiblerelative H & Vphase shift.Excellent curvetracer withEico 443 (below).Eico 465.Kit $179.95.Wired $249.95.
REJUVENATOR
For all B -W &Color PictureTubes. Each gunof Color Tubemeasured indi-vidually andnumerically,provides
U - required grayscale trackinginformation.Eico 633,Kit $79.95,Wired $109.95.
eSOLID STATE SINE/SQUAREWAVE GENERATOR
Providessimultaneoussine and squarewave outputs.Covers 20 Hz-2MHz, 5 bands.Max. distortion0.25%. Rise timeat 20 KHz 0.1µsec. Eico 379,Kit $69.95,Wired $99.95.
AC RMS; DCV:0-1, 3, 10, 30,100, 300, 1000V.P -P ACV: 0-2.8,8.5, 28. 85.280, 850,2800V. DCInput Z 11 MI?.Ohmmeter 0.2`1to 1000 M9.4'/2" 200 NAmeter. Eico 240Kit $59.95, Wired$79.95. With 61/2"meter & AC/DCCurrent readings.
Eico 242 FET-TVOM, Kit $69.95, Wired $94.50.
TUBE TESTER
Tests all standard tubes plus decals, magno-vals, 7 -pin nuvistors, popular TV picture tubes.Professional, compact, lightweight, and modestprice. Eico 635, Kit $44.95, Wired $69.95.
CSOLID STATE SIGNAL TRACER
Output 400mw.Inputs: lmv RF;63 my AF:Hum >60 dbbelow 400 my.200 ca meter.Provides sub-stitution outputXfmr & spkr.Eico 150,Kit $59.95,Wired $79.95.
THE TECHNICIAN'S CAUSEEICO helps it. With ...
1. The first and only instruments with the MOST capability -per -dollar.They do more, faster - save you more time, effort, money.
2. The first and only solid state instruments guaranteed for 5 years.3. Now, in the teeth of inflation, EICO makes your dollars buy even
more TOTAL VALUE than ever before.OUR 25th YEAR. LABORATORY PRECISION AT LOWEST COST.
After purchasing any instrument on this pagefrom your local EICO Distributor, mail EICOthe sales slip, Registration Card and coupon atright. We'll ship you prepaid an EICO TruvohmMultimeter as follows: For each purchase upto $100, the Model 1A1; for each purchase over$100, the Model 4A3. Offer expires Jan. 31,1971. Void where prohibited or taxed.For latest catalog on EICO Test Instruments,Stereo, EICOCRAFT Projects, EnvironmentalLighting, and name of nearest EICO Distributor,check Reader Service Card or use coupon.
ETD -12
Name
Address
City
Offer expires March 31, 1971.
State Zip
EICOEICO 283 Malta Street Brooklyn, N.Y. 11207
. . for more details circle 108 on Reader Service Card
ELECTRONICTECHNICIAN/DEALER
2J-CILZTL/51COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
SCHEMATIC NO. SCHEMATIC NO.
MAGNAVOX 1341 RCA SALES CORPORATION 1342Color TV Chassis T936 Color TV Chassis CTC49 Series
MAGNAVOX 1344 SYLVANIA 1343TV Chassis T941 Series Color TV Chassis D12-20, 21
RCA SALES CORPORATION 1340TV Chassis 179 Series
TUNER SCHEMATIC
40 MONT
:2D54 5KE8 51S,E81I... NosLa0.1 1
54REAR
?N
44
TO NW
'I
710o.
11 PIrI
NATO.. MINIT
1.9 V
s
LAN
112
53MOTT
53REAR
4,4
m 44
IA
TO300"
ANT
ALL AA SISTANCI MOTS 110(00 10:10ALL NISISTONS ML Near, MOO a 0INCAT0ALL CAONOITANC/ AK IN PT 140/ EXCEPTAS 500A1011NOOK 0 0111 IN ...W EL 0 POW..
011110TE1 ONION. OINNECTION Of KKR SLAM
- K110111 CONTACT CONNECTED TO CONTACT LON 01.11011111 VON 01,11171TON
(1(01(1 <OAT (110111 101401,00 0000171 WOO M SITITM 1.
0,10
LT
e-ANOCOONLINAADAJOI
SLAO No
LAI
uoMLOW SAIDWILKINSADAM 32
FRONT
°0
110 COOSKIWNS
EC. em
Ca
TN
TWANG SANS
To
Ra
WION
ANT
TOCIO 9.
TIME*.ROL
OS PIN 2
',COPT GRID+TITI(A, a4., SO'
V203A PIN 2 0AGC GRIDHORIZONTAL RATE NOV P -P
"TIP ril!
TP.3
SECOND DETECTOR 0VERTICAL RATE 2V P.9
r .36SOUND IF1/2 601 -IPA -
4v111c2,4
gi2 hiC
Ise =
121/111
0204
I =
c..
r 72o.8212.2200
W01A 12
I -
I ova, .z4259
0231621IEG
a
C20E6e RC2171/ C22
6
C245 20322
0FIX IF
L2021
T2D4 4EH7
0240
I f.
,013404
mu
." 2.-*cm T 330 P.V 9
TP-1 GI,
T21,12
5230214
3 4:101/211L08
3-9'
11224 L C346 JUNCTION C..)(ZONE 4A avezao BOARDVERTICAL RATE 110V P -P
V2068 PIN 9VERTICAL OSCILLATOR GRID
VERTICAL RATE 180V P.P
V205A PIN 3 eAOC PLATE
HORIZONTAL RATE 420V P P
12031 PIN 9 ri)VIDEO AMPLIFIER PLATE V--/
HORIZONTAL RATE 110V PP
1706A PIN 2 (;)VERTICAL OUTPUT GRID ',L.'VERTICAL RATE 211 P
1907-7NORIZ DSc GRIP 0
30V P -P 510RIZ RATE
wc, .. .
vI)L J ME
SRNIL Im IMO1t,
0202!AUDIO OUTPU
V2 OVA)R2o7470k
V26G1-13A TifSYNC
,01V
MAO
GNp 1%I OtV:8JDS A
20
---
tow 2200
I SIN
e 7104
1450
V2031 PIN 9VIDEO AMPLIFIER PLATT 0VERTICAL RATE 110V PP
1340RCA SALES
CORP.TV Chassis 179 Series
V2016 /IN I 0SYNC PLATEVERTICAL RATE 60V PP
rri
FEBRUARY 1971
511201 CATHODE JUNCTION 0HORIZONTAL PHASE DETECTOR
HORIZONTAL RATE 13V 11-11
LCCNTRAST'"4 71
444254.44
-1 3 ILL 2E3"
UC7339M, ;In.:203 170111 poi (40.33T4
I- Ner. utrIc
efl"airo. VIDEO Vi'li T
n'
I/211(01
f 11110(1
S O
0244JA
301.
Tc3v;7290
tGroam VERTU
°F 14,1o
0267586:
6268310 (2521
120 =
V.
50202
C2533300
RITO600
C25A056
4212ISN
LPW200 1-CRI2 HOLD
a
006
(21.22N
244
LIN
-414
RE
-L
VENTgz
'c
VERTHOLD
310--1751.
o-LI WIG N.-
. .g/SA
Watt
1
0021042K
1:4 11.; t';
S i2 C101SAE
IC
V2011 PIN I 0SYNC PLATEHORIZONTAL RATE 60V P4.
511201 ANODEHORIZONTAL PHASE OR
HORIZONTAL RATE 15V PP
NOTES11=10002.0 L 6EZoSToCE WOES coos3 AIL CAPACITAKE VALUES LESS T14401l0
ARE IN UFA° 30 111044 34.E N ULWAU PT AS DOCKED
4. ALL RESISTORS ARE 6.26.67.2400.6AS .643.c4TC0
S 4.44:6c4TIEs 524
EI
19041000BRIGHT
sonKivi SCOPE
2 3'4 HEWN
yy4.:n23371, =
`01406
511 -I
CII2 Ovid
IE A
Ire;VENT
T6745
0254000 !iF
/OW1016 .109
560
010
11
VIA A
VENT OUTPUT IT01.454
7.-431/2 ZIL F.13 ILI
I
I N.,.WOO
Vveshm7
4711.3_COO a=501.11O 50
us. CN390
12754
C120100
CR 02 CRIO4
Cli OE CR105
,cx
T 9411) 004I1V1C1 =
NOI f (110 I
OUTPUT390
-9-90-22JR6L100RIO2
.
MO.(
17006 ""T2.iso
.VVOTI-1
"
P
MID
o0w
NOV
V 2m,IER
170154702r3r...A.
04M
12121ig,3[
4102
Coatimoo2200
COO
0211
DOOS, ape
r
1.1.2d 142543A
4
25.x000006.0..1'.1W.
LOVIDS1000
WO
.11
* a±--caa7SV
rI-Wot. 1WED
WSTANT
ND
20 120
TO 9W200-.0
TO 0105-3
002NV RECT183GT/IG3CT
01430
CLOT 4 0C4.6OSE634
WI
1204
YOKE
:45t 0(07" "17
311.0.9 WOE
P W 20015
LENNE.000
02591000 r
AIL UT -1 011l =I11
V2052D54 SK 5T11 :Z 1201
o ,,,j,,,_L. F70 11T ITMT5. c00
KM MN EMI -I
I.' 427e312 I '
NO TIM NMI
COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET, DULUTH. MINNESOTA 55802
1341MAGNAVOXColor TV ChassisT936
260I 1
.31/11/11 PI
® 0
ELECTRONIC1L7=5TECHNICIAN/DEALER 7.11FEBRUARY 1971COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
L120 rn
0 (I
NEE-4V-cf.V.Te
CI.0014 3
0:0-1TO 521
LT0 9/50.
300 FM
0,10 5V Pry
0 0 0 0 C) 11 n ® 0 0 ®
11111 11111111 111111
l
2511
11111Pr
IV . 5v XX:3611-10 I
® 8 0-4)
-07I L uw rn
I I
2e. "M1
750v P/11
AUDIO MODULE703327.1 OR ALT 1512003.1
2000
TO 10.11DECOUPLE01
04v SUPPLY,
0417141
2 OV
TO JCT. OFOHIO .
ORITPI
S. TO UHFTUNER VHF TUPIER
TEND VIEW3401321
103NMI Cum,10.0
5
MALE 0101
OC
ISOMI.OstscosL __J1 0.
010191.A 1250
OTERLOOT
1936-13,I4,15,16
LIW
111101.[Ilcr
0521
54017A
RE
nT
MHOS TUKVUO
4.06
rt ST WITwM
NOTES comas c.o.s. 30(0000.coar000n Loon. O. 00010.
I. C.ACITAKE NAL0TE5 % 1 OP 110. AM IN INCOTARADS..CAPACITANCE .0.1E5 LESS TIT. ARC ATCROTARADS
. SOURCE vOLTAGES 0020..K0 101.0 30.AL. ALL OTHERS 10ESUREO MTHNO NODAL *KEPT THOSE CANT0IE0 ITN KT I.1.
3.01.1.0 KAM. PETER TO *ORTON..4.100NEF00110 00..0 USDA 00 KM COLO. 00.11/3011,CONTRAST 11.0.100
CLOCIONSE A100 ENWNTNESS KT TO PROM. 1500 111 RATE OF 00TIP0 1.COLOR 0001003. SOT TO 010000.1 40 HP 0 KU % OK AM TINTCONTROL A00S1E0 TO MON. NOOK. C4000 W 0504.01.0 510NADENTA1
7 PARTS MAY K CONNECTED IN EITHER DIRECTION ON SHORTED 03REOURED FON 0045I2 CENTERING.
Dr> C0 USED WITH .010 NODULE 703327-100 612003-I 0015.1
9 AUNDERSIDE K PC 90A0D !COPPED S1011
031
UHF e
34V DCTP
00000C40A
29010010001
VATmE0910
TANSSANS
VHFTUNER
APT .0CI 00
Asa 1, C404T. 490/0CAS mseA 0I OTINFT
TO
V TO 31VOCTP.?ova:
-30v PuLK
SIT
[.v. ANT
002vERT 1001.0K
OUTPUT REACT CONT.1004 44011.
5 5
smutSRKOOI
1501 PM
0 0
00 goo.0.1
PIP 300 .n
15 Ci)
@ 0 ®® CD 0 64) 0 6-1) ® ® ® ®
35v P/P 01035VP/P
03*000
11 '/FT
020
IrC01 0.
act,1
20
`"0.3
LE0.10*. 0
c7g0
rtTct., I"1
RE AOCTO TULSA
V104OUTPUT
TOTS 222r11111""
5
310t Tn0FtQUICK
PICTURE li;;;
""RED -0 itK" 70,1250
S00C
I 10 ANC
L, AK
MK 054
R5502
*504
conISINS1
APT OET IIP
ASO2.20
21
1G 051
4.5 50 0(
L-T=
I VA
TP0
01005%
TPD
011001114.SOC
401.0 IF
2,4v001 0341 ION
CO}20
1014 SO
-C1
r -1
fxCC!!
OEto 100.
' no or ,,,,,,c:A 2 2,
4-.jrTCL_Ir.,
4 0 vI
*oT C217 L
L5.2200
ST i , cus ?A ii2.or ..
.10C,220%
AN
I
to%
CO.fovR52)01
.2.90.25 NTA.1
21
031IN 31
1 i sil.ssgC45
5411002 5 v
1,,lv
...
03 100
--3.11;X
4Tv
r'711:. SC4 2.0v
020 2
L
T
aor05
SCIT
Cig 1 % 4.1I
NOI MO
..1:20....ex7
00
2200201.
TO DrTM 01
40K 01113V
Gr.
053 -051 5m.
RID MG 0
C101
501500
AOC A0+
MT
:dor
5110Rt. 0059 TOO
-1 '3°'00?v.
1500
1.02
TO KITT OUTPUT
001000050
04 I.010.
3500
1111Os MC AIAP
,Iss
011001110
20
.32421:"3.2v
Ce?30.0
0V
21.0 MACE
0 TO .1.0
007090
F
DG;
01."150"
7771++
1,70.06DIq* 7511
cps 1501
L4i5."."
01043.011
100955005%
Cm330
MOT
.7.o.sos COT
U.
.21
Sit" ®sus Twos*
002500
A4100
1.05
220
.2VIOL
GN Mil I. 90100
60 REACTANCE J1-'40000owro CONTIM.
771
1MT
4
.02COLO. CONTROL
C10
5411
JILED 753
101.1.10
ISO
4001 SOAK
111.
A
B
D
E
H
.99
Ito
1.131IMAM OIC
1120K
s 2050
CI)
2000
KWIEFREO.COAT
0
O 00
M
COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
B
110v PIP
AIA
t\TV V \aTt
01/4
!Npi Atal\fe
2117 rnI I
10717
0..0 ®® 00.... ®®
PPW;JoiT7.oriagr051.0
E.19 112-1188 > + 111010 111P WO
L
015
."17,0 TI1609,os
nue (1)oci.moso.L,0111911 11.1, Tc°
TO Al
+no.Hwlx11.11-
110. Pn
r MOW6,4.1
2.00
IN
.01
CNO 00
III'2200
PO
1212
NOS iRMOTO.
4.147 TI
VINO Ott.TP2
014 179 0111ST000. SWINT
71410
VHF TUNER SCHEMATIC
INPUT
0
H-6b1 -2-4-154-%1F"
2I "LIM270 4 .2
C102 Tili!
E CII
C3 4to
MAGNAVOXColor TV ChassisT936
_300.41.1w4F.
1.111
CI20
01:SES02002: MPS -H2003:6APS412004'0E3002
031000.11.
IN
37:8 2111
1.2
C10-4*110 0WV AGC
02
"T"seCIS
11.*N541110
CIS
17120
03
1KIS
CM IK
e2480T""CIS C22
1411391-1110 0
OUTPUT
ReISI
III
2 7K
I - I, 2411101 j1000 "Msw
131Z -
007111016TKOWOW
OUTPUTISO,
9.J toRas 41010,1r
CIO
12/0 NOSNWT /0 WI 111Ir
I4010
I.1.0 TOT 66.Loomono
401TO r.N.CW6
A11°:721711(0 NT
NW. CM. 61 3.7301
10.
.0.6608
13WIMT 104 .7P
cm/MOO TO
* 10
IN4510.
7411134O 00 4::.
Slv
NCO
MN TO
11026M., Pow CO.
.R7 tovanTx64.
.141.
2100
02.2. 4115
"Ad
0002-C122..047
1117/122 906
9..0.1`3,20.1roo.
JO
CM/
T71?
WM3CUSA
WRICT
6611 33
I
WMIMONOM
OUT.
RI
j.c0 1100MOM.041WNOrM
It3004
1.1043.111160
ILS._6wf
1000307
JS600r
SOWN TOINIM TLw
OCPLECTION Tat
HMI 0301.2
WOSt301,0-1-
4700
WO 4702.910 23.MO NOW
2.0
WO,
10 _
0061MOO
16810 OK6 xsch,
-S.Sv 09v
losT:
I ---
pp 70 410 260r 041was .
307
02- -
00111OMNI
11-101M0
CON
Tv(
INV60TNT TILT
cut
VOL
jo512
NWTti T
10-1110
OA- ON
6101-11E0
OW -0w
II
2204
L _
10:6Com nu
16
WANOWNUM
IS
TEL- 12
J
3.101
IOW Po.660...
305 NU.SIE
-0NN .1.611
O 210
O 07 RAW IT TILT I
31104
0JIM 4111 Ai 0P207 110
111 WIT TILT
uqMONT SW
RAOW Or
LIPS8104? IMN
WIT kW
C
PO!,,o10
I.' 1; LIc't
MI:
TO 01=-1:'
L.', 0L T".2.!-_* -
8102 802
-Li sLi
01,11I -F r7 :17 RO
!rajT". -
L.:
11214
L..1:0, 1 0101
PA DIN 1011
1211070 100
4111
CIT)
1170310
41
KRIS 1
at
1f!}
1171470
TO 260v
02006000.
IM oeMO
/11
OD DIM
ORN 01191
11/026000
0117350
0614'
447
KU2011/1
.0 2107011
ON
1;'
100
Pir17
SIM0152.1.50090
3007
IMO071
C'cr 76
NOMMON
11-7016M
2101
1%311.0
.T.r -z1,14
LjLowom...ftsj
1211 C174,70 .15
004.CniOl
iglf4
L'40.""nu404
1601, RISK
61/4;,,trOr5
I 111
/500
Lilt0200.
o af3306
SCOT
,1KV
TO ..NMMO
01712711
IW
2110YAO
1162100
:4!
111(4
604111-71111
060
PIN.600
.1634100
1 I051104T
4700
0 '6°3ZOO
MISmoTool
I
YIN
R12220
3
PT'
IISU
900
1SG101 0
N206
USEDON
0334-11,12
'1670
wiRcereC
3 0 1
471211 CRf
11,11.01-.
"
WO
STO 016
P 101
? 7 971700
PIN Slot -P
037
3 I Pt +111-4
0 0 04 S
7 7 70 0 0NW 4 "II SIOUP
444a
1101 +11M-4.1.02
30041205
KuSCR.
.065000wv
7
O 204 IG
066SCR. -
11ppyy6
000
MI6
50 4607 PT11,
105
0505 175
RIN
50 NOY PT4063
.0000my
5501,c33
67:47.C310013TENIONOLS
COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
3.1
Cl)
11P22OR
MOWNMIMUM011(
1342RCA SALES
CORPColor TV Chassis
CTC49 Series
3.5V P -PVERT RATE T
. 4)
II
L
2 5v P -pIORIZ RATERED DRIVE
INPUT
10
26
ELECTRONICTECHNICIAN/DEALER "U'ALWG,CP"FEBRUARY 1971COMPLETE MANUFACTURERS CIRCUITAND TECHNICAL INFORMATION FOR 5
-
60V P -PVERT RATE Al
27
V P -pHORIZ RATE
GRN DRIVEINPUT
10C
T $ .9.01
Sic303003
0
0.03
$$
$ I
No10/1/44111111
60v P -PVERT RATE B2
3.01000
95621PITPUT
Fs,OPP
To 4100- T00.0. C *TO 0440.4 ,r470- ?OM
la- 01 0,-1 .. nal
0.41/010. tc COP
DIAGRAMSNEW SETS
cp,
2 8 V P- pHORIZ RATEBLUE DRIVEINPUT
0
nowillp.
2960V P -P
vERT. RATE El
OOI.O9tELSSCP
6V P -PVERT RATEAIR SIGVO
0190v F -P
HORIZ RATERED DRIVE
OUTPUT
0
ce I--jv
COI70.
r-i.:1.1
cu
0""NN C 102411.v
cp
rU 1.120
1113.1.3
3130
aav sta a r0901
*
:AS3539
3.0. Jv
04PI 0
330004
3v
0104 I1*.02?
Ir( PM 200)
IMP ,11,
10.0304 2300 PO
av
_1=1.V.Mpr
N
CIS cIP CO Cli ... 0153..000 T moo 0 i ;coo / : vvoi_ KIP C34
P.? s it.Mv 23.4 9p ,_
ICil1110-4 M ? -MM M -4 .1I1 -OW -ear- -. I-- - IA 31 - -I0 i 5 KA a 1:&4 -
I I 4M I 00 ; WM I- ICN. I 0 9 100 0 =1
I PIX IF o;T...
402ttNII %MI_
P3232
3
IA. IC 2
'79?
C2:9 I 0102">---4-0. 3601
74m II CI 2
40OV Nk
SOUND
30V -A
PW 300
10301022
C0 3 t43
13.0
- I.17
Igag
ToWv.vv:1
O60 VPPVERTICAL RATE
BRIGHTNESS
144 104 -
Os
SS.
".' C0%3
'3'01
SO
35 V P -PHORIZ RATE
100 v P -PHORIZ RATEGRN DRIVEOUTPUT
14
)..1.14%.10 P0000.50 [-SO
:01', I
PAS113. 4700OPP. 0
411114111HP
.1
,44p4111No.4'Nil I'll
\ 4 VPPV21 VERTICAL RATE
COL 04 4 OW
I
.10
IV P -PVERT RATEAIR 510CO
0200V P -PHORIZ RATEBLUE DRIVEOUTPUT
15
it~itliftfl#
10v P -PHORIZ. RATE G 16
55 VPP0 VERTICAL RATE
I P -PHORIZ RATE
0MIMI "IMP= "ma
10,4,a444.0.0.
0 300V P -PHORIZ. RATE TP-I
mr:-,;) 250 VPP
HORIZONTAL RATE
3.55 P -PNEAT RATEAIR S:GCx
O
re ea,
2.
0--4
?
:300
16
,c0 w
0
a 0" .34
-&0!r<
VOWS F304
IMO2,1y_
-, WVIC: I
2)trap
4 ''T I MACOOIA
1-3701
-C0
Iwo-ISI
I CHROMA I h7
I 5 301
433 .200
1433
-4 AFTMOrM Win -11.111- 11.3.33.31-3Mil
NV INV
Gagw. .CI ON P4404 "4:ills '4"
OP00.0
.0'.=-010 Per 300.1 1.4-11.1
LmAL001A.
3:0
E
1.100, v,sySm
08
SYNC OV
I 1g:I
3P
i>
!IV
i24?>NIY
JVIDEO
0
010
av 10J106,
WTI
.900.9..240920010
9-14/
oPT/011.0
Po 3001
0
PEAK01.0 "
*=0,
-pp To 0-01
r-'1"
CI
4-I
PW400
7000 2700
I
0..30
4..
L MANOOIA
.00
JOY
3565SPLIT T 3
NY
;goC 3A03 0.32
C C
.01. .13
-301V
356530.10010 ,
HORIZONTAL OSC
.33
1.2
VIO
MOPMP
i0i
I
01
TPSPV
40-1.40. 0P406LYNAM"
TO 64P
C 4I C 400 I I co.02 .72 C424
)INC
0103 I.0
N.
I
,:21
®.-----,,, `sir T403loNoT
.3. - PI 4 TOP
$ . 4 3 ,o3 C:10
0
' .34'
.4
Ai T C13402
s 00 11011000 IONIA
1.403..p.C14003T 1407
3567-2.-90p RO
C 20.0!
C PO109
4 70MI,VOL
.10 40
4ove ".Are
MoCP,, 1 .116
0.03
SWIZ .3 3
Or .' 3561 *9I
HORIZONTAL OUTPUT c.
JI
K
GO
*NT
03013.0 10-.31711,- 1,90V
Iv- NI
I390
6103
3585.5
C 60
COON
PEAT SINK
1/41.
TO 41P-avv,POPO. Poi]
MAO 41001.09.01
OLP
PI,G
rc PIT 300 IPPIP- 31
000
oN
aHORIZ NOLO
COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
a
3V P -PVERT RATEA8
O
400V P -PHORIZ. RATE AB 8
11.,01, 13
30V P -PVERT RATE
AIR SIG5S
O
4t-`
O550V P -P19 HORIZ. RATE R
TINTNaos,
6V P -FVERT RATE
AIR SIGAK
0
0T 40011.006-14 .0D
35V P -P0 HORIZ. RATE GT
50V P -PVERT RATE
Al
0
6V P -P0 HORIZ RATE TP-2
17V P -PHORIZ RATE
TP-5
O
C
E
I ..
I 00
4'-(" 5--i
360B-2WsuLasos
MT
1. TO
TI O.
C 031
FCHROM Av 2e.
0$ OF MI1103411.1
C.504
I
H
1.72oArTO 400-
0,-31
TO1..001-10
10-0
01103IMO
Na. 11 ,11 MEI
1.1 4.01-1 VERTICAL
K
11
II
II
5
410
HAIN
TOT0:41!"
1100
C10 114110 TT0 Floa.
050
NVQUADRUPLER
1. $0
Pt, MO
51101.111
sow, FOCUS
OWL 5011
YOKE
P105
0.10
TO v. 2000IC -MI
gi TO 4100 130-.001011,31 30.
vek
T/ 0115
SOT, 510
svossks ic-41TOM 00-T
TO P0194,111,K-0
TOw.00-.01
rv4
57555
2204f.aw
g_
,rte300.
110 I01
.0 01.0.1/T I3552
tersr*
36.1401 "0
seas
40V
100I
3552 Iamyl
IT ,
I IMA00101Aio
Q)5151
e.5 MO MI WIIS1Or
rI
G ieo
DRIVE
JON
1133.IOU
1301Mom
I r 1.!
At3614
MADOOIA-ryB
so
3552./Tol
. 5
Ct
Jtoy Tinf' !OM
.0 S. TrB DR VE
65V P -PVERT. RATE Y6
TIU11110
2 2
01 aq.11.1.13
1.02
Tor MAT10 1111011.
=MO) rh10
1100. SOT
MOAsra 0AIM1
,, c.,
, ....7--- ...,..._____, 450 -.0
011 ,
72S.10 1111330 -, COM
.._......_, .- 141.
C1100. 104-&-.005 . 0, C.C.
TOT0100.
11
C 003 0004103 GOO
COOl Cpl
*005
'413
11
0102 50100 OOT
11111.100512
La'
C11
garb4104. gigbp
OP.
ii4Ot0001WO
01LILT TKO
NMI
CMS
0110.
:25!
C!?
05MC.110 1.0""" C
50151101.
011.2
PNl. 0.11.
Ca CR^il 11.3:
IC.10 0 MO/ 140 TNO
PW 800
CONVERGENCE
22
011/11.TO CI.300. C1,
10-101
1045I/u
300110-11
VAITttTTlO 0.300. IVO
1C-101
T -43
I7V P -PVERT RATE
TP-5
0
><><85V P -P 23VERT. RATE Y7
5500
1:1) [t0.4100
MT .00TAtOS
*go owTO
110000 0 10,11II -I
to ..a/.. i7.1. .0.
4.5 1120.IC -151 OM
VERT HT sms.
Am.SO 111:74TRAST
20.cro
"1"."x.
.11L.AZ
11
NOISE
L__03 Ot 10t NT to s
cv-ki,.0011.4140
IL SCRN11
CI?)
113.FA'
. .T P1
T 1000.00
10 -.0111100T111-01 MA Mal.
VERT_,,SC
HOLD 10
PW 200'IL-,
KINEBIAS
_TO MOM.8-111
0135
1.01
mt5.5 0.)00010-N
TO
1.1 /eau
S WIT /OW
**,
Rol
VC I003
Al 01.0
go
N.
01.5
4V P -PVERT. RATE Y1
RCA SALES CORP.Color TV ChassisCTC49 Series
8 55V P -PVERT. RATE Y2 8
NAd34
MOT.AM IMMO. MO IMO MOM! OP.111,
LOOMIS MAKI MN 1.0003 - MCAT. 1131011101
- - MUMS OIL 111.0.00..1.1101101 MUM 10 MON MI O. M. 1.11010 /MO 051. AM
MAIMS M 1111000 10 011.0. 011111 MIT 010 IMITM 0 MAD 060 MI. Of
IT ONO MTV VIMIMT 0110111 IMMO TII M 5
1315 MOM. 11001 .14 105111110 111.15111111/
1900
Is 0-0
5400
1400 0
KINE
035
4.4
4
52V P -PVERT. RATE K
SAFETY NOTE:REPLACE PICTURE TUBE WITH ORIGINAL TYPEOR RCA APPROVED TYPE ONLY.
1.V115.
WO.
cwt
C.
MX NIT IWO
CIRCUIT
1
MT /Kt
It*et -II ""t -I0114.11411 3
-0 i ...tIT 1 II.
COI
I43
C1OS
51.1(.41(51.1(.4MI
00OTO
ER
C10.51110010
""rOTEL.101
"P.11
11141/010
;;.;:: 03C"
T50.001,
10
1. DOE
15,y
'14104
0011100
13311531
010111.1
MANI
I
COO
11010111.
010511 0003TSuI 7.0101
1100v /005
C IOC
A MA13002Aft.or ";
I 33 00To swww on '"c.'
TOTO41114.16-111MO. -.14.4o- 14-41 *Ica. .c.o4A.I. coo.
.1. Novo I now y 500U1* 110 Iv 112V
POWER SUPPLY
ass
WI
V101
I8VNP2Z
TO11.030..111
MOMMEV-1
4.101
1.10110 1301
vv.041CIO/ GC.
IOW
.----....cr./A .._ _it ....1-4._
T CIYACK
00
111
C0101
10 a-TO MOW
(1O1111500 0.
1.07 ray
Q
COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
1343SYLVANIAColor TV ChassisD12-20, -21
FEBRUARY 1971SYMBOL DESCRIPTION
C522A-1000/40v elect 41.27421-1C5228 -100/40v elect 41-27421-1
SYLVANIA PART NO. C522C-50/400v elect 41-27421-1R124 -4.5K - 15w 36-92898.51
C336A-10/400., elect 41.27344-1 R126-VDR, lms. 76v 38.1525718C3368 -50/150v elect 41-27344-1 R274 -5.6K . 4w 35.9249571C518A-100/400v elect 41.27418-1 R444 -13K - 7w 35-9249554C51813 -100/400v elect 41.27418-1 R514-VDR, 67ma, 20vdc 38-17072.1C518C-20/400v elect 41-27418.1 R516 thermistor 1250, cold 38-17071-1C518D-20/400o elect 41-27418.1 L102 -sound input 57.23832.2
0500
r CATO 1000.
00011
02 x. 00.,
4,00C30.
40040 4,022323MorIVIIPW
101
002
0004.00 ,
/V111169
/37W
)1-
Mov140
0280147
v
01,1 141041., 4-J0 WV, 1 Or CV )"
ori
orto,1,1,
2.10t IP
31
SC100 0COO
011..8.005
0IF Ott
1
04.20 a. -14
Cv
I(
444021.018101
-
SOSL
IST4
I
I74 00'.
ELECTRONIC 7J-TV=LE' L202-44.5MHz IF input ......................... 57-23827-1L204-47.25MHz trap ........................... 57-23827.2L218-4.5MHz trap .....
R254 -1K contrastR260 -250K bright (-201R260 -250K bright 1-211
37.27242.1237-29782.7
L400-horiz frequency ............................. 5500.21365203131:51 R280 -6K blue drive37-23479-4737.11632-18
L404 -focus coil R335 -750K vert hold 37.27242-6
COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMS LI-6 reactance601:110--6p5°h
coil
2-'2237508475:1
50.15904-4R352 -1.5K AGC 37.11632-18
1
R362-100,vert center 37-16021.17L408-horiz efficiency
AND TECHNICAL INFORMATION FOR 5 NEW SETS 7102 -ratio detector 57.235471161853
R370 -3.4M vert linearity 37-29755-6R422 -1K horiz hold 37.27242-12
T104 -audio output 56.16018-9 R442-100horiz center 37.17539.3T200-44.5MHz output R456-5001( HV57-23831-1 37-16020-277300-vert output 56-17559-6 R606-250 CRT bias 37-16020.307400-horiz output 50.27415-1 R609-600 tint 1-211 37.29440-102T500 -power x former 55.27416-3T600-chroma output 50-29658-1 2629-5000color 1-201 3
37-29755-67-29783-5
R616-5000color killer
T602 -band pass 50-274051 R629-5000color (-21) 37-29440-101
sTc604100--buiFrssou rd detector 1N295t 50.27406-1 CB500-circuit breaker 29.23918-1
13-85962.1 tuner - UHF 54.29184-4SC400,SC402-horiz AFC 1N4092 13.154651 tuner VHF (-20) 54-23858.13SC406-focus rectifier 13-29656-1 tuner VHF 1-21) 54-23858-12R110 -25K tone 37-27242.8 yoke deflection 51-29986-2
014 AfC18081L
0.X:)no
"OM II 1.0111Lel.
s.3.1.3:304-1:484 S*08
Patios 0070.0_J
1 . . le
s 41.1don
0202
tnatti
41131
04400
_
1. 1.1L 200
C)1 10NA°
FYI
10
i:11883401
sCt001
togl 13 "j(1....1.141 22.41-48 0022
1 023 0124°°'
cu.
.1134
:A°44c4420dd.
410
'""101[51, 0-112.0041MS 2. 00.8
00
Solo: 430412.1.41r);02 'en
00701
0)0213-29432-12018 01.Tr11
500ion
1Tv
01002200 13-2<9033-2
otcvAG Am.
HIV
4405000
10042
.3.7204
<Sit..1.5%
of1426,"'T.T
030403
040413-29033-211.34. GAT.
32301115.,5_9
SA
_L -4;f0
I )5211-20 08111000 1-2. vAre 1
±V .
iII CM- -f( 1 .0.02 T°e".1 nal WV lad ,i;
11
10
>
-)1F 7"7? ,V4:3i-cav
m1
sqT7 . - -.F1n.., ,. r"1I 0202 AICT 0204IS -23824- i *2 +0 An.. 12-2311241421.
7.003 II I t r 3D 03 81 . A. Qt.. !lb .1.
!gm
IS . /PS01.Ad T won
1 Wcf.
TMX !2A .001 54s 104
AIMS
no,.
7104
1181,be
010113-27432-212.0913-27432-11704147ST. MI
3404
020421113-210334
/ST V1010
Ai.4.4
-40 TO ® 00030 Id6..7506
04.014.
,.ov
01220 011.2
4241/28LUSVIM. Ott
Cli4114
0oi481.-
010113-23826-2
2880 v.oto 4.
-e
ugg
I Ltr0
OT2Lo.
r r
<244
nun
T4fY112.4,LAM
0501(000. 1.2r
4 ffILIVNIVOVI
4340 2324.,
vIVVAT1/2 GUMOUT,
.011
sAwisaose
081
101112
71(30400
001CC
TX. .1542204
5002
TIc>. N 2S92:Kw
4344420412,
WA., MOhi IT
140'440
1114 IMO
etc
TON_.2211110
I .Ss,
4333VISIT 00.02003
2144
!Si ..420SI)
44.21.214111
TO
61311
van C211303 04.
tut/010
1.112110101
00124120
004
'44.241.WI Mon
34400
TO 4302 2214 0050
-- ITs®-LT4
PEI 2
AS
PER
10454TOIL
r
TO 0500 TO S500
C).-1® ®.
011 DIFLECT04 sotoo arrow so
P34
111411 !
,
onS44.1A
dare., )1La.%OM IN
Cl!o
00.2
IHN.:11e1
Hv, Iv,
4420
12100
3-29033-2OTT ,NDIO VI
COSI 044n 3 OH4
O420
0
A
2412IOM
Th11003
djt
MIAear
SW
oo13-29033-3
ACC 4.
1111040.1
rx 1SV anoso
13-29033-2 non0004 .11.re
amo22.
303ACOOP loss.
4401240 ftCOT 1143
CD- o84.01LIA0T00
10 PO.4411VII4AA
040ISAM 13-27404-2
41..1;V:
.04100
0 M30005001
*oat03000
"pH
HI
040
IMAM01.2CIllsatmoT
tie SCOPE LIAO 20 MAASS.00.05 ATOMS CO et Mist OC VOLTISS
2.434
Orno cs c
0 0...al112810
.18.87,1
1800., 21888
.40088048/ 05000
11
VSSC U 3
V 10C111811.8
,2 42
1001.1. V
.813 ,S.,0.I.4.410.8
T. c .-1,-.:::. o 0,..,,.....
20 44 . 250V L101 0400 4.104014211 v r
s 6BK4Cr. v. 0 S L 00A TP7L,Ss'
which°. oo.so
.44134.
0444
C434
ate Salarc.
444120881
4442
1.20; o -
TO.
4 444VVS.ONO..41144.
-22424
0450WA. 0...
I -
000v
i.,TE.L_±.H°u0..
Tirt
/7'i0 T&u
s420 O0 v 210084011
44400
ro(D 0002
0
F
COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
A
0
500OT
O
MM. OEMS MEE. =
Oi
yk; 1,300 Ci
11.10
0111411.1.
To 1ss00© ®TO S6S00© Jo
0604N. 13-29035-2- 6.,or c.o.. 0,40
T '0
1 7reV11. 0 22 VW
Nod3.5 IMPO Vert.
/OP., V/
0
43. 12141-E
4014 3.010
-
6.64/ON
IMMO1041
3000.3,514-3
:ttcy
C
WON14
OKI
CO.34013
11104.7
300.lot SUN ./1,4NO. UM
02,00
r.
13-29033-3
;INA
writ".0
A L6s u4
filan
r.
.30TRH
1,04
St.
COS*SSis
PG
}TT
11340
ru 0.41
60 VIPVors.
0002
OfAIV
* iM
:!"1
DMA I
d mm0 awn .=
6 /36.r
.9
TO 0 ONCMOS. SO
are on.006
ET/3210011
147MOT
6 VPP 0Hera.95 VPPVert.
/1.1...01ET YOWLS USE1111E2SAJP22 OR 25AJP12
1.0601 matotsit atMV 25VAC P2t
44.4 In NOT 10,IN-01010 KKKt 111.01111116.L. SAME TT. ON.
,..0611- F1=0s.
-44.4
0000 - 11.111 '''
s rt+ALJlr
CV.= C66
T7Z10
.
1
PAM
1.36
I
1/2 661113ATRW CON..
FEW 4.2244M t6
311:40
=Carenon,-4/7V/-461/
.-1n, 62.6
341.,OUTPUT
VMS -
0 130
0
T
0
0
'I
d H KYMOW.
ronTOOT
200
60/1c
1104S2062
IPG00n
5000. ZorV).0004
0
IQ
1.14 20.101134(E.0E0N
G.
.1.11.C410.4,
3011.00
NOSS
.r124
00A
4402sonPOT. 11,4044 F.
f0101311.
0
7":7,1
V...!1000 01
Nor
i.
.;IA*
.04t2:, iron b
OP.GOASOT,.vim
.N.. F.10.1/JuST30 00 NOT
104-.31 Amt.
O
Or
W010000060Ct
tt;
1410
1146WOotobHY
1,g3
0(r°0 NE .3
ho.
n
Itt ISOn
00
001 6.006
T
.6
Ha.
10
tlrR_4011
TO .360s
0100.02060104.0001
0005.0006 0000.02000100.0300.0303 41300.0300, 0303o0306.0000 700)00.060000.01 0110,100 Tw6y 016. 01100
NOTES 00.0113 (awl 0014. FOR PEON.. .1101110. 0.000 N.V. TO LS. MIONTNEM 13 0.3.C.
o. 3013.1TE1
O 36 VFPHari, 0 90 VPP
Mori,
Nona.15
17 VPPHen,.21
4 VPP 17 VPPHeria. 27 IleH a.
58 VP'
SY LVAN I AColor TV ChassisD12-20,-21
I' ils s
iiI11
17
26: v PPHo,,,
.5 VWMar. r
68 VA'H.,
3.6 VW-I 8') Hon;
40 VW 115 VPPHo..,. 271)
10 VPP 10 VPP3, SIMI Nona. 0
(UHF SEARCH ON SOME
TuNutoDENoTES13-29033-3 .1.;
1702
Assts
ONLY)0sY.30NC26
' AFC AMP
DENOTES 13-29033-2
GAT0E,94:1.SOCKET
13-23824-1' 4:01100 f'
VOLUME QVf!--E1ON SOME SOCKET - - - - - - - -' GATE
viAblr 13-iru?r -3 c
!AFC
IF.
MODELS (AFC ON SOME
b
CHASSIS ONLY)SEARCHRELAY
.z .00(6m1600 COLORR8 .1 1+20V FILTER
13-26666-1...1
b
ONLY
.`4213:218019s3)7006233AUD
5-1 I-14,-22 CH. ONLY)
OUTPUT
13-29033.3 (ALLu013'EHDERONCHc22-eot
DRIVER
SPEAKER
:---D.:...cus°UTTR::PtnYiP:6043
0 200
.
)11,1
b
b 13-23822-1 6b
REPLACE PDX TUBE WITHORIGINAL BASIC TYPE ONLY0 6041 ji . .
1ST POI 170
.13112.0.0220238.21.:n" --------cAll IMIOFI S
[9].OUTPUT AMP c
..IC100
±iF Ac4030,30,(60/2.,F.:1AVBAC....P22L5\
REACTE GaHoesAc(
11412. CA3014 b
0 204 ....6,1 SND IF /DET / c 0304 SRC 25AJP22 OA
0
1ST
VIDE601,4A r.
Ir.-17;3_23826d1\,z...2..2
6 A J5PA2j2p ill13-23824-1 7.., 0206.
13-27433-1.
06140602 6 0600
Snit, 1)1,1CPCDCAIIAFP'' . 13-23826-2'0 2ND ;61010 AMP c
ANODE VOLTAGE
3. 56 LIN
HO:(2°A;ACJEGATE
1.
2711,:ip )6
18URSsET
+70.bs,.
c . ,.
c
*b. cilo_.,11. (UHF SEARCH (743011
+ 2SKV
Ell2ND CHNDVA 1ST CHROMA AMP -01,1
0612
AMP
............. ......,ON
SOME SC4.010 El +
0)3004551S
ONLY) REG. 6
AFC
e .- 06(0OVERRIDE 4 '24
DEGAUSSINGan> Soot( T
((i0
13
60 VPPVert
185 VPP8,
41k; 111119
6.2 VWMona.
1403 VWV.fi.
(1,D230 VPPMeru.
61119 VPPHari,
24 VWMori.. 26
REPLACE ALL TUIESB TRANSISTORS WITHORIGINAL TYPE ONLY
INILICATES TUBE PM(
4miHORIZ C>CENT
12HLTVIDEOOUTPUT
13-27432-21-10,11.44,-21,-220NLY)
13-27432-1(ALL OTHERCAASSIS)
6LU8 SYNC NC
VERT. OUT PUT/VERT. OSC.
68L8.01412 OSC
REACT. CONTROL
GCE3/6CD3DAMPER
YOKE 6LR620417.
OUTPUT
3CU3ARECT
CONE.SOCKET
613K4C0.6 REC.
01300AFC
OVERRIDE cork%
TRANSISTOR ELEMENT LEADS
4- BASE.-EMITTERC- COLLECTOR.-WELD tGROUNDI
-IMPORTANT-
DO NOT REMOVEOR INSERT TRAN-SISTORS WITHPOWER APPLIED.
,;,..400,001,4p""V
31VPP
H.
250 VW33 Her) 4. 34
150 V PPHo, k
2.8 VWH01, k
12 VW3 58636
I5 VP?Herla.
20 VW 50 VPP(JO Ho,).. 66) Hari.
/07.7-
3717 VW
38Vert.
00,000,so,
3920 VPPVert.
111040010.4440101.
0 9 VPPVert.
10 VPPV rt.
....*0 11 VPP
Vert.
!I P42
.3 VPP
COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
0 1.5 VPPH 0 , 11. 44
9 VPPHona.
1344MAGNAVOX
TV Chassis T941 Series
FEBRUARY 1971
ELECTRONIC 7 #=LAzaTECHNICIAN/DEALER 1-J
COMPLETE MANUFACTURERS' CIRCUIT DIAGRAMSAND TECHNICAL INFORMATION FOR 5 NEW SETS
NOTES1UNLESS OTHERWISE SPECIFIED,L ALL. RESISTORS ARE IN WATT,10%.2. CAPACITANCE WILLIES GREATER THAN I ARE IN PICOFARADS AND
VALUES LESS THAN I ARE IN MICROFARADS.3. ALL CAPACITORS ARE 10% TOLERANCE AND 50V MINIMUM
RATING. EXCEPTIONS ARE NOTED IN REPLACEMENT PARTSUST
4. VOLTAGES MEASURED WITH VTVM FROM POINT INDICATEDTO GROUND WHILE USING A 120 VAC POWER SOURCE.
5. VOLTAGE 111 CURRENT MEASUREMENTS MADE UNDER NOSIGNAL CONDITIONS WITH VOLUME CONTROL SET TOMINIMUM. CONTRAST AND BRIGHTNESS CONTROLS ARESET TO PRODUCE A NORMAL PICTURE.
6. FI,F2--ETC. INDICATE NUMBERED TERMINALS ONH.O.T.(FLYBACK TRANSFORSIER)T105.
FROM 'IF OUTPUT' TERMINALON VHF TUNER ----
C123I4°
S9
L101r -
1ST PIF AMP0101 25492 7
.1.
P10115 n ISO
TO PIO S2
R1356800
47.25MHz
goi 15V
__-J1.10341.25MHz
L102 R131*R:C4
$T5600
0117.04
;-11RI30*2700
SIF AMP0106 250544
V
9.7V
SYMBOL DESCRIPTION MAGNAVOX PART NO. R807 -5K, sub -linearity 228016-29R808- 1K. vent linearity 2213016-27
L109 -deflection yoke ............................ 368047-2 R809 -50K, vert frequency 22801613L110-horiz stability coil .........................36805614 8810-10K, horiz frequency 228016.8L112-horiz filter coil ........................... 368056-15 R811 -1K, AGC level 228016.27T101-vert oscillator xformer ...................... 328021-1 8812-1K, AGC 22801628T102-vert output coil ............................ 328010.2 R914 -1M, sub -bright 228016-26T103-horiz oscillator xformer .....................328021-2 010 -damper diode 5313017.1
T104-horiz driver xformer ........................ 328021.3 D12 -focus rectifier 538010-107105-horiz output xformer ......................368056.17 TH1-thermistor 238008-1T106 -power xformer 308006.1 TH4-thermistor 238008-1R801 -10K, vol On -Off 228016.25 TVL1-VDR 2313011-1R802-500ncontrast 2213016.24 0.5 amp fuse (ac) 188031.28803-500K, bright 228016-23 1.5 amp fuse (dcl 188031-113804-3K, horiz hold 22-8016-22 UHF tuner 3413006.18805-5K, vert hold 228016.21 VHF tuner 348005-1
R304 T .04220 4.
SIF-2 - SiF -3
-liC302
2
C30471204
4.3V
C303 -
R3034
'04560 J
SOUND DET.DI.D2 1318822
TP - E
133051200
C306330 cxe
iOmfd
R30?3300
R306R306 0307 33001500 330 7P -F
C309 LI15 514CO2 .1 1541.
2ND PIF AMP0K/2 250927
L104154.1
15030
61,n.
0.35V
TP-130-T--iC103i-113110(11
10
C.104I
C105 Ri09 I50050001
390
75V -
1
MOST igIOK v v
R1075600
I1.11V IIV
-CI205000
3RD PIF AMP0103 2SC705
R132 L105rlIQ° 15y
i
NF - 3
R110331t
AGC AMP0111 2SC536
1.IV
C106$ J -5C00
AGC KEYERL 113 0110 2SC536150H
TO MIC TERMINALON VHF TUNER
c-- ---CI26
- lOmfd
P128a:54 1.25V
R112K92
2200
3.2V 10.6V
P4
C320
0910U7D120sc95MI-T-A36 QQ1p001598102205sUTB04054UT
C
m
R3 '13101211
I')211(7-41611
3
R3I5560
R313 Wv100
63V
123V
1;NR3121*4. 82
:T410C3_130444
11.4VTM-50106
8316 4.2v1200
-C312 coyT 220
06V
0314100 WO
11.9V R319
17.1275.6,l. 2w
1/2W C3I JIWW 200m14 S.
6.5VV
1
C316R3113 200mfd
12.
1/211/WW
CIRCUIT BOARD-9061-30137_ _
(POWER SUPPLY AUDIO)
P6
VIDEO .DET.Do 13188or INGO .
C1197 R117,
81333100 90;
*5000 22I(
100 *P-DET. 111119
4.1 81g::
:RH4*
61-
"C
R111,12 ;1-C1 IC110C107 I R113* 15°3716100 * Imfd
5000-
270 -
=C1I3
`31.3) T &iv6JV
ICIIX41g
AGCAGC LEVEL
0.42V -$R912 R911 - R12411< 115 47114
S13C.41
P127100
03v
ovIVr
81263300
C 115 I30400
S6
C124 10 mfd
10AV
9.7V
RS K3 I. #13123C114
'Itmoo
5 mfd
11.3V
VIDEO AMP0104 2SC715
J1'
EARPHONE
R320220
1,2W4--16 n
ELECTRONIC TECHNICIAN/DEALER is pub-lished monthly by HARCOURT BRACE JO-VANOVICH PUBLICATIONS, INC., 1 East FirstSt., Duluth, Minn. 55802. Subscription rates:One year $6, two years $10, three years $13,in the United States and Canada. Other coun-tries: One year $15, two years $24, threeyears $30. Single copies 75¢ in the UnitedStates, and $2 in other countries. Secondclass postage paid at Dansville, New Yorkand at additional mailing offices. Copyright1971 by HARCOURT BRACE JOVANOVICHPUBLICATIONS, INC.POSTMASTER: Send Form 3579 to ELEC-TRONIC TECHNICIAN/DEALER, HARCOURTBRACE JOVANOVICH PUBLICATIONS, INC.,1 East First St., Duluth, Minn. 55802.
VIDEO OUTPUT0 105 2806 BY
700L 13201
88
4:R9
i
52°1° I
::I'213,30180211C90622°4103:42V
1s211317;132
61F-
I.
f:A7:01
:I_ _1 -r;n00
47
7P- DC1822131ISO 27000
L1064.5MHz
UV
5.7V
L10745MHz
D3
SO-1AUFC207.005
R204 C2041500 °add
R20522
L109 621027001 22K
U7-I1W
C205R206 .29200
-30129 r- S12 CONTRASTI 82NOISE CANCELLER SYNC. SEP.
0112 2SA 201 0113 23A201
C125 10
-C122 R404 °349011
R403
220m1 dr 15000
10K
infer-, 022C401_1_
2711
43V 0-11-4is.4V
' VA64V 007V 8402
1500
IS 88 L.40410114
53
R407 C40319K
840 imfd13
22K, R404!82011
CIRCUIT BOARD 0-9061- 31671OF,A6C,vIDEO It SYNC)SWI(PART OF 1111100
cCUIUICNT DRAINA14061ACRT HEATER
rob 403 .0'*4 REGULATORC A 0120 250 30
R712 T1062.21101I/2W
AC 120V 130Hz
91 40214 o3
ACJUMPER
PLUS
j13709330211
cnn
22001461
015
Ph 9- 22/1
20
4
1.5A
P7
REGULATOR012101222018712 12V
1105 TERM. F12
R74071*
6702 420sys
-s.sv
P9
Ls C704200mfd
113/2.6V zR706 41.4.,_014270 S2-7
-03V R7,0100
P13
144
-0.3VREGULATOR0123 23E1407
LII73304H
5
CIRCUIT BOARD(AUXILIARY)
CIRCUIT BOARD 0-9061- 301172(POWER SUPPLY 8 AUDIO)
T- U22035
7105 TERM F13
PHASE INVERTER0116 2SC536
2.7V
R 405*4700
---1
S
-Tow"CIO #
1-An.,,d9.5V
D6V -FRED
i.c"---1N---.-je30R909 ISO850.
50K
V -H01.1)
R905511
HORIZ OSC.0117 250536
C601Smfd
-4)0 V
R601
6,Z.00
R6026130
11.9V
0.25V
C602 0701 15188
C627330
C603 0 8R603 .01 !SIN690
12VW9
CIRCUIT BOARD(Aux) 1-1122035
H- FR E0.
Cell .
32.1IR606 P610
1500 10K
R607560
C604
.rmf605Id
P6126905%
4609 1.110
2215
T103
II 5V
C6I0
R6013 0606 0607 R6136800 I .05 I 1500
02 1/216
7 H -HOLD
R904311
.05
- R902 500
R20912011
$10
17
20V
58
VI PICTURE TUBE240064
OM HTR603 3500K
6900 ,26207 10626
513
C6
C206
° INit 0
II
R208100
VERT. OSC.0114 239187
mo.,0511 R503 I 30.44 8505 ,C5041 220 0505 R509
303014 .6,5%
305060efd
R50122K
0615188
R502 C502 1
C501.01
.01
I T 01
R513
is TH-2 69050106
C5073004 3U13
R50756
R506
1500.4
R8075K
V-LIN
13808IK
VERT. OUTPUT-1 0115 2313407
t21o) no c50., .0. 1109 .
v." 500- -000TH-3SOT20 11.3V
T,,1? C509 R5 i
..". TVL-1
C.0510.4VOR-11/5
II.5V05
3.11V013
T 102
0
012
R630190K FOCUS
HORIZ. DRIVE Hal :DLITPUT0118 2$8405 1 0119 239375A
R616 56
R617330
TN-SOTO6
704
R61 11.9V220
$ R6190611 33I.03 I/24,
CIRCUIT BOARD 0- 9061- 30272(DEFLECTION)
09
2V
DB 11 6VWIDTH
TCB- uoR2AC2 0RU3D1 A u u
W9- - TiO5
.7-1018 H.V RECT.
016 0515 /IS0702 *
2COOff470mfdi
FiR634
C622 MO II 1/2,4,001, IFt F6 47,
F4AI 04 vv. 4D II F7
SO- IAHF
F5
H -V
S3F12
F13
1/2W
8632 R631Leg 10K
5 6 7
1/2W
R62547011I/SW
CIRCUIT BOARDT- U 220 35(AUX.)
IC623.022
SUB MARTR914
IM
F2
MV.WV AT ZERO IMAM
CURRENT
a D12SD- tow
100V1
FI4 S R623it 470
=C617 R621 VSW156,1/2W
Fl I
016 wz,SO- WHF P629
156,1/216
CIRCUIT BOARD0- 9061- 301172
ROWER SUPPLY AUDIO)
COPYRIGHT 1971 BY ELECTRONIC TECHNICIAN/DEALER 1 EAST FIRST STREET. DULUTH. MINNESOTA 55802
L
(TH
PROVIDES YOU WITH ACOMPLETE SERVICE FORALL YOUR TELEVISIONTUNER REQUIREMENTSAT ONE PRICE.
VHF Or UHF Any Type $9.75.UHF/VHF Combo $15.00.
In this price all parts are included.Tubes, transistors, diodes, and nuvistorsare charged at cost.
Fast efficient service at our four con-veniently located service centers.
1 year guarantee backed up by thelargest tuner manufacturer in the U.S.-SARKES TARZIAN, INC.
All tuners are cleaned inside and out,repaired, realigned and air tested.
TUNER REPLACE
Replacement Tuner $9.75.
This price buys you a complete newtuner built specifically by SARKES TAR-ZIAN INC. for this purpose.
The price is the same for every typeof universal replacement tuner.
Specify heater typeParallel 6.3VSeries 450 rr ASeries 600 rrA
All shafts have the same length of 12".Characteristics are:
Memory Fine TuningUHF Plug InUniversal MountingHi -Gain Lo -Noise
If you prefer we'll customize thistuner for you. Tie price will be $18.25.Send ir original tuner for comparison pur-poses to our office in INDIANAPOLIS,INDIANA.
TUNER SERVICE CORPORATION.-TORY-SUPERVI-_ _ . SE.
MIDWEST 817 N. PENNSYLVANIA ST., Indianapolis, Indiana TEL: 317-632-3493IHome Offices
EAST 547-49 TONNELE AVE., Jersey City, New Jersey TEL: 201-792-3730
SOUTH-EAST 938 GORDON ST., S. W., Atlanta, Georgia TEL: 404-758-2232
WEST SARKES TARZIAN, Inc. TUNER SERVICE DIVISION10654 MAGNOLIA BLVD., North Holly wcoc. . TEL: 213-769-2720.. for more details circle 129 on Reader Service Card
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 19
HUGH "SCOTTY" WALLACEPublisher43 East Ohio StreetChicago, III. 60611(312) 467-0670
PHILLIP DAHLENEditor1 East First StreetDuluth, Minn. 55802(218) 727-8511
JOSEPH ZAUHARManaging EditorCAROLYN SANDAssociate EditorDEBBIE GOLDBERGProduction EditorBOB ANDRESENGraphic DesignLILLIE PEARSONCirculation FulfillmentJOHN KESSLERManager, Reader ServicesBERNICE GEISERTAdvertising ProductionTOM GRENEYPublishing Director
MANAGERS
ALFRED A. MENEGUS757 Third AvenueNew York, N.Y. 10017(212) 572-4829
DEAN GREENER43 East Ohio StreetChicago, Ill. 60611(312) 476-0670
DONALD D. HOUSTON1901 West 8th StreetLos Angeles, Calif. 90057(213) 483-8530
CHARLES S. HARRISONCY JOBSON57 Post StreetSan Francisco, Calif. 94104(415) 392-6794
ROBERT UPTONTokyo, JapanI.P.O., Box 5056
ELECTRONICTECHNICIAN/DEALER
FEBRUARY 1971 VOLUME 93 NUMBER 2
This month's cover, supplied through the courtesy of P. R. Mallory Co., depicts a burglaryin the process of being attempted. It may be thwarted if the house is equipped with anultrasonic intrusion alarm.
3 TEKFAX: Up-to-date schematics for easier servicing.
23 EDITORIAL: Industry Involvement
24 LETTERS: Pertinent comments concerning past issues.
26 READERS' AID: What you need or have for sale.
30 NEW AND NOTEWORTHY: Merchandise of special interest.
FEATURES
33 TEKLAB REPORTPart II-More information concerning the unique features that have been incorpo-rated in RCA's Argosy Portable Color TV set.
38 ALIGNING FM STEREO RECEIVERSTechniques for improving FM receiver sensitivity and channel separations with theaid of a scope and alignment equipment.
41 SWEEP ALIGNMENT POINTERSJim Smith describes color -TV set IF signal curves that should be obtained in order toobtain the best color picture.
44 GUEST AUTHOR: THE INDEPENDENT DEALER -DISTRIBUTOR RELATIONSHIPA. M. Effron, this month's guest author, describes the value of promotional incen-tives-gifts that are offered to improve sales.
45 TEST INSTRUMENT REPORTReviewing specifications for the Heathkit Model IB-101 frequency counter.
48 TECHNICAL DIGEST: Hints and shortcuts for more effective servicing.
54 COLORFAX: Tips for easier color -TV set repair.
56 NEW PRODUCTS: Instruments and components to make your job easier.
62 DEALER SHOWCASE: These items may increase your sales revenue.
67 TECHNICAL LITERATURE: Informative material that you may need.
68 ADVERTISERS' INDEX: Manufacturers concernec about you.
69 READER SERVICE: A source of additional information.
0,41 A HARCOURT BRACE JOVANOVICH PUBLICATION "Al -
ELECTRONIC TECHNICIAN/DEALER is published monthly by Harcourt Brace Jovanovich Publications.Corporate Offices: 757 Third Avenue, New York, New York 10017. Advertising Offices: 43 EastOhio Street, Chicago, Illinois 60611 and 757 Third Avenue, New York, New York 10017. Editorial,Accounting and Circulation Offices: 1 East First Street, Duluth, Minnesota 55802. Subscriptionrates: One year $6, two years $10, three years $13, in the United States and Canada. Other coun-tries: one year $15, two years $24, three years $30. Single copies: 750 in the U.S. and Canada;all other countries $2. Second class postage paid at Dansville, New York 14437 and at additionalmailing offices. Copyright 1971 by Harcourt Brace Jovanovich Publications.
POSTMASTER: Send form 3579 to ELECTRONIC TECHNICIAN/DEALER, P. O. Box 6016, Duluth,,.iinne,oh. 55802.
20 ELECTRONIC TECHNICIAN/ DEALER, FEBRUARY 1971
There'sa bigplus...
MALLORY
When you specify Mallory semiconduc-tors. It's always been the most dependableline . . . for more of what you want, whenyou want it. And now there are more extrasthan ever before.
For one thing, we've added items to makethe selection better than ever ... from pre-tested multiple -cell rectifiers-such as thepopular VB, CTN, FW, and FWL types-tohard -to -find tens like our 2.5 amp rectifiers.
Then there's performance - it's evenhigher than before. Our rectifiers havehigher forward -current capacity and lowerreverse leakage. And our Zener line hashigher wattage ratings and sharper kneecharacteristics.
And don't forget Mallory semiconductorprices: they're just about unbeatable . . .
take our focus rectifiers and epoxy caserectifiers, for example.
So specify Mallory for silicon rectifiers,prepackaged rectifiers (voltage doublers,center -tapped full waves, full -wavebridges), color TV selenium rectifiers,Zener and dual -trigger diodes. YourMallory distributor has them now.
MALLORY DISTRIBUTOR PRODUCTS COMPANYa division of P. R. MALLORY & CO. INC.Box 1558. Indianapolis. Indiana 482043: Telephone 317.638.5353
Batteries Capacitors Controls CRIME ALERT DURATAPE Recorders Resistors Semiconducto SONALERTA Switches Timers
. . . for more details circle 133 on Reader Service Card
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 21
10 million reasons whyit pays to promote matrix,the brightest, sharpest color picture tubein RCA history!Reasons 1 to 10,000,000. Large -screen MATRIX can up-grade the performance of at least 10 million color TV setsnow in use. The RCA MATRIX 23VALP22 is a direct replace-ment for the 23VANP22, 23VARP22, 25AP22A, 25BAP22(Chromacolor), 25BCP22, 25BGP22, 25XP22, and 45 otherindustry types! Giant -screen sales potential for the RCAMATRIX - practically unlimited!
More RCA Color Picture Tubes are stocked and sold by
The RCA jet-black matrix'It soaks up room -light normally reflectedback at the viewer from the face of the tube.Result: brighter pictures because now there'sno need to "filter out" brightness to maintaincontrast under strong room -light conditions.
distributors than any other color picture tubes in the itdustry. So, MATRIX is more readily available to you nmatter where you are, to give your customers faster servicand ring up more profitable sales.
MATRIX is the brightest and sharpest color picture tubin RCA history!
Here's why:
The RCA MATRIX phosphor -dot process'First, we developed brilliant new phosphorsand a unique screening process incorpo-rating a jet-black matrix. Then we depositedthe 1,200,000 red, green, and blue high -intensity phosphor dots precisely within theblack matrix. Result: brightness doubled withdramatic improvement in contrast and clarity.
The RCA MATRIX pictureSpectacular! In operation, a new, uniquehigh -resolution gun "shoots" the phosphorswith more energy than any other gun pre-viously available. Result: black matrix +phosphors + high -resolution gun = maximumsharpness over the entire brightness range,truer colors under all viewing conditions.
New 4 -color consumer flyer on MATRIX is available from your RCA Distributor.RCA I Electronic Components I Harrison, N. J. 07029
Magnified drawing "Simulated RCA
EDITORIAL
Industry Involvement
ELECTRONIC TECHNICIAN/DEALER exists to serve you as a member of the electronics
industry. Although Joe Zauhar's and my personal electronics backgrounds, plus our continualpersonal contact with others in the electronics industry. helps us maintain an awarenessof your interests and needs, that is not enough!
You, our reade-s, have fortunately been a very vocal group, frequent to express your needs,interests and opinions by either letter or telephone. When comparing notes with othereditors working in the same building, it becomes apparent that our industry is unique inthat respect. Although as dealers and technicians we find ourselves placed in competitivepositions, it is not the kind of competition encountered elsewhere. In other industries, theextreme jealousy over trade secrets often results in communication barriers. We, however,can be proud of the fact that those in our industry are typically congenial, having the
"gift to gab," the desire to get together to "cry in each other's coffee," and warmhearted enough to care about the other fellow. In what other industry would a Readers'Aid Column-such as the one published in ELECTRONIC TECHNICIAN/DEALER-result insuch good responses, promptly providing those asking for help with assistance fromtheir fellow readers? Many a reader has sent us a note expressing surprise at the amountof help received 'rom other readers as a result of our publishing his letter.
We appreciate your active interest in ELECTRONIC TECHNICIAN/DEALER and look forwardto continuing such communication. We intend to continue to respond to your commentsso that this publication will fulfill your professional needs.
It is our belief that with the increasingly complex technology that must be masteredfor effective sales and servicing, ELECTRONIC TECHNICIAN/DEALER must continueto emphasize that aspect of our industry-devoting its primary attention to that subject.However, it is not enough to merely possess adequate technical skills for mastering today'sand tomorrow's e'ectronic circuitry. We are in a field which requires continual contactwith the public and a good business "sense." As you have probably noticed, werecently began including articles related to that subject.
Despite the outgoing nature of most technicians and dealers in our industry, we are inclinedto be quite independent in our thinking and actions. Only when faced with some commonthreat do we tend to ban together. Although we do care about each other, as proven byour Readers' Aid Column, the professional associations across the country representonly a small portion of our readership. We feel that this is unfortunate since these local,state and national associations are excellent for supplementing the technical andbusiness information included in our publication, they keep us abreast of service chargesprevalent in the region, help us to compare wholesale prices, make us aware of outsidethreats to our business and help us in petitioning for local ordinances which may offerus better protection. Some associations even offer credit plans to help improveretail sales and group insurance protection.
As a publication, we are also very interested in these associations. Unfortunately we aregenerally advised of meetings too late to publish that information or attend, but we areattempting to rectify this situation. We would appreciate it if you would advise usthree months in advance concerning the date, location and activity planned for yourassociation meetings. This will permit us to publish that information, thus hopefullyimproving industry interest and attendance. And if these meetings can be fitted into ourschedule, we hope that it will be possible for us to be there with you.
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 23
LETTERS
I suppose it is the crust left overfrom Christmas celebration that givesme the nerve to comment on your ex-cellent article, "Tuned Circuit Sig-nals."
Fig. 7 causes me some wonder thatthere is no crossover point, which onewould expect with a two -to -one fre-quency input [or a single curved line(complex or not) if in the correctphase-edge on]. I also tend to thinkthat the pictures over Fig. 19 and 20should be exchanged.
To me, it would seem that some ele-ment of the fundamental square wavewas present in the scope pictures withthe exception of Fig. 19 (corrected).Since "continuous sweep" produces aneven sinewave and all the inputs usingtriggered sweep or even the other Lis-sajoux patterns all show somethingakin to Decay-the response to a stepfunction, I speculate that there is someunwanted pick-up.
Fourier would lead us to believethat each of the harmonics of the waveshould be of constant amplitude, what-ever their phase relationship to thefundamental. However, in all cases
Who Needs a
Tuner Wash?Use
QUIETROLEMark II Spray PackThe product that cleans and
lubricates better than anyproduct you can buy and hasbeen used for more years than
any product of its kind.The Choice of "Better
Servicemen" Everywhere
manulactwed by
QUIE TROL E cOMPAN,Spartanburg, South Carolina
but one there is a pattern that decaysover the period of a half wave, or be-tween the positive and negative excur-sion (step) of the fundamental. In myhumble opinion, if the fundamentalwas truly filtered out, there would besome sort of pattern that would havecontinuity over the full period of thefundamental and not such definite"separate halves."
You state that the horizontal inputin most of the illustrations was thefundamental sinewave from the gener-ator and that there is a noticeable de-cay factor in each figure. But then forFig. 21 you state that you are usingthe scope's sinewave sweep and I seethat there is no noticeable decay-in-stead it is the pattern that would be ex-pected when beating two sinewave fre-quencies in the scope (Lissajoux). Itmust therefore be concluded that thesinewave output of your signal gener-ator includes higher partials and is nota sinewave at all.
Believe me, I am all for this sort ofarticle and would not want my com-ments to discourage you from suggest-ing that such investigations are not justtextbook fillers, but have actual practi-cal value and can be reproduced onany workbench. I think it was unfor-tunate that you did not mention thatFig. 22 represents a 90° phase differ-ence between the horizontal and verti-cal inputs and that the rotating, slant-ing ovals represent other phases in ad-dition to not exactly matched inputs(frequency). These are all things thathelp to get the most out of a scope.Many technicians are all too prone tothrow everything aside that smacksof theory, saying: "We don't have toknow about that sort of thing."
JOSEPH G. BRADLEY, JR.
We appreciate receiving your de-tailed letter. It is good to know thatafter going to the effort of digging outinformation for an original articlethere are subscribers, such as you, whoare interested enough to read the ma-terial closely.
You are correct in stating that thephotographs for Fig. 19 and 20 weretransposed on page 51 of our Decem-ber 1970 issue.
In the more conventional scopetrace (Fig. 18) we see that the har-monic frequencies are subject to decay.This is not what would be expectedfrom the Fourier mathematic model ofsquare waves. However, this theory ig-nores one important reality-it as-sumes that all components are withoutinternal resistance and function at 100percent efficiency. The rate of decayobserved is dependent on the tuned cir-cuit's efficiency or Q factor. The higherthe Q factor, the lower the rate of de-
cay. By using two resonant circuitstuned to the same resonant frequency,we can increase the total effective Qfactor and reduce the rate of decay tothat shown in Fig. 20 (corrected) ofthe article.
One simple analogy can help furtherdemonstrate the limitations of theFourier concept of square waves. Asquare wave can be coin pared to avoltage that is switched ori and OFF ata constant rate. But assume that thisrate is but once every 2 sec. We cannot expect the surge in current, whichoccurs as the circuit is switched, to besufficient to maintain a continuous har-monic sinewave during the entire 2sec. interval.
You are correct in assuming thatFig. 7 should appear looped like "afigure eight" or a diagonal line if sine -wave signals are applied to both thescope's horizontal and vertical inputsand one signal is twice the frequencyof the other. However, since we areinstead comparing a decaying sine-wave with a sinewave, the waveformshown in Fig. 7 results.
Although not very noticeable, somedecay is apparent in Fig. 21, just as itis in Fig. 20 (corrected). The difficultyin observing the decay results from theincreased Q factor of the dual -tunedcircuit and not a distortion of the sig-nal generator's sinewave output. Al-though not shown in the article, theEICO signal generator has a wellformed sinewave output.
Signals of the same frequency wereapplied to the scope's horizontal andvertical inputs for producing the pat-tern shown in Fig. 22, 23, and 24. Youare correct in indicating that Fig. 22shows a 90° phase relationship whilethe slanting ovals represent other phaseangles. These phase angles are alsocovered in this month's article, "FMStereo Alignment," which begins onpage 38 and will be covered in futureissues. Ed.
1Ry5.1.4n
The extra charge is for listening to your hus-band tell me how to do the job.. . . for more details circle 119 on Reader Service Card
24 ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
When you need
a Sprague component "yesterday"
and our distributor
doesn't have it in stock...
...ask him to use this form!Upon arriving at our factory, the orderwill bypass normal order entry procedures,assuring same -day shipment by air, UPS,or first-class mail, as distance dictates.
Now there's no need to waste time "shopping" for anexact replacement. Any Sprague distributor can getany factory stock item on its way in 24 hours!
THE BROAD -LINE PRODUCER OF ELECTRONIC PARTS
SPRAGUE®THE MARK OF RELIABILITY
Sp sssss ' snd 0 me riglitered Ifedatilerkt el the Spoivo Cloctric Co.
. . . for more details circle 125 on Reader Service Card
FEBRUARY 1971, ELECTRONIC TECHNICIAN/ DEALER 25
READERS' AID
I will sell my service and lab equip-ment which consists of scopes, signalgenerators, meters, UHF generatorand convertors, tube tester, over 300tubes and many other items at very
reasonable prices. All in A-1 condition.Also 1 have a collector's item for
sale-RCA's first all electric radiowith matching speaker in a wood, ta-ble model cabinet. It uses a neutrodynccircuit with UV226, 227 and 41 tubes.
SAMUEL H. MILLER1104 Hellerman StreetPhiladelphia, Pa. 19111
Asoit wiTEAIStEV FOCUS TIMMG14.4.smmaxAmM.,X.R.
EVN
TItv
Ert
LAMA
cts,or4 n.AolaEL 1400
4t ES1
4 11, PDSITKAIPULL SUMAC
O 1111. 02
20 alvAMASIE 'KR CAIN
SWEEP TIM`E/CM
40,220
SO At,
ili10 LEVELSTAIBILIEV
.V INPUT
B&KPrecision
Model 1460Triggered
Sweep Scope$389.95
B &K Precision's new 1460 Triggered Sweep Scope...the one that's been worth waiting for.
You won't believe how easy it is to sync TV -V and TV -Hsignals until you've actually tried it.
Trouble shooting complex TV cir-cuits takes enough time without hav-ing to fiddle with dials and controlsto adjust to the proper wave form.
That's why the new B&K TriggeredSweep Scope features the TV -H andTV -V positions. These are the two newpositions you've always needed forquick one -knob selection of horizon-tal or vertical TV signals. Exclusivesync separator circuit. No compli-cated and time-consuming adjust-ments . . . just flick a single knob.
Fully automatic triggered sweeplets you view the entire complex TVsignal or any part of it. Including theVITS (vertical interval test signal).
And the "back porch" of the horizon-tal sync pulse, with color burst in-formation. All locked in rock steady.
All solid state with 6 FETS. Runscoolest. Vertical sensitivity (10mV/cm) and writing speed of 0.1 micro-second/cm (using 5X multiplier). Fea-tures usually found in expensive labscopes. Complete with direct/10 to 1probe. 19 sweep speeds and 11 volt-age calibrated ranges, DC to 10 MI -12.
Pinpoint your problems quickly andaccurately with the new 1460 Trig-gered Sweep Scope. The only thingyou'll have to adjust to is having moretime on your hands. Ask your dis-tributor or write for our free catalog.
There is a difference in test equipment-ours works!
Product of DYNASCAN CORPORATION1801 W. Belle Plaine / Chicago, Illinois 60613
. . . for more details circle 102 on Reader Service Card
I am looking for the schematic ofan organ manufactured by the Min -shall Estey Organ, Inc., Brattleboro,Vt., Organ Model H. I was informedthat the company had moved by thereturned letter that I had mailed them.Does anyone have any informationconcerning where I may purchase theschematic?
GEORGE OLSENGeorge Olsen TV13519 Westwind DriveSilver Spring, Md. 20904
I have for sale a set of John F.Riders Radio Perpetual TroubleShooter's Manuals, Vol. I through Vol.XV in good condition. I will sell theseby the set or by each volume at $3.50.
RUSSELL G. SPLAR1425 Lincoln WaySan Francisco, Calif. 94122
I am in need of two WestinghouseIC's. Westinghouse will sell them onlyin lots of a thousand. Does anyonehave two WC183T's they would partwith at a reasonable price?
R. IWASYK12601 Regina LanePalos Park, 111. 60464
I am in need of the schematic andinstruction book for the TV fieldstrength meter, Model A-460, made byApproved Electronics InstrumentCorp., New York, N.Y. I understandthis company is not in business any-more.
CHARLES C. ASMUS, JR.2016 Rockingham Road, Apt. 1
Davenport, Iowa 52802
I have for sale the following instru-ments: transistor checker, tube tester,genometer and high -voltage probes.Operating instructions and schematicssupplied with each instrument. All in-struments are in good condition.
LAWRENCE GARRISONP.O. Box 59Wallburg, N.C. 27373
I need help. I have a 27 -in. MuntzTV set, Model 2763-A, for which Ineed a horizontal output transformer.The part number of this unit is TO-0036. I cannot locate one in my areaand there seems to be no substitute.Any assistance in this will be greatlyappreciated.
RICHARD F. PENZOTTI1901 EmbarcaderoPalo Alto, Calif. 94303
26 ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
How Can You Make 4 Good Product Setter ---
Without Changing 10
Simple - - - Just take a winner likeBLUE SHOWER that comes in abench size can for bench jobs andput it in a caddy size can for housecalls.
Many of our technician friends thatuse BLUE SHOWER in the shophave wanted a smaller package tocarry in a caddy for use on housecalls - - - not only to clean con-taminated tuners but also to cleandust from high voltage cages andother components that need to bespotless in order to function best.
So now BLUE SHOWERcomes in two sizes -No. 1657-121 12 ozs. for $1.99No. 1657-291 29 ozs. for $3.25
TECH
OWE r /7,9110WO
/7,
FOR rpy RS
CLEANS//DEGREASESI RESTORES/
0A14SHOWER CLEANS ,0401.11
LIS THE TUNER .'"'MSG IT FROM THE
S4
4'"a
v,e ;11 -14,,Gitentrated clearly, ortfPenetrates gliaPoli 14
!jetvrr r to dissolve ao4"'ut; -` 9reose and oxidisedr; bockfr "oilers that have
PAS" MOUE SAFE r406001RA0 WILL ii401N6
1. CLEANING ANDyi
ffFORio
1112.7//lifeWEn
7_4/1 44015s DEGREASES
/e4d.e.. E ESTORES
143Vsell CLEANS AND1464,71,4,. le,Thr:Intollfran Woo
eteonfr 1"
*I to irtriotv4.esnil
. f1711:;rem.) owd
,,.
of km.
iLtfS."--;APR 01,11Zits ; Wlll 14°Tnitaviel°
---") CLEANING OHO ruffPMtf4ikiliS Pi4MOUS
Either way its the best way to flush out tuners
and restore them to like new condition.
SPRAY makers of better chemical tools for techniciansP. 0. Box 949 Amarillo, Texas Canada: Win. Cohen, Montreal Export: Empire Exporters, N.Y.C.
. . . for more details circle 126 on Reader Service Card
FEBRUARY 1971, ELECTRONIC TECHNICIAN/ DEALER 127
the most practicalservice tool
everdevised
1.11,11t V.J1.1)
powip MONITORWIRE
Ac 0111140
PM157 '69.50 0111frofrs
A IT IS A ZERO TO 1150WATT WATTMETER
B
You will know whether or notyou are dissipating too muchpower before you start changingexpensive parts.
LINE VOLTS
IT IS AN AC LINEVOLTAGE MONITOR
Calibrated right on the nose at115 volts. How many times hasyour trouble simply been linevoltage and you could have savedso much time?
slPE
Op(4..
Jc CD I=k
POWER MONITORHeretime
C
D
E
is an instrument that will pay for itself insaved the first month you use it.
IT IS AN AC AMMETERTO DETERMINE HOWMUCH LINE CURRENT ISBEING DRAWN
Up to 10 amps. A good check onfuses and other line protectors.How do you know that a circuitbreaker is really bad?
IT IS A FUSE RESISTORCHECKER WITHSPECIAL SCALESFOR EACH FUSE RESISTOR
You will know whether or notyou are sending back a TV orradio set with an overloaded fuseresistor that will go out withinhours.
IT IS PROTECTEDBY A 10 AMPERECIRCUIT BREAKERFully protected against shockhazard to appliance being tested.and is also safe for the operator.8" x 6" x 5" 5 lbs.
1\1 1=t3200 SENCDRE DRIVE_. FALLS, SOUTH DAKOTA 57107
... for nore details circle 123 on Reader Service C3rd28 ELECTRONIC TECHNICIAN DEALER, FEBRUARY 1971
The replacement picture tubeno other color tube
can replace!
cllkNllSimulated TV picture
Now you can install the revolutionary Chromacolorpicture tube in almost any brand of 23" (diag.) colorTV. And let your customer see the difference: a new,sharper Chromacolor picture with greater brilliance,contrast and color definition.
Zenith pioneered, developed and patented (U.S.Patent No. 3146368) the Chromacolor picture tube.And only Zenith has Chromacolor.
Chromacolor is an easy sale because people al-ready know of Chromacolor's superiority. (Last year,after the revolutionary new Chromacolor system was
TWO-YEAR WARRANTYZenith Radio Corporation warrants the replace-ment CHROMACOLOR picture tube to be freefrom defects in material arising from normalusage for two years from date of original con-sumer purchase. Warranty covers replacementor repair of picture tube, through any authorizedZenith dealer; transportation, labor and servicecharges are the obligation of the owner.
AAVAAC Ft®
introduced, Zenith giant -screen color TV sets becamethe No. 1 best-seller!)
Full two-year warranty.Here's your sales clincher: Chromacolor replacementcolor tubes are warran-ed for two full years. Exactlydouble the warranty period for most other replace-ment color picture tubes.
Give your customers the best - Chromacolor re-placement color tubes. Only your Zenith Distributorhas them.
Zenith Chromacolor picture tubepinpoints the color dots on ajet black background and for thefirst time fully illuminates every dot.
The quality goes inbefore the name goes on
FEBRUARY 1971. ELECTRONIC TECHNICIAN/DEALER 29
NEW AND NOTEWORTHYFor additional information on products described in this section, circle the numbers onReader Service Card. Requests will be handled promptly.
Oil
(10)40 CA) NOM 0 "
OSCILLOSCOPE 700
Controls are groupedon panel by function
A Model 556A Oscilloscope is designed so that thecontrols are grouped on the front panel by functionfor more convenient use. The vertical amplifier isreportedly ac/dc coupled and fully compensated foroptimum response with a sensitivity of 20mv/cmover a dc to I.5M Hz bandwidth. Specifications indicatethat the instrument has a sweep frequency of from10Hz to 100kHz in four ranges and is continuouslyvariable in the respective ranges. The scope featuressolid-state circuitry and a compact chassis measuring61/4 in. W by 101/2 in. H by 173/4 in. D and weighing183/4 lb. Price $239. Kikusui Electronics.
TAPE DECK 701Features three motors and threeheads for quality recordings
The three -motor, three -head stereo tape deck, Model640, is said to incorporate many of the features foundin the more expensive models. These reportedlyinclude a record equalization selector switch, whichoptimizes performance with both standard tape andlow -noise high -output tape; a die-cast tape guide andhead black mounting frame for permanent alignmentof critical transport components; plus front panelsound -on -sound, echo controls, and microphone andline mixing. The tape deck is said to also featuremechanical memory capability, which permits timer -activated recording, playback and shut-off, andpositive -acting lever -type transport controls.Price $369.95. Superscope.
AM/FM TUNER 702Slips into all automotive 4 -
and 8 -track cartridge players
A new cartridge AM/ FM and FM -multiplex tuner, Model 30-3075 hasbeen designed for automotive stereo tape players. The unit will reportedlyslip into the cartridge loading slot of all automotive 4- and 8 -track tapecartridge players. It is powered by an internal 9v battery and slidesinto the cartridge slot, after being connected to the car's external radioantenna. A special antenna adapter connector is said to be included, whichcan be permanently left in the car's antenna line. A slide switch on topof the unit selects AM or FM modes. Price $45. GC Electronics.
FOR MORE NEW PRODUCTS SEE PAGE 56
30 ELECTRONIC TECHNICIAN DEALER, FEBRUARY 1971
NO
VH
F
All P
rices Subject to C
hange
$12.05
$18.35
$26.40
VH
F S
TR
ON
GV
HF
- MO
DE
RA
TE
VH
F W
EA
KV
HF
VE
RY
WE
AK
70-V11
$26.95
70-12B
$44.95
70-18B
$62.95
70-V17
$39.95
70-18A
$56.95
70-18B
$62.95
70-18B
$62.95
70-V14
$34.95
70-V20
$49.95
70-23A
$73.95
70-23B
$80.95
70-23B
$80.95
70-23A
$73.95
70-29B
$100.00
70-29B
$100.00
70-V28
$74.95
NO
TE
: Each m
odel above is also available with 75 ohm
coaxial cable downlead and com
pact behind -the -set balun-splitter tom
atch antenna system to proper set term
inals.
NwI-
(r)
(i)ri)wCC
Parts -time help
a full-timeservicefrom yourCentralabdistributor
DISTRIBUTOR PRODUCTS
CENTRALABElectronics DivisionGLOBE -UNION INC.
5757 NORTH GREEN BAY AVENUEMILWAUKEE. WISCONSIN 53201
Time. It's the only way you can make your repairskills available to customers. So, the better use youmake of it, the better your profit potential. That'swhere we can help. At parts time.
More than 1,000 Centralab distributors nationwidespecialize in stocking the exact replacement compo-nents you need. And putting them in your hands fast.
Whether it's for color or black and white TV,hi-fi, stereo or radio . . . all Centralab replacementparts feature the reliability you can depend on. Ourbroad line includes 1/2 watt carbon, Fastatch® II, 3watt wirewound controls, and miniature trimmerresistors. Plus capacitors: discs, electrolytics, poly-styrenes, and Gap -Caps®. Also, a wide variety ofPEG' packaged electronic circuits, and fire retardantpush-pull line switches. To name just a few.
A complete listing of the replacement parts avail-able from your nearby Centralab distributor can befound in Photofact,® Counterfact® and the. Replace-ment Control Guide. Or, ask us to send you aCentralab replacement parts catalog.
DS -7105
... 'or more details circle 105 on Reader Service Card
32 ELECTRONIC TECHNICIAN DEALER, FEBRUARY :971
ELECTRONIC TECHNICIAN DEALER FEBRUARY 1971
TEKLAB REPORT
The receiver's vertical feedback circuit,
known as a Miller run-down circuit, was seldom
employed before the advent of transistors,
due to its high gain requirements
Introducing RCA's ArgosyPortable Color -TV Set -Part II
Most of the repairs that mighteventually be required for this chas-sis can be accomplished by modulereplacement rather than by replacingsingle defective components. How-ever, it is still important to knowhow each circuit functions for moreeffective servicing or possible mod-ule repair.
Last month's Teklab Report re-viewed the RF, IF, AGC, NoiseControl, Video and Kine Driver cir-cuits, while this month we cover thepower supply, and horizontal andvertical deflection circuits, which inmany ways are different from com-parable circuits in earlier RCA re-ceivers. The complete schematic forthis RCA CTC49 chassis can befound in the February Tekfax, Sche-matic No. 1342.
Power SupplyAlthough the power supply utiliz-
es a transformer, one side of the acline is connected to the chassis. Itsdc outputs and their principal usesare as follows: The 220v source powers the kine
drivers, Modules MAD. A half -wave rectifier and an RC -pi cir-cuit are used in supplying thisfiltered voltage.
Four diodes in a bridge configu-ration provide two additionalpower sources. One of these, us-
ing capacitive filtering, suppliesabout 77v to the vertical -outputtransistors. The second is dividedinto separate supplies-one forthe low-level transistors usedthroughout the receiver, the otherfor the audio system. Both arenominally 30v sources and bothuse RC -pi filters.
A half -wave rectifier, with anLC -pi filter, is used to supply160v to the horizontal deflectionsystem.
As illustrated in the schematic di-agram, Fig. 1, the receiver containsa rather unusual degaussing circuit.In this schematic, T 1 01 is the powertransformer (for simplicity severalwindings were deleted from the illus-tration) and S102 is the NORMAL/HIGH line switch. At "turn -on" theresistance of temperature compen-sating thermistor RT1 is low andthe degaussing current is high. Asthermistor RT1 warms, its resist-
VOWER
11
DEGAUSSINGGEI4.fEer,
R4420
NT I
Fig. 1-Simplified schematic of the automaticdegaussing circuit.
ance increases until the degaussingcurrent approaches zero. Afterwarm-up, the voltage drops acrossresistor R4 and thermistor RT I areequal to the voltage drops across theupper and lower transformer wind-ings, respectively; making the volt-age across the degaussing coil equalOv. The current, which still flowsthrough resistor R4 and thermistorRT1, keeps the latter warm to main-tain its high resistance.
Horizontal Deflection CircuitsThe CTC49 chassis employs a
horizontal deflection and high volt-age system similar to the one em-ployed in the CTC47 chassis, whichwas derived from the circuits in theCTC40 chassis. However, becauseof the wider CRT deflection angleused in the CTC49 chassis, a moresophisticated means of correction isnecessary to overcome side pin-cushion, the horizontal scan mustbe increased when vertical scan isnear the center of the raster. Inearlier RCA color -TV sets, thiscorrection was accomplished by pas-sive components. Since the high -voltage regulator of this chassis alsocontrols the scan width, side pin -cushioning may be corrected by pro-viding a second input to the regula-tor. This input is derived from thevertical deflection circuits and proc-
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 33
T401HV Transformer
0101Vertical Output Transistor
-0102Vertical Output Transistor
SCR 102Commutating Rectifier
SOM 101- High Voltage Quadrupler
SCR 101Trace Rectifier
Rear view of chassis showing components employed in the horizontal and vertical sweep circuitsof the RCA CTC49 color chassis.
essed by the circuit shown in Fig. 2.To correct side pincushioning, it
is only necessary to increase the for-ward bias of transistor Q402 whenvertical scan is near the center of theraster and decrease it when the ver-tical scan is near the top and bot-tom. One output from the verticaldeflection system is fed to the baseof transistor Q402 by way of resis-tors R416 and R415 while anotherarrives through resistor R417. Thesesamples of vertical deflection signalare shaped into a parabolic wave-form which reaches its maximumpositive potential at vertical mid-scan.
Two additional inputs from thehorizontal deflection system are usedto optimize this high -voltage regula-tion and pincushion correction. Thefirst of these is obtained from ter-minal D (Fig. 3) of the high -voltagequadrupler through resistor R115,and reaches the base of transistor0402 by way of resistors R426 andR419. It allows the regulator systemto "measure" the beam current andmore accurately regulate the highvoltage.
The second input is obtained fromterminal C of the quadrupler andreaches the base of transistor Q402by way of potentiometer R428. Thisinput samples the high voltage bymeans of the capacitive voltage di-vider, made up of capacitor C426and the capacitors in the quadrupler.It compensates for phase shift of theside pincushion correction voltage,
which is the result of the capacitanceof the kinescope ultor (secondanode) connection.
The amount of effect which thissample from the quadrupler willhave on the pincushion amplifiermay be adjusted with potentiometerR428. The amplifier has been de-signed so that when brightness is setfor a barely visible raster and poten-tiometer R428 is set to minimum(CCW) there will be no pincushion.Potentiometer R428 is then adjustedto correct the pincushioning, whichwill appear when the brightness isincreased to maximum.
Unlike conventional high -voltagepower supplies, which rectify a posi-tive pulse from the flyback trans-former with a half -wave rectifier, theCTC49 chassis uses a solid-statequadrupler to produce high voltage.This reduces the required pulse am-plitude from about 23kv to normal-ly 6kv. The quadrupler itself is her-metically sealed and is not repair-able.
Vertical Deflection CircuitsThe vertical feedback circuit em-
ployed in the CTC49 chassis isknown as a "Miller run-down cir-cuit." This circuit was seldom useduntil the advent of transistors be-cause of its high gain requirements.The Miller run-down circuit multi-plies the changing capacitance by afactor equal to the gain of the ampli-fiers without feedback, resulting ina very linear output. Many of the
variations in supply voltage, ampli-fier gain, etc., which would drasti-cally change the output of a conven-tional vertical -deflection circuit,would have very little effect in theMiller circuit because of the largedegenerative feedback.
A schematic of the RCA CTC49chassis vertical -output stage isshown in Fig. 4 with a simplifiedyoke circuit. The circuit configura-tion is similar to a high -quality audioamplifier. The yoke itself is analo-gous to a speaker voice coil, capac-itor C419 to the coupling capacitor,and R, equivalent to the total re-sistance of the yoke and convergencecircuits. The value of capacitorC419 has been chosen to providemaximum energy transfer at thevertical scanning frequency. Feed-back to the Miller capacitor is de-veloped across resistor R13, and ca-pacitor C10 is a filter.
During retrace, transistor Q3 iscut off, allowing its collector voltageto increase towards B+. The 65vzener diode, CR4, limits the maxi-mum base bias of transistor Q101,serving to limit yoke retrace current.During scanning time, the bases oftransistors 0101 and 0102 aredriven progressively less positive ata linear rate. Conduction is throughtransistor Q101 during most of theretrace time and as the scan passesfrom the top to the center of the ras-ter. The voltage across capacitorC419 reaches its maximum at thecenter of vertical scan (90° out ofphase with the current), and duringthe lower half of the scan capacitorC419 discharges back through theyoke and transistor Q102. This cur-rent increases at a linear rate, sincethe forward bias on the base of tran-sistor 0102 is also increasing at alinear rate.
The diode connected between thebases of transistors Q101 and 0102improves the switching characteris-tics of the transistors at mid-scan.Transistor Q102 has no bias as longas transistor Q101 is conducting.Therefore, only slight voltage swingsare necessary to cut off transistorQ101 and turn on transistor Q102at the center of the raster. If the di-ode were shorted or bypassed, re-verse bias would exist between thebase and emitter of transistor Q102while transistor Q101 was conduct-
34 I ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
VERTOUTPUT
V4- C419
470,,F
CONV
BOARD
BRIGHTLIMITER R115
4 IHV OUAD-o--1\A.7KAr--.ITERM 0
HV QUADTERM C
VERT
YOKE
C109.01
R426
330K
C4200082
R419330K
I C306 _L c421.01
_l_I .15=C426 R428
C42C
1 MEG.01
1
PINADJUST
CURRENTTOP HALF
OF RASTER
R41682K
R415
68K
R414
100K
R417
82K
J_33
R13 R413
(MAG) 82K2.2
HV ADJUSTR411
C4' 7
7 33
0402
R412
270
CR405
C415T 5.8 ,F
T402
0401CR404
Fig. 2-Diagram of the side pincushion amplifier circuit. The high voltage regu ator also ontrols the scan width. The side pincushioning is correctedconveniently by providing a second input to the regulator.
BRIGHTNESSLIMITER
VERTICALPRE DRIVER
FOCUS DIVIDER
SIDE PIN ADJUST (R428)
SIDE PIN AMP
ing, and consequently there wouldbe appreciably more disturbance inthe circuit during the transition time.This probably would be sufficient toproduce a white horizontal line atthe center of the raster.
Connected between the two verti-cal yoke windings is the top and bot-tom pincushion circuit (Fig. 5),which is similar to the ones used inmany other RCA color receivers.Horizontal yoke current passingthrough the primary of the Top/Bottom pincushion transformer,T404, excites a tuned circuit which
CR465V
20 I kV1120 LINE
IOW* ZERO BEAMI
F. 3-The solid-state High -Voltage Quadrupler (at left) producesthe high voltage. It is hermet cally sealed and not repairable.
77
R16330
R'71530
CR5 C1110.F
it
Fig. 4-Schematic of the vertical -output stagewith a simplified yoke circuit.
0101
C419470pF
03
0102
R2211.5 T
FEEDBACK
=. TO SWITCH =_L
Ry
C10
YOKE
R13
2.2
FEEDBACK TOMILLER CAP
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 35
VERTICALBLANKING
CURRENTTOP HALFOF RASTER C419
470p F
+ 77
VERTSYNC
0101
SIDE PINAMPLIFIER
TOP R.G VERTTO CONY
_ivtw., CIRCUITS
R801 R810
10 1.2
R80210
TO CONYCIRCUITS
IswBOT RG VERT
0102
VERTHOLD
VERTICAL SWITCH
AND DRIVERS
R2211.5
4
5
8
6
VERT- YOKE C110
- .027
T404 PINPHASEPIN
T;BAMPLITUDE8K
PIN
C418,_ ---d1J-L9a5
.056T
CURRENTTOP HALFOF RASTER
R13 IC10
H DEF H YOKE
R121100
C407.39
R422330
R120100
2.2 18p Fes. SIDE PIN
AMPLIFIER
Fig. 5-Yoke circuit of the RCA CTC49 color chassis.
consists of the pincushion phase coiland capacitor C418, which is in se-ries with the vertical yoke.
Depending on its phase, this15.73kHz voltage may either buckor boost the vertical deflection. Thecore in the pincushion coil is ad-justed so that vertical -yoke currentis decreased at the edges of the ras-ter and increased at the vertical cen-terline. The 8K potentiometer con-trols the amount of yoke currentbuck and boost, so that the inherentpincushioning is cancelled.
Passing through the second yokewinding, terminals 8 to 6, the yokecurrent reaches ground through re-sistor R13. The voltage at the junc-tion of resistor R13 and the yoke ispositive during the top half of scanand negative during the bottom half.This voltage is fed to the verticalamplifier through the Miller feed-back loop and also to the side pin-cushion amplifier, where it is usedfor wave shaping.
The components of the predriverstage are physically located in anumber of places in the instrument;locations may be determined by thesymbol numbers. Component sym-bols of one or two digits (C9 and
R11, for instance) are in ModuleMAG. The 200-, 300-, and 400 -se-ries symbols indicate locations onboards PW 200, PW 300, and PW400, respectively.
When comparing the vertical pre -driver circuit in Fig. 6 to the simpli-fied circuit in Fig. 7, we see thattransistors 01 and Q2 have thesame functions in each diagram, andcapacitor C 1 of Fig. 7 is analogousto capacitor C7 of Fig. 6. ResistorR2 of Fig. 7 is replaced by resistorR8, plus a number of other compo-nents also included between the baseof transistor Q2 and B+.
In understanding the functions ofthese additional components, re-member that anything which in-creases the positive voltage at thejunction of resistors R8 and R203Awill increase the raster height. Con-sider first the major voltage sourceto resistor R8, consisting of resistorsR203A and R217. As the value ofresistor R203A is decreased, heightwill increase. If the setup switch,S201, is closed to the service posi-tion, the voltage applied to resistorR8 is diminished to practically Ov,collapsing the raster.
Because transistor Q102 is cut off
while the top half of the raster isscanned, the voltage at its collectoris Ov until the vertical scan reachesits center. During the bottom half ofscan, the collector current of tran-sistor Q102 increases linearly, sothat the voltage fed back to resistorR8 tends to "stretch" the lower partof the raster, to overcome a tenden-cy towards bottom compression.Feedback to the vertical -switchtransistor also is derived from resis-tor R221.
The remaining input to resistorR8 comes from the horizontal sys-tem. As the high -voltage return cur-rent from the quadrupler to thebrightness limiter increases or de-creases, the voltage at the junctionof resistors R426 and R320 also va-ries. An increase in kine current re-duces the voltage to the height con-trol, causing a slight decrease in ver-tical deflection. This causes scanningheight to track scanning width.
The most important feedback sig-nal in the system is fed to capacitorC7 from the junction of resistor R13and the yoke. Ignoring the effect ofcapacitor C10, the voltage at thispoint reaches its maximum positivevalue at the beginning of scan, pass -
36 ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
0102
R426H V QUAD 4.7K
D RETURN
.01
R2211.5
+15REG
R31910K
R3204.7K
CURRENT I C306BOTTOM HALF T .01OF RASTER
R22047K
C4194701.1F
CONVBOARD
PINCUSHION
CIRCUIT
CURRENTTOP HALF
OF RASTERR132.2
C209
T1000R1268K
YOKE
\
PC,
C10180 F
TO BRIGHTNESSam- LIMITER
RT1
R2192.2MEG
VERTHOLD
R11100K
®CR3
®CR2
R218680K
C6 -.01 I
C8
R1056K
C7.47
+15 REG
R21712K
R0
R203A50K
HEIGHT
R882K
02
0
S201
R1568K
01 =SWITCH
R1422K
+77
TO DRIVERaw- (03 BASE)
R95.6K
Fig. 6-The Vertical Predriver Circuit with its inputs.
es through Ov, and reaches its maxi-mum negative value just before ver-tical retrace. Therefore, the feed-back to transistor Q2 is degenerative,since the voltage at the base of tran-sistor Q2 tends to rise throughoutthe scanning interval. Capacitor C10is used to filter out any horizontal -deflection voltage present.
The switch transistor Q1, and itscircuit (Fig. 7), perform three func-tions-it controls the free -runningfriguency of the vertical deflectionsystem, allows synchronization withthe received signal and determinesthe duration of vertical retrace.
Information used in this article isbased on material supplied throughthe courtesy of RCA Sales Corp.
SYNCPULSE
_ J
YOKE
Fig. 7-A simplified Vertical Deflection Circuit.
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER j 37
FM Stereo Alignmentby Phillip Dahlen
Simple techniques for peaking a high -quality receive'
Recently a Minnesota representa-tive of Sound Technology broughttheir Model 1000A FM alignmentgenerator to Duluth to be evaluatedby both the ELECTRONIC TECHNI-CIAN/DEALER lab and Mel's TV, amajor dealer in town. Working inconjunction with Dennis Ford, anelectronic technician at Mcl's. we
used this instrument to supply thedesired frequency -modulated (FM)signal to the antenna terminals of aFisher 500 receiver, observing theresulting waveforms on a Telequip-ment Type D54 dual -trace scope(Fig. 1).
Five test leads were required forthe hookup (Fig. 2). These were
Fig. 1-Receiver and instruments used for observing FM characteristic waveforms.
SOUND TECHNOLOGY
MODEL 1000A
FM GENERATOR
00 0 0o
0 0 0 0
0
TELEQUIPMENT TYPE D54
DUAL -TRACE SCOPE
DUALVERTICAL
INPUTS
FISHER 500
r0
j---HORIZONTALINPUT
RECEIVER (REAR VIEW)
FM ANTENNA
RECEIVER AUDIO OUTPUT -RG 58A/U (50II)
ANTENNA MATCHING NETWORK
Fig. 2-Arrangement of test leads for connecting receiver and test instruments.
run between the generator's RF out-put and the receiver's antenna ter-minal, between one of the receiver'saudio output channels and the gen-erator's receiver terminal, betweenthe generator's vertical output andone of the scope's vertical inputs,between the receiver's other audiooutput channel and the scope's sec-ond vertical input, and between thegenerator's horizontal output andthe scope's horizontal input.
Unlike amplitude -modulated( AM ) signals, where the audio sig-nal is transmitted by varying thestrength of the carrier frequency,FM signals are transmitted by vary-ing the frequency of the carrier wavein response to the amplitude of theaudio signal-the rate at which thecarrier frequency changes corre-sponding to the frequency of the au-dio signal. The stronger the audiosignal being transmitted, the greaterthe change in carrier frequency.
The signal generator producesboth 60Hz and 10kHz signals, whichare frequency modulated upon theinstrument's RF signal. The oscilla-tor control (Fig. 3) determines theamplitude of the 10kHz signal in re-
the 60Hz signal, while thesweep width control determines theamplitude of the more predominant60Hz signal, and as a result therange of frequencies that the RF sig-nal must cover as it is modulated.The level of the 19kHz pilot signal,used as a reference for separatingthe stereo channels, can also be con-trolled on the instrument-the testbutton on the instrument permittingthe meter to measure the strength ofthis pilot signal rather than measur-ing the sweep width. The remaininglevel control determines the amountof RF signal voltage applied to thereceiver, permitting a measurement
Fig. 3-Sound Technology's 1000A FM Align-ment Generator.
38 ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
of the receiver's effective sensitivity.In addition to these level controls,
the instrument has controls for de-termining the carrier frequency(some receivers are more sensitiveat one end of the tuning dial than atthe other), how this frequency ismodulated (whether it is merely acarrier signal or contains a monauralsignal, a stereo signal or an SCA67kHz subcarrier signal, and the re-sulting RF waveform), and what au-dio signals are used (whether an ex-ternal left and right channel signal issubstituted for the 10kHz signal,whether only the left or right chan-nel audio signal is transmitted, orwhether a left minus right channel orright minus left channel stereo signalis transmitted).
Besides the four test -lead termi-nals shown connected in Fig. 2, thetwo left terminals on the instrumentare for applying an alternate audiosignal to be transmitted in place ofthe 10kHz signal, the third terminalcan provide a 19kHz signal, thefourth terminal can provide a 10kHzsignal, and the last terminal canprovide a composite audio signal.
So much for virtually all of thecontrols and connections, butwhat can they be used to show?
When the generator applies aRF signal to the receiver
(Fisher's rating for the receiver'ssensitivity), the lower scope trace(obtained directly from the receiv-er) forms a straight diagonal line(Fig. 4)-its output voltage going
Fig. 4-Scope traces that resulted when a1.70 RF signal, sweeping 150kHz, was appliedto the receiver. (Upper trace is 10kHz signalobtained through generator while lower trace is60Hz signal obtained directly from receiver.)
up as the sweep frequency rises. Asmall ripple may be seen on thislower scope trace. It represents thesuperimposed 10kHz audio signal.
In the two previous articles de-scribing RF signals ("Tuned CircuitSignals," Parts I and II), we stressedthe fact that there are occasionswhen it is necessary to apply a sinewave to a scope for its horizontaltrace rather than using the scope'sinternal horizontal sweep signal (asaw-toothed wave). The scope tracesshown in Fig. 4 (plus many of theother scope traces shown in this ar-ticle) resulted from using a 60Hzsine wave, obtained from the gener-ator, as the horizontal sweep signal.The phase control on the generatoris adjusted so that the 60Hz verticalsignal obtained from the receiverand the 60Hz scope sweep signal ob-tained from the generator are atsuch a phase angle that a diagonalline is formed. (In Fig. 22, 23 and24 on pages 52 and 53 of the Octo-ber 1970 issue we saw that whensine waves of the same frequencyare applied to the horizontal andvertical inputs of a scope, a patternforms that can look like either anoval or a circle-depending on thephase relationship between the twoapplied signals. The phase anglescan be further shifted so that a diag-onal oval, such as that shown in Fig.24, will flatten out more and form adiagonal line-as seen in the lowertrace in Fig. 4 of this article.)
As had been previously indicated,the more positive portion of the60Hz sine wave (the higher voltageportion) is seen at the right side ofthe screen, while the less positiveportion of this sine wave (the lowervoltage portion) is seen at the leftside of the screen. As the 60Hz sine -wave voltage becomes greater, themodulated radio frequency becomesgreater; while as the voltage formingthe 60Hz signal becomes less, themodulated radio frequency becomesless.
The 60Hz signal obtained fromthe receiver's other audio channel isfiltered out in the generator cabinet,leaving only the 10kHz signal to ap-pear as the upper trace on the scope(Fig. 4). This 10kHz signal, whichin the receiver had been riding onthe more predominant 60Hz signal,is also produced by FM variationsof the RF signal. Since the 10kHzsignal is not nearly as strong as the60Hz signal, its corresponding acvoltage does not produce significant
frequency shifts of the RF signal (itis the amplitude of the ac signal volt-age that determines the range of fre-quencies that the RF signal sweepsand not the frequency of the audiosignal). Therefore, the left portionof the upper scope trace shows the10kHz signal as it is produced byvariations of lower -frequency radiosignals, while the right portion ofthis trace shows the 10kHz signal asit is produced by variations of high-er -frequency radio signals.
In other words, the 10kHz signal,shown as the top scope trace, is pro-duced by FM variations of an RFsignal which is changing in frequen-cy-sweeping a larger frequencyrange than that required to producethis signal. The 10kHz signal shownin the left portion of the screen isproduced by a lower radio frequencythan the 10kHz signal shown in theright portion of the scope screen.
In this instance the amplitude ofthe predominant 60Hz modulatingsignal present in the generator re-sulted in a 150kHz sweep of the RFsignal. This is about as wide a radiofrequency range as the receivercould handle with the current RFinput voltage and the present adjust-ment of its IF and discriminatortuned circuits. Note how a veryslight trace of noise is apparent ateither end of the two scope traces.
These same general principlesapply to most of the remainingscope traces.
When increasing the amplitude ofthe generator's internal 60Hz modu-lating signal so that the RF signalsweeps a 300kHz frequency range,the receiver is unable to handle solarge an RF fluctuation and a distort-ed 60Hz waveform is produced at itsaudio output-noise appearing at
Fig. 5-Scope traces that resulted when a
3.O/Lv RF signal, sweeping 300kHz, was appliedto the receiver.
FEBRUARY 197:, ELECTRONIC TECHNICIAN/DEALER 39
the left and right ends of the lowerscope trace (Fig. 5) rather than anextended horizontal line representingpeak maximum and minimum 60Hzvoltages.
Under these same conditions, thereceiver is also unable to receive the10kHz signal carried by the higherand lower radio frequencies, andnoise is therefore also apparent ateither end of the upper scope trace.
In addition to increasing the RFsignal sweep to cover 300kHz, weelected to increase the RF signalstrength from 1.7µv to 3.0,uv. Al-though so small an increase was notadequate to help the receiver coverthe entire RF sweep, it did help im-prove the receiver's coverage. By in-creasing this RF voltage to 30,000µvwe were able to cover the entire
Fig. traces that resulted when a30,000,,v RF signal, sweeping 300kHz, was ap-plied to the receiver.
300kHz RF sweep (Fig. 6) with thereceiver.
By adjusting the generator for a100µv RF signal sweeping 600kHz,the receiver distortion (Fig. 7) ap-proximated that previously receivedwith the lower RF signal strengthand narrower sweep width. How-
4......1r. ..t.,.
..,,....4%.Fig. 7-Scope traces that resulted when a
100yv RF signal, sweeping 600kHz, was ap-plied to the receiver.
ever, in this instance increasing theapplied RF signal strength to30,000p,v did not result in the re-ceiver adequately covering the ap-plied FM signal (Fig. 8). (The leftportion of the upper scope trace in-dicates that noise is present at lower
. -211101"
Fig. 8-Scope traces that resulted when a
30,0000 RF signal, sweeping 600kHz, was ap-plied to the receiver.
radio frequencies. The right portionof the lower trace indicates that thereceiver is unable to receive the morepositive portion of the 60Hz sinewave and there is a correspondingloss of 10kHz signal on the rightportion of the upper trace. Noise isapparent near the right end of theupper trace.)
Adjustments such as these can beused to determine a receiver's sensi-tivity, effective RF bandwidth andthe efficiency of its automatic gaincontrol (AGC).
This instrument can also be usedto improve the receiver's IF anddiscriminator circuit alignment.
In Fig. 6 we saw the scope tracesthat resulted when the discriminatorwas properly adjusted and a30,000µv signal was applied havinga 300kHz sweep width. With thediscriminator still properly adjusted.a similar set of scope traces ap-peared when 300µv of RF signalwas applied having a 150kHz sweepwidth. By misadjusting the bottomtuning slug in the receiver's discrim-inator circuit, we obtained the dis-tortion shown in Fig. 9. (For thisand the following illustrations thescope's vertical sensitivity to the
Fig. 9-Distorted scope traces that resultedwhen a 300/iv RF signal, sweeping 150kHz, wasapplied to the receiver and the lower portionof the discriminator circuit was tuned out ofalignment.
10kHz signal voltage was increasedso that we could more readily seehow the strength of this signal wasmade to vary by misadjusting thediscriminator circuit.) As misadjust-ed, the receiver became insensitiveto the lower -frequency radio signals-no 10kHz signal appearing at theleft end of the upper trace and the60Hz signal's peak minimum volt-age being clipped off.
With the bottom discriminatortuning slug readjusted and the topone tuned out of alignment, we ob-
Fig. 10-Distorted scope traces that resultedwhen a 300yv RF signal, sweeping 150kHz, wasapplied to the receiver and the upper portionof the discriminator circuit was tuned out ofalignment.
tained the scope patterns shown inFig. 10. In this instance the receiverwas more sensitive to lower radiofrequencies than higher ones andthere was a stronger 10kHz signalappearing at the left end of the up-per scope trace than in the centralportion or at the right end.
Had the RF sweep width beeneven greater than 300kHz and thediscriminator circuit further de -tuned, we would have seen a greaterincrease in the 10kHz signal at theright end of the upper scope trace,the minimum 10kHz signal ampli-tude appearing near the center ofthis upper scope trace. Even in Fig.10 we can see a slight increase in10kHz signal amplitude at the rightend of the upper scope trace, ascompared to one division to the lefton the scope's gradient.
We did not elect to further mis-adjust this receiver's discriminatorcircuit, but had we done so wewould have seen scope traces similarto those shown in Fig. 11. Such apattern (had it occurred with theprevious scope settings) would haveindicated that the receiver was moresensitive to the higher and lower fre-quencies swept by the RF signal
continued on page 60
40 ' ELECTRONIC TECHNICIAN DEALER. FEBRUARY 1971
Sweep Alignment Pointersby Jim Smith
Although many articles have been written in the past
on how to use a specific sweep generator or how to
align a certain TV chassis, the reasons for the shape
of the IF amplifier response curve and important
related information have generally been lacking. It is
important to know why the response curve is shaped
the way it is and what effects will occur when it is not
shaped properly. Understanding a few basic points
about sweep alignment will make the alignment
of any TV set both faster and easier
The IF amplifier response curveis the most important response curvein a TV set. The shaping of the sig-nal in the IF strip will determine
Fig. 1-Ideal IF amplifier response curve obtained from a TV set.
whether the receiver will pass color,sync in properly, have ghosts orringing in the picture. It is also inthese circuits where the greatest
change will oc-cur as the setages.
An ideal IFamplifier re-sponse curve isshown in Fig. 1.Although it isnot a "text -bookcurve" (as inFig. 2), it doescome very close.Some of the new-er receivers, suchas Zenith have a
45.75
47.25
42.17
41.25 39.75
Fig. 2-"Text-book" type illustration of what an ideal IF amplifier response curve should look like.
rounded or "hay stacked" curve.For most receivers it is best to
have the alignment instructions sothat the actual shape of the curve isknown as well as the location of theadjustments in the receiver. How-ever, when doing alignment work itis best to strive to get as close to theideal curve as possible withoutspending too much time on thealignment. In most cases, coming"close" can result in a fairly goodjob of alignment, but the more align-ment experience gained, the easierit is to approach the ideal curve.
Marker PositionsThe 45.75MHz video carrier sig-
nal should be seen halfway up theleading edge of the response curve.However, this marker position forthat frequency may vary between 40and 50 percent of maximum ampli-tude without affecting the picture. Ifthe marker falls below the 40 per-cent level, some difficulty may beencountered with the sync; while ifit rises above 50 percent, ringing inthe picture, tunable ghosts and apoor picture will result.
If the marker appears as in Fig.3, the slope of the video portion ofthe response curve will not bestraight between the 47.25MHz and45MHz points. The TV set will thenexperience the same difficulties asthose previously mentioned.
The position of the 45MHz pointon the response curve is not criticaland can vary slightly just as long asthe video portion of the curve re-mains horizontal. This point can beeasily found since it will fall on thecurve exactly halfway between the45.75MHz video carrier and the44.25MHz marker. With some ofthe haystacked curves in the newerreceivers, it is normal for the 44.25MHz marker to appear near the topof the curve on the video carrierslope.
There are some cases when the47.25MHz adjacent -sound trap mayhe misaligned without causing anytrouble in the TV set. However, Fig.4 shows a condition in which thetrap can cause poor sync conditionsby reducing the straightness of thevideo slope on the response curve,as well as reducing the low -frequen-cy signals applied to the video de-tector. The alignment of this tap
FEBRUARY 197., ELECTRONIC TECHNICIAN/DEALER 1 41
Fig. 3-A dip at the top of the IF amplifier response curve may resultin ringing in the picture, tunable ghosts and a poor picture.
very critical in TV sets connected tocable systems since they are subjectto interference not normally encoun-tered during the reception of "free -air" signals.
The color slope of the IF ampli-fier response curve is very importantand demands as much attention in acolor -TV set as does the video slope.Fig. 5 shows the positions of the col-or markers as they should normallyappear on the response curve. If the42.67MHz marker is allowed to fallbelow the 20 percent relative ampli-tude limit or is filtered through the41.25MHz sound trap as a result ofmisadjustment, not all of the colorinformation will reach the chromabandpass amplifier, resulting inweak colors on the screen. However,if the 41.67MHz marker rides onthe flat portion of the IF amplifierresponse curve, or above the 80 per-cent point as shown in Fig. 6, thesame trouble may result but with theadditional possibility of ringing or aghost effect in the picture. Slight var-iations in the color slope portion ofthe response curve can be compen-sated for with the chroma bandpassamplifier if the markers are close totheir proper location.
The chroma bandpass amplifierhas an unequal response that is op-posite that of the color slope of theIF amplifier. As a result, the re-sponse curve of signals at the outputof the chroma bandpass amplifier isflat, and information of uniform am-plitude is fed to the color demodu-lators.
Fig. 4-The sound trap can cause poor sync conditions by reducingthe straightness of the video slope on the response curve.
Fig. 5-Relative positions of the color markers as they should normally appear on the responsecurve.
Alignment ProceduresThe traps in a TV set are very
important and should be adjustedbefore any other alignment is per-formed. Generally, the 41.25MHzsound trap is the one that will befound to need a slight touch up.Misalignment of this trap will causesound bars to appear when the pic-ture is properly tuned in, or asmeary picture if the sound is tunedout of the picture. The adjacent -sound trap will upset the slope ofthe video curve and, as explainedpreviously, also cause smear in thepicture.
Alignment of the 41.25MHzsound trap can be made easier bytuning to center the 41.25 markerand setting the scope's sweep widthto about 1.5MHz. In this mannerthe IF amplifier response curve isenlarged and its dip becomes moreapparent for trap adjustment. From
the resulting scope trace, shown inFig. 7, we see the 41.25MHz markerabove the dip caused by the trap.This indicates that the trap is out ofalignment and that in this case thesound signal is not being filtered outas it should.
Fig. 8 shows a chroma bandpassamplifier response curve with the3.08MHz and 4.08MHz markers atequal amplitude. This is the re-sponse curve seen when the sweep -marker signal is injected into the IFtest point in the tuner and the signalis passed through both the IF andchroma bandpass amplifiers. If in-stead the marker -sweep signal is in-jected into the chroma bandpass am-plifiers, as recommended by severalmanufacturers in their older align-ment procedures, the unequal re-sponse curve shown in Fig. 9 willresult. This unequal response of the
42 ELECTRONIC TECHNICIAN DEALER, FEBRUARY 1971
Fig. 6-If the 41.67MHz marker rides above the 8( percent poi it notall of the color information will reach the bandpass amplifier and theremay also be ringing or a ghost effect in the picture.
chroma bandpass amplifier matchesthe unequal response of the colorslope on the IF amplifier responsecurve, as explained earlier. The bestprocedure, which is also recommend-ed by most manufacturers today, isto align the chroma bandpass am-plifiers for a flat output curve whenpassing the sweep -marker signalthrough both the IF amplifier andthe chroma bandpass amplifier-just as the normal color signal wouldhave to pass through both. This re-sults in greater accuracy when align-ing the chroma bandpass amplifier.
There has been some questionconcerning the 4.5MHz sound trapsince many procedures are given foraligning this trap which fail to in-clude any explanation as to what ishappening. The 4.5MHz trap is lo-cated after the video detector andcannot be aligned with the normalIF sweep -marker curve. However.this trap can be aligned by watchingthe chroma bandpass amplifier curveand the 4.5MHz marker; and thenadjusting for a minimum gain fromthe base line of the marker or bywatching the dip as was done whenaligning the traps in the IF responsecurve. This makes it a simple trapto align after learning where it is andwhen to align it.
Conclusion
Sweep alignment is a very impor-tant tool as it can correct the picturein many TV sets that have troubleswhich seem "sort of way out." Butsweep alignment, like anything else,
Fig. 7-The 41.25MHz marker appears above the dip caused by the trap,whi:h indicates that the trap is out of alignment and that in this casethe sound sigral is not being 'iltered out as it should.
8-By fending the sweep -marker sigral through both the IF and chroma bandpass amplifiers,'he 3.08MHz, 3.58MHz and 4.06MHz markers appear to all be of equal amplitude.
'ig. 9-By feeding the sweep -marker signal through onli theequal response curve results. This curve matches the unequal'IF amplifier response curve.
must be practiced if it is to be doneproficiently. With more practice, itcan be done faster, and the customerwill be pleased with a better job.Providing customers with cleanerand sharper pictures will more thanpay for itself in days to come.
chroma bandpass amplifier, an un-response of the color slope on the
FEBRUARY 1971, ELECTRONIC TECHNICIAN/ DEALER 43
GUEST AUTHOR
The Independent Dealer -
Distributor Relationshipby Arthur M. Effron
Keeping this relationship satisfying and viable is not
oily a challenge to the manufacturer's marketingefort but also a daily test of every supplier'sprofessional concern for future market growth.
Although our approach to mar-ket promotion emphasizes a close re-lationship between the independentservice dealers and the distributor,compatibility here is not entirelycontingent on product line, pricingand service. There is another ele-ment that is certainly worthy of
attention-incentives.Sales incentives are used for many
reasons. Among these is the need tohelp remind dealers and distributorsthat they are receiving advertisingand service support, plus high -qual-ity, reliable products that are sup-plied for their customers.
Art Effron makesready a primestaak from one ofthe gift offeringsin GeneralElectric's promo -tic nal program.The author is adistrict salesmanager in LosArgeles for Gener-al Electric'sDistributor SalesOreration, Elec-tronic ComponentsSales Dept.Prior to thisappointment, hewzs manager ofadvertising andsales promotionfr General Elec-tric's Tube Prod-ucts Dept. inOwensboro, Ky. Heis a graduate ofth?. University ofCiicinnati and hasspent more thannice years in theelectronicsiniustry.
The best incentives are not foundin novelty shops, but instead theyshould feature the same built-inquality as the product line sold. In-centive programs are usually keyedto major holidays, vacation periodsand sports for greatest appeal. Suchprograms work particularly well dur-ing prime selling seasons.
The key to the success of manypromotions today is coming up withquality, name -brand "bonus items"or incentives with immediate attrac-tion. Above all, do not offer junk.
Items that we have recently usedsuccessfully include luggage; name -brand cameras, pocket radios andhams; and coupons redeemable forgas at national -brand stations. Eachhad instant appeal and was conve-nient and easy to use.
Now I suppose it would be easyto stop here and ignore such "mi-nor" points as what the distributorreally wants or needs in terms of hislocal market, or whether or not hewill consider one line of productsover the competitors. After all, themarket effort is one thing, whileyour product image is another.
As we well know, distributors of-ten follow the path of least resist-ance and "push" a product simplybecause it is overstocked, there is apromotion program going on, theyhave just been briefed on how to sellit, or it is "new." Or, they will sellthe dealer the brand he specifies,without even thinking to recom-mend a better value.
We think this viewpoint can bechanged by combining quality ser-vices and products with quality in-centives-often something of value,something worth working for, some-thing worth taking home to the fam-ily. Better yet, offer more than oneitem.
There is no doubt in my mindthat dealers and distributors oftenare quite selective in over-the-counter marketing. But once thedealer and distributor taste thefruits of a sound, well -planned mar-keting program offering the best inincentive products and sales oppor-tunities, they will certainly considerthe corresponding manufacturer'sproducts again when placing futureorders. And that is what it is allabout.
44 ELECTRONIC TECHNICIAN / DEALER, FEBRUARY 1971
TESTINSTRUMENTREPORT
HeathkitModel IB-101FrequencyCounterby Phillip Dahlen
Operational simplicitywas apparently one
of the goals of the
instrument's designers
Obtaining precise frequencies isa must for today's electronic tech-nicians. FM multiplex receiversmust produce 38kHz signals that arein phase with the pilot signal, colorTV sets must generate a 3.58MHzcontinuous wave signal in phasewith the color burst signal. And lastmonth's article, "Commercial Two -Way Radio," told of all the frequen-cies available for business use,which must be precisely tuned.These and many other similar appli-cations require the availability of aprecise frequency counter for cali-bration purposes.
The IB- 101 counter uses digital
4A C1 (1
-)
Ill
Fig. 1-Heathkit's Model IB-101 frequency counter. For nore details circle 900 )n Reader's Ser-yic: Card.
integrated circuitry to provide count-ing from 1Hz to reportedly over15MHz with the elimination of di-vider chain adjustments. Specifica-tions indicate that an overrange in-dicator and Hz/kHz switch gives theinstrument's five cold -cathode dis-play tubes the same capability as amore expensive eight -digit counter.This means that with the use of thatrange switch you should be able tomake such frequency readings as14,857,236Hz (a number taken atrandom to indicate the possible ca-pability ).
The input circuit uses a dual -gate,diode -protected MOSFET that isdesigned to provide proper trigger-ing levels from less than 100mv togreater than 200v without any inputlevel adjustment. The input imped-ance is said to be 1M shunted byless than 20pf to minimize circuitloading and error.
The $199.95 kit includes a dou-ble -sided circuit board, dual primarypower transformer, 26 integratedcircuits, 7 transistors and 5 cold -cathode display tubes, plus many re-lated components.
Fig. 2-Although the instrument contains complex circuitry, compcnertsare well arranged to simplify construction.
"We need three Yellow Pages adsto cover our business."
"We advertiseunder washer -dryers,television, andvacuum cleaners. Thatway, whatever apotential customerneeds, he's bound torun across us" explainsAlbert Carlson, ofBarn Appliances,Fenton, Michigan. "Ina small area like thisyou have to build up agood reputation, andyou have to stay incontact with people.One of the best ways todo that is in theYellow Pages. Westress service after asale. It's one of our keypoints in our YellowPages ad. That waycustomers know westand behind what we
46 ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
sell. We've beenadvertising in theYellow Pages for 13years now, and itsbrought us nothing butgood customers."
Let the Yellow Pagesdo your talking.People will listen.
An effectiveYelbw way to buildPages business.
Only the best-selling vangives you all these better ideas
Easy, out -front servicing.Simply raise the convenient
/00of 4 outside hood and yourroutine service points are
right at hand: radiator, oil level, battery,windshield
washer reservoir,voltage regula-
tor, wiper motor,brake master
cylinder. Betterideas make
servicingfast, easy.
Shorter outside, easier to park.Overall length of Econoline Vans is significantly shorter
than other makes. This means easier parking and bettermaneuverability in citydelivery operations Wider at top for built-ins.-time saved Body sides are more vertical, wider apart at top than otheron every trip. So built-in units fit better and leave more aisle. Modular units,
designed to fit and work together allow you to customdesign almost any interior youneed. Job packages, such as
insulated florist's van, arealso available.
OLD
DESIGN
NEW FORD-CLEAR DEOr
DESIGN
O
Sales leader for10 straight years.
Engine clear forward.The ergine is moved forward in Ford'sclear -deck van-all the way out of thecargo area. Clear floor space behinddriver's seat measures over 81/2 ft. inEconoline Van ... over 10ft. in the Supervan.
Strong, smooth -ridingTwin -I -Beam. The inde-pendent front suspension
that has revolutionizedtruck riding qualities.
Two forged steel I-beamaxles give it strength ...
big coil springs giveit a smoother ride.
Biggest payloadof all. Husky
construction andhigh capacity axles allow
you to carry a heavierload than any other van.
Maximum payload of 4320lbs. is largest in industry.
Model
E-300E-200E-100
Max. Payload4320 lbs.1800 lbs.1120 lbs.
Max.GVW
8300 lbs.5400 lbs.4500 lbs.
Driver's "walk-thru" to rear.Econoline's forward engine position
clears the deck for the driver, too. He caneasily step from his seat into the rear load area and exit
through side or rear doors.See your Ford Dealer and see all
the better ideas inAmerica's best-selling van-
Ford Econol ne.
A better idea for safety: Buckle up.
vans.
11.--w-1 FORDECONOLINE
VANScv-071)
... for more details circle 110 on Reader Sery se Card
FEBRUARY 197:, ELECTRONIC TECHNICIAN/DEALER ; 47
TECHNICAL DIGESTThe material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.
OLYMPICTable Radio Models 32/33/34/35-Service Hints
Symptom: Weak sound output, no distortion discernible.Correction: Check the following electrolytics by substitu-
tion: C47, C55 and C56.Symptom: FM inoperative.Correction: Check transistor Tr -1 and the following elec-
trolytics by substitution: C3 and C10.Symptom: AM reception weak, FM inoperative.Correction: Check the following electrolytics by substitu-
tion: C27, C33 and C19. Also consider a transistor defectwhenever the forward bias exceeds 0.4v.
Solid -State TV Model 9P59-Service Hints
Symptom: Loss of raster within first 30 min. of operation.Correction: Replace resistor R514, a 1.511, 1/2w base bias
resistor in the horizontal output stage.Symptom: Critical vertical sync lock and/or complete loss
of vertical and horizontal sync.Correction: Check sync transistors Tr -18 and 19. Also
check by substitution capacitor C405, 1 Opf at 25v.Symptom: Picture flagging at top of raster.Correction: Replace capacitor C503, 3pf at 6v located in
TRUE TRIGGERED SWEEP
OSCILLOSCOPE/VECTORSCOPE
MODELTO -50
DC to 10 mhzfrequency response
.02 volt sensitivity
Calibrated verticalattenuator
Calibrated time base
Supplied with combi-nation direct/locapprobe
5 X magnifier
Automatic triggeringmode
5" flat face tubeedge -lit graticule
One Year Warranty s g g n50All American Made I) j NET
See your distributor or write Dept. ET- 2.
LECTROTECH, INC.4529 N. Kedzie Ave., Chicago, Illinois 60625
Anti -Hunt network of the Horizontal AFC circuit.Symptom: Picture bending and distorted.Correction: Replace capacitor C805, a dual section elec-
trolytic in the power supply.Symptom: Weak sound output.Correction: Check the following electrolytics capacitors by
substitution: C323 and C320 located in the audio -amplifiercircuitry.
Symptom: Fine grain appearance in video (4.5MHz beat).Correction: Realign the L201 -trap coil. Refer to service
manual for alignment instructions.
Model 327 Stereo Chassis-Service Hint
Symptom: Whenever this chassis is separated from cabinetwiring harness, as during shop service, it will be necessaryto install a jumper wire between pins 2 and 4 of the remotespeaker socket to secure stereo speaker operation.
RCA SALES CORP.TV Chassis KCS179/KCS183-Sync and Noise Cancellation Circuit
This receiver's sync section consists of the sync -separatorstage and the noise -cancellation stage. Under normal signalconditions, the sync -separator tube, V201B, and the noise -cancellation transistor, Q20I, are conducting.
A positive -going signal from the video output stage iscoupled through resistor R224 and capacitor C246 to theRC network made up of resistor R248 and capacitor C235.
FROM VIDEOOUTPUT
4-1450 +145V
0224
11242IIIK
0241 1 FROM SECOND
Sloe C244 DETECTOR
TOHOPI?
PHASE
DETECTOR
020113
/2 ROMEOSYNC 11
NOISE CANC R2493 MEG
026422K ., 0246
22K
T- 4700
470
02331.2 MEG
0237I MEG
0201 2405 021101
R254
336
CR 202
FDH 600
TO VERTICALOSCILLATOR
The signal bias developed by this RC network sets the oper-ating point of the tube, allowing the tube to conduct duringsync -pulse time only.
A negative -going video signal from the second detectoris coupled through resistor R254 and diode CR202 to theRC network, consisting of resistor 237 and capacitor C241.This RC network sets the cutoff point of the transistor atthe sync -tip level.
Under normal signal conditions, both stages are conduct-ing, providing sync pulses to the vertical and horizontaloscillators. Since transistor Q201 is operating just shortof cutoff at the sync top level, any pulse, such as anoise spike, which drives the base of the transistor morenegative then the sync tip will cut off the transistor. Withtransistor Q201 cut off during a noise spike, the conduc-tion path of the sync amplifier tube V20 I B is open, deletingany output from the sync separator during the noise -pulsetime; thus maintaining stable vertical and horizontal syn-chronization.
. for more details circle 118 on Reader Service Card
48 ELECTRONIC TECHNICIAN 'DEALER. FEBRUARY 1971
make it the tube to watch.For economy, there is the color screen 85 family
of replacement tubes. But, economy doesn't meancheap construction. You can still give your cus-tomer features like Sylvania's Sharp -Spot electrongun and a rare-earth phosphor screen withoutbreaking his budget.
When you sell Sylvania, you're selling from thebroadest line in the industry. You'll have the tubeto match the set.
And a price tomatch the wallet. GENERAL TELEPHONE &ELECTRONICS
SYLVAN IA
With Sylvania's 3 lines of color tubes, you can meet it.Customers' wallets come in different sizes.Thick, thin and in-between.With Sylvania's 3 complete families of replace-
ment color picture tubes, you can be sure of havingthe right -priced tube for each one.
At the top end of the line, you've got the colorbright 85 ®XR , the tube with our brightest phos-phors and X-ray inhibiting glass.
And in the middle, you have the color bright 85®RE. This is the tube that brought color TV out ofthe dark ages. Its bright rare-earth phosphors still
Every man has his price.
An Extraordinary Offerto introduce you to the benefits of Membership in
ELECTRONICS BOOK CLUBfor a limited time only you can obtain
OF
UNIQUE yours for only CTHESE
BOOKS ... with Trial(Combined List Price $34.85) Club Membership each
May we send you your choice ofany three books on the facing
page as part of an unusual offer of aTrial Membership in Electronics BookClub ?
Here are quality hardbound vol-umes, each especially designed to helpyou increase your know-how, earningpower, and enjoyment of electronics.
These handsome, hardbound booksare indicative of the many other fineofferings made to Members .. . impor-tant books to read and keep . . . vol-umes with your specialized interests inmind.
Whatever your interest in electron-ics -radio and TV servicing, audio andhi-fi, industrial electronics, communi-cations, engineering -you will findthat Electronics Book Club will helpyou.
With the Club providing you withtop quality books, you may broadenyour knowledge and skills to buildyour income and increase your under-standing of electronics, too.
How You Profit From Club Membership
This special offer is just a sample ofthe help and generous savings theClub offers you. For here is a Club de-voted exclusively to seeking out onlythose titles of direct interest to you.Membership in the Club offers youseveral advantages.1. Charter Bonus: Take any three ofthe books shown (combined values upto $34.85) for only 99' each with yourTrial Membership.2. Guaranteed Savings: The Clubguarantees to save you 15% to 75%on all books offered.3. Continuing Bonus: If you continueafter this trial Membership, you willearn a Dividend Certificate for everybook you purchase. Three Certificates,plus payment of the nominal sum of$1.99, will entitle you to a valuableBook Dividend which you may choosefrom a special list provided members.4. Wide Selection: Members are an-nually offered over 50 authoritativebooks on all phases of electronics.5. Bonus Books: If you continue inthe Club after fulfilling your Trial
Membership, you will receive a BonusDividend Certificate with each addi-tional Club Selection you purchase.For the small charge of only $1.99,plus three (3) Certificates, you mayselect a book of your choice from aspecial list of quality books periodical-ly sent to Members.6. Prevents You From Missing NewBooks: The Club's FREE monthlyNews gives you advance notice of im-portant new books . . . books vital toyour continued advancement.
This extraordinary offer is intendedto prove to you, through your own ex-perience, that these very real advan-tages can be yours . . . that it is pos-sible to keep up with the literaturepublished in your areas of interest ...and to save substantially while so do-ing.
How the Club Works
Forthcoming selections are describedin the FREE monthly Club News.Thus, you are among the first to knowabout, and to own if you desire, sig-nificant new books. You choose onlythe main or alternate selection youwant (or advise if you wish no bookat all) by means of a handy form andreturn envelope enclosed with theNews. As part of your Trial Member-ship, you need purchase as few as fourbooks during the coming 12 months.You would probably buy at least thismany anyway . . . without the sub-stantial savings offered through ClubMembership.
Limited Time Offer!
Here, then, is an interesting oppor-tunity to enroll on a trial basis . . . toprove to yourself, in a short time, theadvantages of belonging to Electron-ics Book Club. We urge you, if thisunique offer is appealing, to actpromptly, for we've reserved only alimited number of books for new Mem-bers.
To start your Membership on theseattractive terms, simply fill out andmail the postage -paid airmail card to-day. You will receive the three booksof your choice for 10 -day inspection.
SEND NO MONEY! If you are notdelighted, return them within 10 daysand your Trial Membership will becancelled without cost or obligation.Electronics Book Club, Blue RidgeSummit, Pa. 17214.
Typical Sayings Offered ClubMembers on Recent Selections
Zenith Color TV Service ManualList Price 57.95; Club Price $4.95
Understanding Solid -State CircuitsList Price $7.95; Club Price $4.95
RCA Monochrome TV Service ManualList Price $7.95; Club Price $4.95
TV Trouble Diagnosis Made EasyList Price $7.95; Club Price $4.95
Practical Electronic Servicing TechniquesList Price $7.95; Club Price $3.95
Dictionary of ElectronicsList Price $6.95; Club Price $5.50
Admiral Color TV Service ManualList Price $7.95; Club Price $3.95
Computer Circuits & How They WorkList Price $7.95; Club Price $4.95
Commercial Radio Operator's LicenseStudy Guide
List Price $7.50; Club Price $5.95Home -Call TV Repair Guide
List Price $6.95; Club Price $2.95FET Applications Handbook -2nd Edition
List Price $14.95; Club Price $9.95Electronic Musical Instruments
List Price $7.95; Club Price $4.95Computer Architecture
List Price 512.50; Club Price $8.95Simple Transistor Projects for Hobbyists
List Price $7.95; Club Price $3.95Electronic Test & Measurement Handbook
List Price $7.95; Club Price $4.95Pulse & Switching Circuits
List Price $7.95; Club Price $4.95Circuit Consultant's Casebook
List Price $9.95; Club Price 55.95Amateur Radio Extra Class
License Study GuideList Price $7.95; Club Price $4.95
Small Appliance Repair GuideList Price $7.95; Club Price 54.95
Basic Electronics Problems SolvedList Price $7.95; Club Price $4.95
Handbook of Magnetic RecordingList Price $7.95; Club Price $4.95
125 One -Transistor ProjectsList Price $7.95; Club Price $4.95
Integrated Circuits & SystemsList Price $12.95; Club Price $8.95
Servicing Modern Hi-IFI Stereo SystemsList Price $7.95; Club Price $4.95
104 Easy Projects for the ElectronicsGadgeteer
List Price $6.95; Club Price $3.95
A1111. EXTRAORDINARY OFFER50 ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
Semiconductors From A to ZElectronic Circuit Design
HandbookHow to Repair Solid -State Imports
SEMICONDUCTORS
Here it is-everythingyou need to know aboutsemiconductors - frombasic diodes and tran-sistors to FETs. MOSFETs, tunnel diodes,integrated circuits, var-icaps, photoFETs, light-sensitive and light -emissive devices, in-candescent and lumi-nescent optic -electroniccircuits, unijunctiontransistors, field-effect
diodes, SCR and zener diodes, etc. Explainshow these various devices work and how theyare used, with descriptions of all the commonand unique circuits used in modern semicon-ductor technology. Attention is given to inte-grated circuit applications -- variable -currentand constant -current sources, unbalanced dif-ferential amplifiers, IC applications in FM andTV receivers. TV sound circuits, discriminatorcircuits, and cascade amplifier networks. 272pps., over 300 illus., 26 Chapter
List Price $7.95 Order No. 493
How To Fix Transistor Radios &Printed Circuits
New Third Edition-Abrand-new, enlargededition of the ever pop-ular circuit designer',"cookbook," now con-taining over 600 provencircuits, for all types offunctions, selected frontthousands on the baskof originality and prac-tical application. Novyou can have, at yourfingertips, this careful-ly -planned referenc,source of tried and
tested circuits. Selected from thousands sub-mitted by distinguished engineers, these"thought -starters" are a collection of originalcircuits selected on the basis of their useful-ness. This detailed compilation of practical de-sign data is the answer to the need for an or-eanized gathering of proved circuits . . . bothbasic and advanced designs that can easily,erve as stepping stones to almost any kindof circuit you might want to build. 384 pps..19 big sections, over 600 illus., VA)" x 11".List Price $17.95 Order No. T-101
Electronic Hobbyist's IC ProjectHandbook
Among this vast col-lection of nearly 100hard -to -find schematicsyou'll find such namesas Allied, AutomaticRadio. Peerless Tele-rad, Mercury, Lloyd's,Panasonic, Crown, Mid-land. Penncrest, Toshi-ba. and Matsushita,representing the majorforeign -made chassisdistributed in the U.S.And to help you findreplacement parts, there
is a list of importers and distributors of Japa-nese consumer products. There's also a chap-ter to help you when a schematic isn't avail-able-numerous tips to help you get by with-out the exact diagram. Truly unique amongmanuals of this type. Chapter 5 contains ahost of schematics and service data represent-ing virtually every import you'll come across.along with a 24 -page foldout section. 160 pps.,8,2x11", plus 24 -page foldout section.
List Price $7.95 Order No. 532
Solid State
43-
Philco Color TV Service Manual
t"INSISIOR
RADIOS&
Ch' illitSI8 RYIRISMIdlifIL,
II If WU
Here it is! Just off thepress-a completely up-dated, revised edition ofLeonard Lane's best-selling classic on tran-sistor radio repair. Inaddition to extensiveenrichment of the firstedition, the authorbrings FETs, zener di-odes, FM radios - infact, everything relatedto the current state ofthe art-into the pic-ture. Here's the perfect
reference and guide for electronic technicianswho need to understand and repair semicon-
For those interestedin transistor physics, fundamentals are em-phasized in the first two chapters. The real"meat" begins in Chapter 3 which will thor-ougnly familiarize you with amplifier funda-mertals, basic circuit configurations, biasing.FETs, JF'ETs, and IGFETs. The next twochapters will acquaint you with RI.' and IFamplifiers. 256 pps., over 150 illus., 12 Chapters.List Price $7.95 Order No. 504
ECIRONIC HOBEYIST
l'IMJECTS HANDEOOK
Here's your chance tobecome familiar withthose fascinating com-ponents-integrated cir-cuits - and have funbuilding some useful de-vices at the same time.In all, this new bookdescribes 50 differentprojects, all based onusing popular IC',which are inexpensi%,and available at allparts stores. Some ofthe devices - such as
the 1 -watt phono amp and IC power supply- -can be built in an evening. More sophisticatedwojects-like the electronic organ or theIIDIAA equalization preamp-offer a greaterchallenge. You can build practical devices likethe tachometer with bulb alert, or the 50 -wattamplifier, or some "just for fun" gadgets likethe simple memory tester or the miniatureadding machine. 160 pages, 50 projects, 100Illus.
List Price $6.95 Order No. 464
PHILCOIAR TV SERVICE MANUAL
An all -in -one serviceguide for Philco colorsets, with 12 completeschematic diagrams forchassis 15M90/91 to20QT88. Here in onemanual is completeservice data for all thecolor models producedby Philco and PhilcoFord (thru 1970), fromthe all -tube to the lat-est hybrid solid-statechassis, including thesmall -screen portable
Model T5062WA. The unique 36 -page foldoutsection contains 12 complete schematic dia-grams, representing all the chassis covered.The profusely illustrated text delves into eachsection (video, chrome, vertical, horizontal,etc.), and points out specific problems based onthe author's extensive experience. Includedare complete alignment and setup instructions.detailed in step-by-step form. 160 pps., plus36 -page schematic foldout section. Long -lifeviryl cover.List Price 57.95 Order No. 522
Handbook of SemiconductorCircuits
Contains 124 examplesof standard transistorcircuits, complete withoperational data foramplifiers, oscillators,logic and switching cir-cuits, power supplies,and various nonlinearcircuits. The broadrange of circuits includ-ed were selected on thebasis of application andpracticality. A designphilosophy section is
included with each group of circuits, therebyproviding a basis for understanding circuitsother than those selected as examples. This isnot a handbook of "preferred" circuits, butrather a collection of practical circuits whichhave wide application and exemplifying goodengineering design. Each circuit descriptionincludes data concerning any unique design oroperational data, along with schematic dia-grams. Hundreds of illustrations and diagrams.448 pps., 6" x 9". Hardbound.
List Price $8.95 Order No. G-30
Electronics Reference Databook
ELECTRONICS
REFERENCE
DATABOOKI.
I
This new book is muchmore than a simple col-lection of tables, formu-las, graphs, equations,etc. In addition to theabundance of helpful in-formation given, it pro-vides specific guidancein the use of data. Nu-merous problems asso-ciated with every levelof interest-from elec-tronics theory (formu-las, laws) to measure-ments, tests, and circuit
design work-are covered. In so doing, the au-thor explains how to use the data (from this orother volumes) for purposes other than thoselisted. Covers Electronics Theory, Use of J Op-erator, Exponential and Other Tables. Attenua-tors and Equalizers, Filter Design, PracticalComponent Design and Application, Tube andSemiconductor Circuit Design and Operation,and Transmission Lines. 224 pps., over 100
plus 45 t bl,. Hardbound.List Price 57.95 Order No. 488
How to Use Test Instruments inElectronics Servicing
A long -needed, practicalhandbook on test equip-ment applications -ranging from the useof audio gear to tubeand transistor checkers.Just what you need toput your test equip-ment to work. Not a"how -it -works" treat-ment, but a "how-to"manual describing spe-cific tests and trouble-shooting techniques forthe electronic techni-
cian. You'll discover new ways to use yourscope and several new "tricks" you can per-form with multitesters. You'll learn signal -in-jection troubleshooting, how to measure induc-tance and capacitance with the help of yoursignal generator, pointers and pitfalls for us-ing markers. sweeps and pattern generators.shortcuts and special techniques for color TVtroubleshooting, how to test audio circuits andFM stereo equipment, and much more. 256pits., over 200 illus. Hardbound.List Price 57.95 Order No. 485
SENDNO MONEY! Simply fill in and mail postage -paid Airmail card today!
. . . for more details circle 104 on Reader Service Card
FEBRUARY .971, ELECTRONIC TECHNICIAN/DEALER 53
COLORFAXThe material used in this section is selected frominformation supplied through the cooperation of therespective manufacturers or their agencies.
ADMIRALColor TV Chassis K20 -Troubleshooting For No Color
As shown in the block diagram, the chroma section ofthe K20 series color -TV chassis has 10 transistor stages. Ofthese, six circuits function as ac amplifiers and four circuitsfunction as dc control switches. The following procedure
viDEO DE.00
0'05
14 Z.
07045.50 0.
0
will help you to quickly isolate a defective stage for "nocolor" after which normal troubleshooting will isolate thedefective part.1. Apply color bar signal to VHF tuner terminals (a colorprogram can be used).2. Set Color control to mid -range.3. Set Color Threshold control fully clockwise.Test Procedure1. Connect scope to point 7K (Pin 2 of 6BV11 tube) andcheck for a 3.58MHz signal. (Test point 7K is the pin tothe left of the word "7K" printed on the board -do not usethe pin directly above the printed 7K.)
a. If a 3.58MHz signal is not present, the problem is inthe buffer, driver or color oscillator circuit. Proceedto step 2.
b. If a 3.58MHz signal is present, proceed to step 3.2. Using an AM generator, inject approximately a 3.58MHzsignal at the base element of transistor Q706. Leave the scopeat point 7K and watch for the 3.58MHz signal. Use thesame procedure in checking transistors Q704 and Q705. Af-ter you have isolated the stage that does not produce a sig-nal at point 7K, use a VTVM to locate the faulty compo-nent. Do not overlook the crystal circuit.3. Connect the jumper from the 25v supply (red wire) toTP7B (Collector of transistor Q708, the killer amplifier)on the circuit board.
a. If the color does not appear on the CRT, the prob-lem is in the Color Monitor (if used) or in the firstor second bandpass amplifier. Continue to step 4.
TOOL CASESFIELD ENGINEER ATTACHE CASE HOLDS 60 TOOLS
Thousands of these cases are in use today by fieldengineers stationed throughout the world. The Jensencase features solid wood frame with scuff -proof Mar-velon cover. All brass hardware. Compartments in
base for spare parts and atest meter. Dimensions18x 13 x 4-3/4". Threestyles. Write fcr catalog.
54D704....$49.50(postpaid)
Fitt C40yELECTRONIC ASSEMBLY TOOLS
er.ENtatEN TOOLS and ALLOYS4117 N. 44th Street, Phoenix, Arizona 85018
... for more details circle 113 on Reader Service Card
54 ELECTRONIC TECHNICIAN DEALER, FEBRUARY 1971
b. If color does appear, the problem is in the Killer am-plifier, Killer Detector or Burst amplifier. Proceed tostep 5.
4. To check the Color Monitor, disconnect the wire frompoint 6F on the monitor board and connect it to point 6H.
a. If color is now present, the problem is in the ColorMonitor. Check the stages containing transistorsQ601 and Q605.
b. If color does not appear, the problem is in the first orsecond bandpass amplifier. Use the VTVM to check.
5. Disconnect the jumper to point TP7B that was added instep 3.6. To check the Killer amplifier, connect a 68K resistorfrom TP7E to ground (collector of transistor Q707). Ifcolor now appears, the Killer amplifier is okay. Remove theresistor.7. To check the Killer detector, short the base element toground. The collector voltage should rise to approximately22v. Remove the base short and the collector voltage shoulddecrease to approximately 17.5v. If the stage voltages areokay, proceed to step 8.8. If the Burst amplifier is at fault, there should be coloron the CRT during step 3 but it is probably out of sync.
WESTINGHOUSEColor TV Chassis V2655, V2656 -Service Hints
In early production of the IF printed circuit boards, thevalue of resistor R213, a 4752 resistor, was incorrectlymarked 47K on the top of the PC board.
Resistor R2I3 is a stone -type fusible resistor which may
break apart under overload conditions. When this happens,the technician may see the 47K marking and replace theburned out one with a 47K value (which is wrong), thecorrect value should be 4751. Please note the location ofresistor R213 on the partial diagram of the IF PC boardand replace it only with a 4711, 4w, fusible, stone -type re-sistor, Westinghouse part number 250V020H79.
Thirteen cures for 78 headaches.Integrated circuits are replacing transistor circuits
in many stereos, radios, B & W and color TVs.That means more parts to stock and more money tied
up in inventory.Now, Sylvania ECG can take some of the pain out of these
stocking headaches.Our 13 ICs will replace 78 part numbers,
including RF, IF and audio amplifiers,sound detectors, oscillator/mixers,chroma demodulators, and auto-matic fine-tuning systems.
That's 65 fewer items to stock.And our 13 ICs are just part
of our ECG replacement line. That's the linethat lets you replace 35,000 semi-
conductor types with just 87Sylvania ECG types.
It's the line that lets you puta complete stockroom on one
shelf.Maybe the same shelf where you
used to keep the aspirin.
SYLVANIA
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 55
NEW PRODUCTSWORKMAN
PRODUCTS INCPO BOX 3121 5611501 1l01110.6 33571
OEM and REPLACEMENTMANUFACTURERS OF
FAIL
SAFEIN
MOLDEDBLACKHENOLI
CIRCUIT
BREAKERS
CAS EC
14 ModelsFA1 to
FA7
El 1162 6530MODEL FAA 2.5 AMP
CARRY CURRENT
FREE
FREE
BUTTON EXTENSIONIN PACKAGE
VEST POCKETCROSS REFERENCE
ASK FOR BOOKLET :: X53
RECOGNIZED UNDER THECOMPONENT PROGRAM OF
UNDERWRITERS' LABORATORIES,INC.
.. for more details circle 132 on Reader Service Card
REBUILDYOUR OWN
PICTURE TUBES?
With Lakeside Industries precision equip-ment, you can rebuild any picture tube!
EASY TO OPERATE!
Requires only 4 x 8 ft. of space.Your cost to rebuild black and white-V.50Your cost to rebuild Color-$5.80.For complete details, mail coupon.
LAKESIDE INDUSTRIES5234 N. Clark St.Chicago, III. 60640Phone: 312.271-3399
D Free demonstration appointmentri Send me more information
Name
AddressCity Step
For additional information on products described in this section, circlethe numbers on Reader Service Card. Requests will be handled promptly.
ATTENUATOR 703Replaces standardcarbon composition components
Distortion free ac signals, 0 to 300MHz, for CATV or audio distributionsystems are reportedly now providedby a 7512 plug-in "T" pad, measuring0.375 in. in diameter and 0.473 in.high, and incorporating a thick filmcermet resistive element. The designreportedly provides minimum induc-tance with improved stability. Theyare said to be available in II valuesranging from 0 to I5dB. Signal levelsare determined at each CATV/CCTVor audio installation by simply plug-ging in the proper "T" pad. Ratedtolerances are ±0.05 to -±-1.0dB, de-pending on the component. The plas-
tic -cased plug-in attenuator reportedlymounts in a standard TO -5 base hav-ing a 200 in. pin circle. The manufac-turer indicates that it has gold-platedhalf -hard corrosion -resistant brass pinswith rounded tips for easier insertion.The "T" pad is said to be installed inPC boards to replace standard carboncomposition components, especially inautomatic control circuits where atten-uation is needed over a 0 to 300MHzfrequency range. Examples of its useat audio frequencies are said to includeline amplifiers, telephone terminals,communications receivers, and similar7511 impedance/power matched in-stallations. Other impedances are saidto be available on special order.Aerovox.
TV STRIP AMPLIFIER 704
Occupies minimumof rack space
A series of solid-state, high -voltagestrip amplifiers is developed for the
distribution of TV and FM signals invery large MATV and CATV systems.Manufacturers specifications indicatethe unit features a full 4v output andoccupies only 13A in. of rack space.
Designated the THPM, each single -channel unit has a rated bandwidth of6MHz for semi -adjacent TV channeloperation. Models are said to be avail-able for low band operation (Channels2 to 6), high -band operation (Channels7 to 13) and FM band operation witha 20MHz bandwidth. Each amplifierreportedly has separate 7511 inputterminals for various source pick-ups,while outputs are loop -mixed with7512 cable. Specifications indicate thatthe total gain of the AGC controlledTV amplifier is greater than 55dB,while the gain of the FM amplifier isabove 45dB. The wall or rack mount-ed units have a rated output capabilityof 4v (+72dBmv), with a level con-trol to adjust between I v and 4v. Forgood skirt selectivity, greater than30dB at the next non -adjacent channeledge, the amplifiers reportedly havetriple -tuned input and double -tunedoutput band-pass filters. Jerrold.
CONTACT CLEANER
force removes solidsand leaves no residue
705
A contact cleaner is said to containtrichloro-trifluoroethane with a fluori-nated propellantin an aerosol con-tainer. It report-edly forces resid-ual contaminationfrom the surfaceand dissolved oilsare said to be vol-atilized and re-moved in secondswith solvent evap-oration. Manu-facturer specifica-tions indicate thatthe cleaner has noflash or fine pointand is nonexplo-sive, nonstainingand noncorrosivefor all metals. Thesolvent is formulated to permit clean-
COCONTACTCLEANER
.. for more details circle 116 on Reader Service Card
56 ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971... for more details circle 103 on Reader Service Card
They're "market -engineered" todominate color reception lead-insales. Metro-ColorTM for congestedviewing areas. Maxi-ColorTM forthe suburban viewing market. Realsales grabbers. Created to bringhome a better color picture ...more profit for you. Colorful eye -stopping packages. Long warranties.Flexible, small size for easy installa-tion. Competitive pricing. And a"Hot Line" display, too! That'sthe program. Grab it whileit's hot. See yourBelden DISTRIBUTORtoday. 8-3-C
Belden Corporation,P. 0. 3ox 5070-A,Chicago, Illinois60680.
Metro -Color arid Maxi -Coloralso available in bulk
... new ideas formoving electrical energy
REPEATED BY POPULAR DEMAND NEW PRODUCTS
FREE!A CAN OF YOUR FAVORITE
TUNER -SPRAY!Of course, there's a catch. You have to buy a can of TUN-O-BRITE to get yourfree can. The whole idea is to get you to try TUN-O-BRITE. Because TUN-O-BRITE is so much better than ordinary tuner sprays that once you try it, you'llnever settle for anything less.
HOW TO GET YOUR FREE CAN0 Buy a can of TUN-O-BRITE from your favorite distributor.
2 Send the empty can to Chemtronics and tell us what kind of tuner sprayyou want free.
0 We'll send you any 8 oz. can you request, FREE!
That's right, you can get a free canof TUN-O-BRITE or any competitivebrand. So far, nobody has asked usfor anything but TUN-O-BRITE, butwe'll send you anything you want.
ONLY ONEFREE CAN TO ATECHNICIAN
THIS OFFEREXPIRESAPRIL 15, 1971
CHEMTRONICS1260 RALPH AVE.BKLYN., N.Y. 11236
PFORROFESSIONALTV TECHNICIANS
...406N0HEAVY DUTY TUNER
SPRAY WITH BUILT INPOUSHING ACTION!
SHAKE
ing of components without having aneffect on plastics, elastomers, paintedor varnished base material. Low sur-face tension reportedly permits pene-tration of the contact cleaner intocracks and crevices and also allows forgood wetting properties. CRC Chemi-cals.
CRT ADAPTER 706
Converts tube tester intoCRT tester
The Model MH-3A CRT Adapterreportedly tests all B/W picture tubesranging from 8 in. to 30 in., 50° to115°, 12 pin bases, 8 pin bases or the
very latest 7 pin bases. Specificationsindicate that two 14 -pin sockets and aspecial color switch arc designed tocheck each of the red, green and bluecolor guns of the color CRT separate-ly. Coletronics Service.
VOM 707
Large three -color meterpanel with mirror -scale
The WV -520A VOM features arated sensitivity of 100,0001/v fordc measurements and 10,0001/v forac measurements. Also featured is a
rotating function and range switch, aconvenient polarity reversing switch,and a large meter panel with a mirror -
scale. Manufacturer specifications indi-cate that this instrument is designed to
... for more details circle 106 on Reader Service Card
58 ELECTRONIC TECHNICIAN/DEALER. FEBRUARY 1971
THE NEW DODGE MAXIVAN TRADESMAN
will carry a 12 -toot sailboat , plus its mast
, a living room -size roll of carpeting
a snooker table , or a full-size alligator-t under cover, and still give you all 31
features the other Dodge Strong models do.
There's only one way to get power steering or""and Fresh Air air conditioning in a compact
van, and that is to buy a Dodge. Go ahead, call
it the world's biggest compact van .
Because that's what the Dodge Maxivan
Open its doors and say, "ah!"
At your Dodge Dealer's. NEW DODGEMAXIVANSTRONG BOX
41b,
Dodge Truths ,CITY2,!;E'0",
.-......,. . . for more details circle 107 on Reader Service Card
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 59
NEW PRODUCTS
measure dc voltages from 10mv to1,500v, ac voltage (RMS) from100mv to 1500v, direct current from0.5ma to 5amp, resistance from 0.0511to 20M and decibels from -20dB to+55.5dB. The instrument is said to bein a case that measures 71/4 in. by 51/4in. by 23/11 in., weigh 3 lb and is re-portedly supplied complete with testleads and two 1.5v C -cell batteries.Price $48. RCA.
SIGNAL -TONE ENCODERS 708
Five switch -selectedoutput tones
Automatically activated signal -tone
encoders are designed for use withtwo-way radio equipment. Keyed byclosing the transmitter microphoneswitch, the encoder generates a shortduration tone burst which modulatesthe transmitter and automatically ac-
tivates tone -access repeaters, tone op-erated receiver squelch circuits, orother signaling devices. The ModelTE-5 is said to have five switch -select-ed output tones. The frequency rangeis reportedly field adjustable from1600 to 2800Hz with a frequency sta-bility of ± 2 percent from -10° to+60°C. Specifications indicate thatthe 0.5 sec output tone burst is a 6vP -P open circuit sine wave, with out-put impedance adjustable in threesteps. The encoders and their 9v bat-teries are reportedly housed in a 21/4 -by 11/4- by 31/4 -in. high -impact plasticcase and connected to the transmittermicrophone audio circuit by a l5in.shielded cable. An aluminum bracketis provided for mounting the encoderto the transmitter. Price $39.95. Rossand White Co.
FM STEREO...continued from page 40
than it was to those RF frequenciesthat fell between. Under these con-ditions, a receiver would be able totune in the same station at two ad-jacent points on the dial.
As had been previously indicated,the description just given for thescope traces shown in Fig. 11 wouldhave been true had the scope beenfunctioning as before. Actuallysomething entirely different was seen
Fig. 11-Same vertical signals applied as inFig. 9, but with the scope's 30Hz internal hor-izontal sweep rather than the 60Hz sine -wavehorizontal sweep provided by the generator.
Fig. 12-Same vertical signals applied as inFig. 10, but with the scope's 30Hz internalhorizontal sweep rather than the 60Hz sine -
wave horizontal sweep provided by the gener-ator.
on the scope. The scope traces inFig. 11 and 12 are of the same sig-nal conditions illustrated in Fig. 9and 10, respectively, except that the
scope was using an internal 30Hzsaw -tooth horizontal -sweep signalrather than the 60Hz sine -wavehorizontal -sweep signal that hadbeen used. In the previous illustra-tions we saw a distorted 60Hz sinewave folded back upon itself, andwith the non-linear horizontal scopetrace it appeared as a distorted diag-onal line. (This was not due to somefault of the scope. Sine waves arenon-linear in nature.) These last twoillustrations instead show a pair ofwaves representing the distorted60Hz signal obtained from the de-tuned discriminator circuit. A simi-lar comparison could be made of the10kHz patterns-the top scopetraces in each of these illustrations.
When aligning an FM receiver,the IF and discriminator circuitsshould be adjusted so that the diag-onal wave shown in the bottomscope trace (Fig. 4) remainsstraight, while there is little noise ap-parent in the upper scope trace.With each improvement in align-ment, it is possible to reduce thegenerator's RF output while main-taining the desired scope pattern-thus increasing receiver sensitivity.
Many multiplex waveformsare also possible.
Space does not permit us to covereach of the many special features in-corporated in this generator. Be-cause of such limitations, the re-maining photographs show but twoof the many stereo waveforms that
this generator can produce. Fig. 13shows the right channel receiving a60Hz signal (note the 10kHz signalriding upon it), while Fig. 14 shows
Fig. 13-Waveform observed when a 60Hzstereo signal was transmitted to the receiver'sright channel, the channel to which the scopewas connected.
Fig. 14-Virtually no waveform was observedwhen the same 60Hz stereo signal was trans-mitted to the receiver's left channel, while thescope remained connected to the right chan-nel.
the same audio channel after thestereo signal has been switched tothe left channel. In this instance thechannel separation resulted from a10 percent pilot signal level, butchannel separation was also observedwith a 2.5 percent pilot signal level.
As with the previously describedalignment procedures, stereo separa-tion can be improved by peaking thetuned circuits to maintain the de-sired waveform while at the sametime reducing the generator's signaloutput.
60 I ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
modet310 -FET
needa high -sensitivity,
hand -size V -O -M...Buy Triplett's 31 O-FET
With a 10 megohm input resis-tance and a 300 mV DC sensitiv-ity, Triplett's handy little Model310-FET can handle practicallyany electrical measurement youmay need.
Seventeen ranges (plus 6 ACcurrent ranges to 300 A with itsoptional clamp -on ammeter at-tachment), 3% DC and 4% AC
1. Hand -size FET V -O -M with 10 megohmDC input resistance.
2. Low voltage range of 300 mV DC; X1megohm range.
3. Single range switch; DC polarity -reversing switch.
accuracy, a polarity -reversingswitch and a rugged suspension -
type meter to soak up the hardknocks make the 310-FET themost convenient and most ca-pable hand -size V -O -M you can
buy.
It's a real value at $78, so seeit right now at your local Trip-lett distributor. For more infor-
... for more details circle 128 on Reader Service Card
mation, or for a free demonstra-tion, see him or your Triplettsales representative. TriplettCorporation, Bluffton, Ohio45817.
111.TRIPLETTThe Worlds most complete line of V 0 -M's ...choose the one that's just right for ycu
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 161
Same basic constructionand fastens samewires as No. T-18.
Also used forRADIANT
HEAT WIRE
TOR R IOW 1AUTOMATI
STAPLE GUNSCUT WIRE & CABLE
INSTALLATION COSTS. . without cutting into insulation!SAFE! Grooved Guide positions wire forproper staple envelopment! Grooved DrivingBlade stops staple at right depth of penetrationto prevent cutting into wire or cable insulation!
No. T-18-Fits wires up to3 / 16" in diameter.
BELL,TELEPHONE,
THERMOSTAT,INTERCOM,BURGLAR
ALARMand other lowvoltage wiring.
Uses 1-18staples with 3/16" round crown
in 3/8" leg length only.
No. T-2 5-Fits wires up to
r.............--1 /4" in diameter.
Uses T-25 staples
T-18 and 1-25 staples also available in Monel andwith beige, brown and ivory finish at extra cost.
with 1/4" round crown in 9/32",
I
3/8", 7/16" and 9/16" leg lengths.;'
S
. T-75-Fits wires and cablesup to 1/2" in diameter.
RADIANT HEATCABLE,
UF CABLE,N-\, WIRE CONDUIT
I COPPER TUBINGor any non-metallic
sheathed cable.Also used as
DRIVE RINGSin stringing wires.
Uses T-75 staples with 1/2"flat crown in 9/16", 5/8" and
v 7/8" leg length/
Arrow Automatic Staple Guns save 70% in timeand effort on every type of wire or cable fasten-ing job. Arrow staples are specially designed withdivergent -pointed legs for easier driving androsin -coated for greater holding power! All -steelconstruction and high -carbon hardened steelworking parts are your assurance of maximumlong -life service and trouble -free performance.
Ask your Electrical Supply Dealeror write for further details.
L..Saddle Brook, New Jersey 07663
"Pioneers and PacesettersFor Almost A Half Century"
DEALER SHOWCASEFor additional information on products described in this section, circlethe numbers on Reader Service Card. Recuests will be handled promptly.
TOOLS
Display board with walnut finishand colorful header
A compact, specialized tool depart-ment, No. 70071, is designed for highperformance. Reportedly included onthe display are reversible screw driv-ers, screw launchers, spring tools, self-adjusting nut drivers, 6/I2v testers,crimping tools, flexible shaft tune-uptools, hex key wrench sets, pow'riveter,wire strippers, and a selection of sol-derless terminals and pow'rivets. Thedisplay panel features are said to in-clude: on -sight inventory controlthrough printed illustrations and stocknumbers of each item, attractive wa--
TOOLS and TERMINALS
nut finish with colorful header anddurable chrome -plated hanging hooks.The display is said to measure 24 in.by 36 in. and sell for $100. Vaco.
CAR STEREO TAPE PLAYER
Total rated peak powerof 18w
710
The Model I2R300 eight -track tapestereo player features solid-state cir-cuitry and operates on 12vdc negative
!len omlow
4 I
gnd. It is rated for a total peak powerof 18w and has a front loading ar-rangement with dust door. Controls
709 include push-button program selectorand sliding Stereo Balance controlwith center detent, as well as safetyrecessed volume and tone thumb -wheels. Price $78.50. RCA.
DIRECTION FINDER RADIO 711
Covers 30 snort -wave services plusmarine and aviation
The CR-44A "Ranger" is designedto tune over the 200 to 400kHz rangewhere directional finding (DF) beaconstations transmit. The finder is report-edly equipped with an AGC circuitand special 20dB transistor amplifierused in the meter circuit to providenull indication. The portable's high ef-ficiency circuitry reportedly providesfor extended battery life (400 hr),precise signal -locking reliability andover 500mw of audio output power.The radio is also said to provide AMreception of standard broadcast sta-tions on 540 to 1600kHz; FM in the88 to 108MHz band; FAA and Cana-dian weather -navigation stations, plus
NEW MONITOR
RECEIVER
goes anywhere!fY 1011 11011114
MOBILE with built-in DC supply BASE with AC supply in conven-
ient desk -top stand PORTABLE with rechargeable
power pack complete with handleand antenna
VHF FM models cover 148-174MHz with 5 channels. Profes-sional features Include crystalfilter and true noise -operatedsquelch.
You're going to hearmore from...
I0 Waseca, Minnesota 56093
. for more details circle 114 on Reader Service Card... for more details circle 101 on Reader Service Card
62 ELECTRONIC TECHNICIAN/ DEALER. FEBRUARY 1971
NEWFREE 1971 CATALOG!Now, with more kits, morecolor. Fully describes thesealong with over 300 kits forstereo/hi-fi, color TV, elec-tronic organs, guitar ampli-'iers, amateur radio, marine,educational, CB, home &hobby. Mail coupon or write4eath Company, Benton Har-aor, Michigan 49022.
StackThese Up
Against The Othersyour best buys in meters
come from Heath
For over 20 years, Heat has been the first choice inmeters for tens of thousands of service technicians,schools and home labs. There's a reason for this con-tinued popularity- Heath meters are designed to havethat balance of versatility, needed features and lowcost that make them your best buy. For the price of justa couple of meters from others, you can buy every meterHeath makes. We believe that you should still be ableto get a stack of meters without spending a pile ofmoney. When you need a meter, look to Heath. For per-forrrance, versatility mod top dollar value, the othersjust don't stack up.® $21.95* Buys A Portable Solid -State Volt -Ohm -Meter.Four ranges on AC & DC volts measure 1-1000 volts fullscale. Four resistance ranges measure 0.1 ohm to 1000megohms. Features convenient battery operation ...zero & ohms adj. controls...DC polarity reversingswitch ...spare jack for HV & RF probes...rugged poly-propylene carrying case. IM -17, 5 lbs.
© $34.95* Buys A Portable Volt -Ohm Milliammeter.Measures AC & DC volts 1.5-5000 full scale. DC currentfrom 150 uA to 15A. Resistance midscale from 15-150,000ohms. Large 41/2" 50 uA movement meter for extra ac-curacy. MM -1, 5 lbs.
© $29.95* Buys An Accurate VTVM. 7 AC & DC rangesmeasure RMS volts frcm 1.5-15,000 full scale ... AC P -Pfrom 4.0-4000 ... 7 resistance ranges from 0.1 ohms to1000 megohms. 25 Hz - 1 MHz response. Single probemakes all measuremerts. IM -18, 5 lbs. Assembled IMW-18, 6 lbs.... $54.95*
0 $41.95* Buys A Laboratory AC VTVM. Especially use-ful for low-level AC & audio work. Ten RMS ranges from0.01-300 V full scale . . measures dB from -52 to +58.±1 dB response from 10 Hz -500 kHz. 10 megs. inputimpedance. IM -38, 5 IDs. Assembled IMW-38, 6 lbs....$57.95*
0 $39.95* Buys A Big Service Bench VTVM. Has thesame high performance as the IM -18 above, plus addedfeatures to mane it more useful for service work...separate 1.5 & 5 VAC scales ... calibration controls thatare adjustable from the front panel ... versatile gimbalmounting... large 7" meter. IM -28, 7 lbs.e $49.95* Buys A Big Solid -State Volt -Ohm Meter. Bat-tery -powered portability plus built-in AC supply. 8 AC &DC ranges 0.5-1500 full scale ... 7 resistance ranges (10ohm center scale) xl-xl meg. High input impedance &6" meter for greater accuracy. IM -16, 10 lbs. AssembledI MW -16, 11 lbs.. .. $79.95*
© $85.00* Buys A Deluxe Solid -State Volt -Ohm Milliam-meter. 9 AC & DC ranges from 150 mV -1500 V full scale...7 resistance ranges measure from 1 ohm to 1000megohms 11 current ranges from 15 uA-1.5 A fullscale. 100 kHz response ... high input impedance ...large 6" meter with zero center. 1M-25, 11 lbs. AssembledI MW -25, 11 I bs.... $120.00*
HE AT 1-1 kr I -r 1 .
HEATH COMPANY, Dept. 24-2Benton Harbor, Michigan 49022
O Enclosed is $ plus shipping.
Please send model (s)O Please send FREE Heathkit Catalog. 0 Please send Credit Application.
Name
a Schlumberger company
Address
City State lip*Mail order prices; F.O.B. factory. Prices & specifications subject to change without notice. TE-238
I-
. for more details circle 112 on Reader Service Card
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 63
THE WORKHORSEThe industry's top replacement tube, 5GH8A,is used in so many makes of TV and in so manydifferent applications that it will be a high vol-ume replacement type for years to come.
RCA's versatile 6GH8A is designed to satisfythe demands of all these applications:Multi -vibrator type horizontal-deflection-oscil-iator circuits, sound if -amplifier, agc-amplifier,burst -amplifier, chroma-amplifier, 3.58 MHz -oscillator demodulator circuits, video -amplifier,sync -separator, noise inverter, color killer con-trol, matrix -amplifier and blanker applications.
Three good reasons to replace with the RCA-6GH8A:1. Stringent performance tests eliminate shorts.Special processes and tests minimize inter -element leakage.2. Low heater -cathode leakage.3. Optimum gm for efficient operation in allapplications.Stock up on the industry's workhorse 6GH8Aand specify RCA! See your RCA tube distrib-utor for all your tube requirements.RCA l Electronic Components,' Harrison, N.J.
64 ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
DEALER SHOWCASE
marine and aviation radio beacons onthe 185 to 400kHz long -wave range.
The radio reportedly also provides theuser with marine calling and distress,marine weather stations, amateur andother services in the 2.0 to 5.2MHzrange. Services in the 152 to I 74MHzrange are also said to be received. Themanufacturer indicates that this is a71 -lb, "D" -battery -operated radiowhich is equipped with a navigationaldirection finder that operates on threebands: longwave, standard broadcast(AM) and marine 2.0 to 5.2MHz. Re-tail price $149.95. Hallicrafter.
ANTENNA MOUNTING 712HARDWARE
Blister packed formerchandising convenience
A line of TV -antenna mounting ac-cessories including masting, groundrods and UHF/VHF transmissionlines is blister packed for merchandis-ing convenience. The line is said to in-clude chimney mounts, roof mounts,wall mounts, standard lead-in wire in-sulators, turnbuckles, guy hooks, eyebolts, guy rings and clamps, lightning
arrestors, ground rods, various lengthsof poly clad transmission line, signalsplitters, multiset couplers, and lengthsof mast. Channel Master.
BURGLAR ALARM 713
Monitoring capability expandsfor broader coverage
A solid-state ultrasonic burglaralarm system contains a separate re-ceiver and transmitter for greater flex-ibility and broader coverage. Using thesame detection principles found inmilitary and industrial alarm systems,
the patented "double check" electroniccircuitry reportedly offers built-in pro-tection against false alarms. The unitis designed for usage in small commer-cial businesses as well as homes andapartments. Northern Electric.
IF YOU ARE A TVREPAIR MAN YOU NEED
TV TECH AIDTV TECH AID is the best trouble shootingguide available today. It takes all theguesswork out of TV repair and is de-signed to help you solve your problemsquickly and economically.Each month you receive updated informa-tion on up to 40 different trouble -shootingcases. This important information is sup-plied to us by technicians, field reps andall the leading TV manufacturers. You willfind every symptom pictured with a clearlymarked schematic of the particular faultystage. The faulty components and correc-tions will also be listed to aid in repair.You go right to the source of the troublewithout guesswork. In addition you getvaluable information on current models aswell as older models along with circuitchanges and modifications as they occur.
TV TECH AIDP.O. BOX 603KINGS PARK. N.Y. 11754
ENCLOSED IS A CHECK OR MONEYORDER FOR $
PLEASE SEND:
1971-12 ISSUES-$7.95
1970-BOOK FORM-$5.95 1969-12 ISSUES-$4.95
TO:
NAME
ADDRESS
CITY .......
STATE ZI I'
1
L. . . for more details circle 130 on Reader Service Card
LittleGIANT
SENCORE CG19 CADDY BAR COLOR GENERATORSmall enough, light enough to carry right ii your tube caddy-so you have ithandy on every color TV service call.Little giant in performance. All crystal contTolled standard RCA licensed colorbars, crosshatch, white dots, vertical .ines, lorizontal lines. Rock solid or yourmoney back.
New circuitry. Less current drain permits full voltage regulation on all circuits,and increases battery life.Timer range doubled over previous models.
Lowest priced unit available, $84.50 All Domestic Made
IN STOCK AT YOUR LOCALPARTS DISTRIBUTOR.
I\JCCDI=t45. NO I MANUFA.:TURER OF ELECTRONIC MAINTENANCE EQUIPMENT
3200 Sencore Drive, Sioux Falls, South Dakota 57100... for more details circle 124 sn Reader Service Card
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 65
When people
turn to you
to make thincs
richt acain
744 WI" 01 TV UT
^'. lb is fMSW{,(R ,CRIL111(1.
MTN CAlli
le ElICTIIIC.0461111Cittn.
use GE ULTRACOLOR picture tubes
(made by professionals for professionals)
TUBE PRODUCTS DEPARTMENT GENERAL ELECTRIC COMPANYOWENSBORO, KENTUCKY 42301
GENERAL ELECTRIC
66 ELECTRONIC TEHNICIANTEALER, FEBRUARY 1971
TECHNICALLITERATUREFor additional information on productsdescribed in this section, circle thenumbers on Reader Service Card.Requests will be handled promptly.
Electronic Parts and Supplies 400A 616 -page 1971 catalog, No. 710.
of electronics parts and supplies listsover 70,000 separate stock itemsfrom more than 700 manufacturers.Detailed specifications, descriptionsand illustrations, as well as pricingcover a vast array of parts and com-ponents including-semiconductors,integrated circuit devices, tubes, re-lays, timers, transformers, resistors,capacitors, connectors, coils, chokes,sockets, plugs, jacks, switches, fuses,batteries, clips, lamps, wire and cable,and much more. Other major sectionsof the catalog feature test instruments,recording equipment, sound equip-ment, intercoms and other businesscommunications gear, power supplies,electronic counters, industrial sili-cones, epoxy material and other chem-icals, hardware, technical books, toolsand solder equipment. Allied Elec-tronics.
Wire Cable and Tubing 401
A 72 -page catalog of wire, cableand tubing products, No. W-7, de-scribes more than 7000 productsmanufactured and marketed by thecompany. It includes descriptions andspecifications for products rangingfrom hook-up wire and multiconduc-tor cable to coaxial cable and zippertubing. Among the new products listedin the catalog are heat shrinkable sol-dering sleeves, solid and miniatureTeflon wire and machine tool wire. Atwo -page construction index providesthe reader with a quick reference forlocating the various gauges and com-binations of cables. Alpha.
Sound Systems 402
Techniques and equipment forsound systems in the sports and en-tertainment fields is covered in a 12 -page brochure. The publication illus-trates the equipment used in sportsarenas, stadiums, automobile speed-ways, hotels, restaurants and otherpublic entertainment buildings. AltecLansing Div.
Switch Catalog 403
Information on enclosed push-but-ton and rotary switches and termina-tion hardware is contained in theG -306-A catalog. Among the productsincluded are: decorative push-button
switches (momentary and alternateaction), environmentally sealed push-button switches, key -operated rotaryswitches, a build -your -own rotaryswitch kit, spring return rotaryswitches, and isolated position (pull -to -turn or push -to -turn) rotary switch-es. The engineering data section of thiscatalog provides information on switchparameters. A push-button switchselector chart and a rotary switchselector chart allow you to determinereadily the switch for your applica-tion. Another feature of the catalog isa shortform listing of the manufactur-er's switches. This catalog allows youto pick a qualified switch from a vari-ety of sizes and current ratings for ro-tary switches. Grayhill.
Capacitor Replacement Guide 404
A 24 -page replacement guide forelectrolytic capacitors is being offeredby the manufacturer. It lists originalpart numbers for color and B/W TVsets, and includes cross referenceguides for other manufacturers' prod-ucts. Loral Distributor Products.
1971 Electronics Catalog 405
The 1971 edition of the IndustrialElectronic Components catalog, No.FR -71-1, containing nearly 1700 items,has been released. The 84 -page cata-log has been revised and expanded. Itlists such diverse hardware items asconnectors, adapters, alignment tools,clips, plugs and jacks, binding posts,cable clamps, and cable ties. A broadselection of Nylon and metal mount-ing hardware, printed circuit materials,printed circuit connectors, spacers,switches, test prods, production -typewire strippers, grommets and lacingcords are included. A special appendixin the catalog provides part -numbercross-references to identify parts madeby other suppliers. GC Electronics.
Tools 406
A 100 -page tool supply catalog, No.1170, features more than 375 qualityitems such as cutting tools, hard -to -gettaps and dies, thread plugs and ringgauges, drills, gauges, micrometers andmany more. Rutland Tool & Supply.
Instrument Rental 407
The 42 -page catalog, GEC -155D,1971 edition, lists more than 100 newitems giving the monthly rates and or-dering information for a wide varietyof analytical instruments, electrome-chanical measuring devices, and elec-trical and electronic instrumentationavailable to industry through rentals.Technicians are available to operatethe rental instruments or to conductelectro-mechanical measurements onsite. General Electric.
NOW . . .A NEW BOOK FROM
TV TECH AID
BLACK & WHITETV TIPS
Our new book will contain over 400actual causes and cures for BLACK& WHITE TV and STEREO trou-ble symptoms of all the leadingmanufacturers. Each "tip" will bepresented in a concise, brief formatincluding a clearly marked sche-matic diagram of the associatedcircuitry.We are dealing with "FACTS" . . .
not theory! This book has beencompiled to help you save time, andtime is MONEY. ONLYSend for it now.MONEY BACK 1,5.95GUARANTEE.
TV TECH AIDP.O. BOX 603KINGS PARK. L. I.NEW YORK 11754ENCLOSED IS A CHECK OR M.O. FOR$5.95. PLEASE SEND COPY OF BLACK& WHITE TV TIPS.
NAME
ADDRESS
CITY
STATE .. ZIP
. . . for more details circle 131 on Reader Service Card
for FastHigh VoltageRepairs
Replaceonly capor spring
- )rnoc
GRIDCAPS
Get Telematic'sAnode Repair Kit
Model KV-370contains
anode cups, springsgrid cups, anode wire
30 KV spaghetti
FOR SAFE SURE HIGH VOLTAGEFEPAIRS SPECIFY TELEMATIC'S 30 KV
REPLACEMENT PARTS.
TELEMATIC, BKLYN, N.Y. 11207. . for more details circle 127 on Reader Service Card
FEBRUARY 1971, ELECTRONIC TECHNICIAN/DEALER 67
READERSSERVICEINDEX
133 Mallory Distributor Products Co. 21
119 Ouietrole Company 24
RCA Entertainment Tubes 64
RCA Parts & Accessories 4th Cover
ADVERTISER'S INDEX RCA Picture Tubes 22
122 RMS Electronics, Inc. 68American Telephone and Telegraph 46
123 Sencore, Inc. 28
101 Arrow Fastener Co., Inc. 62124 Sencore, Inc. 65
102 B & K Division Dynascan Corporation 26125 Sprague Products Company 25
103 Belden Corporation 57Sylvania Electric Products 49, 55
104 Book Club-Tab Books 50-53126 Tech Spray 27
105 Centralab, Division of Globe -Union
Inc. 32127 Telematic Division UXL Corp. 67
106 Chemtronics, Inc. 58128 Triplett Corporation 61
107 Chrysler Corp.-Dodge Division 59129 Tuner Service Corporation 19
108 EICO Electronic Instruments Co.,130 TV Tech Aid 65
Inc. 2nd Cover 131 TV Tech Aid 67
109 Finney Co. 31 132 Workman Electronic Products, Inc. 56
110 Ford Marketing Corp. 47 Zenith Radio Corporation 29
General Electric Company 66
111 Grantham School of Engineering 68NEW PRODUCTS
112 Heath Company 63 700 Oscilloscope 30
113 Jensen Tools & Alloys 54 701 Tape Deck 30
114 Johnson Company, E. F. 62 702 AM/FM Tuner 30
115 Kikusui Electronics Corp. 68 703 Attenuator 56
116 Lakeside Industries 56 704 TV Strip Amplifier 56
117 Leader Instruments Corp. 3rd Cover 705 Contact Cleaner 56
118 Lectrotech, Inc. 48 706 CRT Adapter 58
707 VOM 58
708 Signal -Tone Encoders 60
709 Tools 62
710 Car Stereo Tape Player 62
711 Direction Finder Radio 62
712 Antenna Mounting Hardware 65
713 Burglar Alarm 65
TECHNICAL LITERATURE
400 Electronic Parts and Supplies 67
401 Wire Cable and Tubing 67
402 Sound Systems 67
403 Switch Catalog 67
404 Capacitor Replacement Guide 67
405 1971 Electronics Catalog 67
406 Tools 67
407 Instrument Rental 67
TEST INSTRUMENT
900 Heathkit's Model IB-101 frequencycounter 45
Technicians, Earn Your Associate
DEGREEmostly by correspondence
Accredited by the Accdt. Conlin. of National I
Study Council t; 1. 11,11 Approsed Free catalog.
Writ' Dept. TGrantham School of Engineering
1505 N. Western, Hollywood, Calif. 90027. . . for more details circle 111 on Reader Service Card
LOW CM COMIlag OscilloscopeIf shelf space is critical, and budgetsare small -you have 2 reasonsfor choosing aKIKUSUI oscilloscope!1-71/2" high, 51/2" wide,
14" deep
2 -ONLY $16700complete
Compare these features: Solid state circuitry High sensitivity of 20 mv/cm Bandwidth of 1.5 MHz Controls grouped by function
for easy operation AC/DC coupled Flat 3 inch CRT face for sharper
traces 3 step attenuator with variable
control Excellent for lab or field use
li
v1.1 41.1 lore yr.
53oA
TVIVIVog
Model536A
Full line of electronic test instrumentsinclude: trigger, dual trace trigger,alignment and standard oscilloscopes.
Call or write for FREE specification catalog
kikusui Address all Inquiries to Marubeni-lida (America) Inc.
200 Park Avenue. New York. N. Y. 10017
ELECTRONICS CORP. Telephone 212-973.7152
... for more details circle 115 on Reader Service Card
68 ' ELECTRONIC TECHNICIAN/DEALER, FEBRUARY 1971
THE BEST PERFORMING
UHF/VHF/ FM HIGHGAIN 4 -SET COUPLER...
#C-4UV
Couples 4 TV and/or FM Sets to a single antennawith low loss of signal ... minimum interference be-tween sets. Two antennas, any combination of VHF,UHF, or FM, can be coupled to a single down -lead.Penetrating washers eliminate the need to stripwire. Assures simple hook-up of set and antennaleads. Wood screws are provided for mount to backof set or base board of a wall.Model C-4UV Specifications ...Bandwidth 20-890 MHzSplitting Loss 20-220 MHz -7.5 db
450-890 MHz - 11 dbIsolation 20-220 MHz - 10 db
450-890 MHz 14 dbVSWR 20-220 MHz- 2.5 Max.Input 450-890 MHz -3.5 Max.
Also available-model C-2UV 2 -Set UHF/VHF Coupler.Write for Profit Details-
RMS ELECTRONICS, INC.50 Antin Place, Bronx, N.Y. 10462 Tel. (212) 892-6700
. for more details circle 122 on Reader Service Card
A broad new line of exciting, laboratory gradetest instruments from Leader, for servicing allelectronic equipment - priced to give you thebest dollar -for -dollar value - and built to thehighest standards in the industry!Leader's got it in New, Portable Triggered Scopes;Battery Operated Color Bar Gererators; PostInjection Sweep Marker Generators; and lotsmore. Accessories too. Seeing is believing. Sendfor your new catalog. See your distributor.
From left to right here's our180-501-5" Triggered Scope/
Vectorscope $339.50LSW-330-Solid State Post
Injection SwemarGenerator $399.50
LBO -32B-3" WidebandOscilliscope $189.50
LDM.810-Grid DipMeter $44.50
LOTS OF SCOPE ...Here's the only 3" Portable Triggered Scope with vertical andhorizontal calibration! All solid state, it features highest sensi-
LBO-301 tivity, wide bandwidth and an easy -to -use. horizontal panel designfor testing under all conditions. Great for servicing color TV andcomputer circuitry. It's compact, it's portable, it's remarkablylow-priced. $334.50
LOTS OF STABILITY...Our fabulous, new, Mini -Portable Color Bar Generator that's batteryoperated, yet offers test patterns of the highest stability. Features
LCG-384Leader's digital clock and binary system that acts as a miniaturecomputer. Has two switch selectable frequencies, four basic pat-terns including gated rainbow for testing NTSC color sets. Withcarry case, extra battery compartment and all accessories. $109.50
LOTS OF SENSITIVITY...This 5" Wideband Scope features calibrated vertical input, 10MVp-p/cm sensitivity and unstinting operational stability. Bandwidth
L80-5413 is DC to 10MHz and the high linearity sweep range has automaticsynch. DC coupling and push-pull amplifiers help deliver distortion -free displays. $249.50
AND LOTS MORE ...
4111, 111,
41.
.1111 .111.11a a a
Seeing is believing.
enn
TEST INSTRUMENTS37-27 27th Street. Long Island City
New York 11101.Telephone: (212) 729-7410
... for more details circle 117 on Reader Service Card
Cut your timeWith "QT:' The Quick TurnoverParts Inventory System from RCA.How rruch t me do ycu spend in the st-pp search ng forparts? And if you dor't have them how long does ittake 10J to get them?
It doing more than your share o- ooking for partsor ordering them on the phone, %.,o_fre ftvasting time.
Time that's rutting down your eff ciency and preventing youfrom doing tie really important thiras.That's v:here our Quick Turnover Parts Invento-y System
QT for shDrt) car help.It s a system that puts 250 of the fastest rnovinc RCA partsfcr T'/ sets, radios anc phonogravt-s at vour findelips.Parts se ected by RCA's computers.
You'l also k -ow when the supply is runring low. Andst-oulz.: any ct the parts be dropped from the "tcp-mover" list,simpli return them through your -QT" d stributar.Talk tx jour RCA Pals & Accessories Distributor aboutpuffin: n a "QT" Inventory System.
The seer you do the faster you II start saving time.
Parts andAccessories
