the - americanradiohistory.com · 120515c, -16d 120528 trans radio 614 d761-1 928 2007 644...
TRANSCRIPT
The<AbFolute endf 711-; old iear.
ANNOUNCING: The new B&K Sweep/MarkerGenerator. Does for TV sets what no otherinstrument or instruments can do. It makesalignment of color as well as black & whiteTV sets simpler, easier than ever.
We've remembered all your old fears aboutTV alignment. Especially color. So now youcan forget them.
In the past, a marker generator and a separatesweep generator were used with a markeradder and a bias supply. All four of these now arecombined in one easy -to -use instrument.
(We've made benchwork so much simplerby doing away with the need for hooking togethera lot of cables and costly instruments.)
The Sweep/Marker Generator is both aninstrument and a guide. As a guide, the bandpass
and chroma bandpass curves are visuallyreproduced and the individual markers are clearlyindicated by lights-right on the frontpanel-for quick, easy reference.
As an instrument, the Sweep/Marker Generatornot only generates the marker frequencies(all crystal controlled), but also sweeps the chromabandpass, TV -IF, and FM -IF frequencies.
See it soon at your B&K distributor or write usfor advance information on the product thatmakes TV alignment procedures of old a fearlessoperation: simple, fast, accurate. The newSweep/Marker Generator, Model 415.
Generator.
A Division of DYNASCAN CORPORATION1801 W. Belle Plaine Chicago, Illinois 60613Where electronic innovation is a way of life.
. . . for more details circle 103 on postcard
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0A65
590
412-
188
3W
G-6
0508
713
964
944
WG
-605
1871
3E
LEC
TR
OH
OM
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CA
NA
DA
)G
EN
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AL
ELE
CT
RIC
964I
0-1
944
WG
-605
2871
396
413-
194
4W
G-6
150B
713
Cha
ssis
:C
hass
is:
9641
6-I
944
WG
-615
2871
3M
411
85A
A88
9
CO
PY
RIG
HT
196
8 B
Y E
LEC
TR
ON
IC T
EC
HN
ICIA
N/D
EA
LER
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BW
AY
BU
ILD
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H. M
INN
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A 5
5802
SC
HE
MA
TIC
NO
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CH
EM
AT
IC N
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SC
HE
MA
TIC
NO
.
AB
96348 S
eries912
PA
CK
AR
D-B
ELL
AC
116449 S
eries901
AD
114870-01 fM
Multiplex A
dopter702
Model:
AY
832T
907 Series
98123D
C16
748
A-1
1191T
908 Series
993M
PX
1-1 Stereo A
dopter716
CB
953T
910 Series
985M
S1 202
1134
DA
861T
911 Series
1088M
S.1 204
1134
DB
9301914 S
eries954
Chassis:
DC
9901915 S
eries1181
88-9607
DD
1075T
916 Series
114088-16
877
ET
V1046
T917 S
eries1186
88-18C941
FY
866T
919 Series
101288-19
970
G-1
11591920 S
eries1103
98C15
1083
H-1
11731921 S
eries1059
98C17
1131
1011T
922 Series
107298014, C
677
KC
10371923 S
eries1076
KD
1141T
924 Series
1135
KE
1184T
925 Series
1111P
EA
RC
E-S
IMP
SO
N
LW621
T927 S
eries1158
LX699
Model:
MW
717C
BD
-5 CB
Radio
638
MX
T785
MA
TS
US
HIT
A
P-1
OX
QV
SA
1195772828911
Model:
T-35 T
rans Radio
MF
800 Motional F
eedback Am
p
719810
PE
RM
A-P
OW
ER
Model:
G230, 1, 2 R
emote C
ontrol Receiver
80658
939G
340, 50 Transm
itter806
SC
1018G
-500 8 RC
-200 Rem
ote Control
797S
-21155
TA
881M
ON
TG
OM
ER
Y W
AR
DT
B1004
PH
ILCO
-FO
RD
TC
1048M
odel:U
5692
WG
-399A F
M M
ultiplex768
Model:
VB
9791-1720R
Stereo R
everb626
M575
609L-1532 S
tereo Phono
761
M597 S
eries. 745
MO
TO
RO
LAL-1650 S
tereo764
TU
220 AM
/FM
Tuner
759M
-1618 Stereo P
han822
Model:
Chassis:
M-1660 S
tereo Phono
822
940A, B
Radio
858436 S
eries656
NT
-600 Radio
867
11R31, -33, 1225A
, -35A, -36A
Radio
. 845015-436
73101054
1113
CT
110. CP
775 Trans R
adio619
RT
S-436
731R
C -65 R
emote C
ontrol Receiver
737
M502X
BN
, EB
. VY
, 3XE
IN, E
B, V
I772
ST
S -435
614T
-63 Trans R
adio708
M870V
WD
, M871V
WD
, R870V
ML,
ST
S -436
731T
-909 Trans R
adio824
R870V
VID
692T
S -435
614C
hassis:
P970A
.Rodio
809T
S -436
731N
1052935
RP
2060A S
tereo Phono
725T
S -440
700N
1200932
T -3000A
, B S
tereo Receiver
836T
S -454
931N
1204932
W360A
Radio Intercom
796T
S -458
110711H
25613
TS
-460 Series
108911127
613T
5-4611047
11N56
636
GR
AN
CO
TS
-4997S
212127
676T
S -576
68112N
50662
Model:
TS
-S78
16313N
51754
704 AM
/FM
Radio
682T
S -584-05, -H
91313N
52754
TS
-586904
13N53
754T
S -587
91914620
855
GE
NE
RA
L ELE
CT
RIC
(CA
NA
DA
)T
S -588
96414N
30871
TS
-589899
14N50
862
Chassis:
M618
M638
M649
M685
M687
10301171110111231112
TS
-S92
TS
-594T
S -596
TS
-597T
S -611
TS
-908C-02 thru 0-02
TS
-912A
11491031
95710211196
924819
15620905
151251007
15127884
15M91
89815N
30914
15N50
921
16127980
TS
-914A-00 thru A
-07951
161126, A965
HE
AT
HT
S -921 S
eriesT
TS
-587
1147919
16N35
971
16NT
821017
.Model:
AA
-21 Stereo A
nG
R-22
GR
-53
HO
FF
MA
N
Chassis:
913-000366. 386B
P318 T
rons Radio
Model:
P708 T
rans Radio
829773839
1166703
703
VT
S-587
WT
S-435
WT
S-436
Model:
202 Auto R
adio203 A
uto Radio
204 Auto R
adio1T
MC
Auto R
adio2T
MR
Auto R
adio13M
AM
Auto R
adio14M
F A
uto Radio
19P7-1, -2, -3
1915, 7, 11, 12, 13, andA
1918 Series
109 Mop or A
uto Radio 1961
919614731
727727727673691661647700
731
1601851017
17C21, A
, V, A
V1099
171251084
17127, 27A1063
171281096
17K150
101717N
351049
17N145
107818132
1151
18L331130
18LT43
113718N
T45
1125180185/18W
-701118
190185R190185R
Plym
outh664
KO
RT
ING
C2A
A-18806-M
-N A
uto Radio
741
C2Y
A-18806-E
Auto R
adio741
PH
ILHA
RM
ON
IC
Model:
MT
2233, 2243 Tope R
ecorderM
T3643/3633 S
tereo Tape R
ecorder865
RV
2F C
20Z-18875-C
Auto
Radio R
everb723
Chassis:
TS
L-001689
Constellation
853
MU
NT
ZR
AY
TH
EO
N C
O
LAF
AY
ET
TE
Chassis:
Model:
168A14
168A15
940940
Model:
TW
R-1 "R
aytel" Citizens B
and Radio
640
KT
-236 Stereo A
mp
610168H
28947
Raytheon T
wo-w
ay Encoder / D
ecoder .895
MA
GN
AV
OX
OLY
MP
ICR
CA
VIC
TO
R
Model:
Model:
Model:
77-01 AM
/FM
Tuner
7946P
28, 6P29, 6P
30992
193 -A -542 -M
V, M
U730
Chassis:
CT
-9101064
193-A-546-V
M, M
U730
34 Series
722C
hassis:193 -A
-549 -MV
, -MU
730
35 Series
6339P
56, 57, 581095
213 -G -21-M
736
36-02 Series
6729P
59, 601090
213 -G -23-M
736
36-08, -09 Series
762C
TC
19/21 Series
1077213 -G
-23R736
40 Series
849JU
-JCU
710213 -G
-26M736
43 Series
835JW
R671
213 -G -27M
736
44 Series
812N
B820
213 -G -27-R
736
45 Series
882N
BU
820213 -G
-31-M736
47 Series
1062N
OP
1013213 -G
-31-R736
SC
HE
MA
TIC
NO
.
213-G-3
736
213-G-3
736
4VC
6 RP
layer798
4VC
8 Rac
Player
798
4VF
606 Seo H
i-Fi
8274V
F705 S
tH
i-Fi
827K
RK
105/12, K
RK
112 with 962709
IF A
mp K
OS
/KR
K66 S
eries856
MA
RK
11lizens B
ond Radio
645
RE
G35 R
o863
RK
-295 St
Adapter
721
RP
-215-CR
ecord Player
848C
hassis:C
TC
11706
CT
C12, A
,P
, R736
CT
C16, X
885C
TC
17X952
CT
C19
984C
TC
201032
CT
C22 S
1109C
TC
251040
C1C
28 S1136
CT
C31 5
1144
CT
C35 S
eries1132
KC
S130F
, H, K
, M687
KC
S130Y
AB
, YA
C705
KC
S134
627K
CS
136669
KC
S136M
1008K
CS
136 ML S
eries1161
KC
S136X
879K
CS
136Y S
eries744
KC
S137
750
KC
S138
750K
CS
140A, 13
730K
CS
142834
KC
S142X
A982
KC
S143F
906
KC
5144E998
KC
S147A
, B786
KC
S148
927
KC
S149A
A, A
B, A
D942
KC
S151A
917K
CS
152A915
KC
S153
959K
CS
154A, B
948K
CS
155966
KC
51561019
KC
S157 S
eries1116
KC
S158 S
eries1119
KC
S161
1022K
CS
1621028
KC
S163 S
eries1065
KC
S164
1050K
CS
165 Series
1104K
CS
168 Series
1175K
CS
169 Series
1192
KC
S171 S
eries1198
KC
SI 73 S
eries1180
KC
S174 S
eries1182
RC
-1214A R
adio792
RC
-1216 Radio
863R
S -194A
Reverb A
mp
615R
S -200 S
tereo Adapter
721R
S -206-A
Record C
hanger868
RE
GE
NC
Y
Model:
CB
-27 Citizens B
and Radio
6S8
CB
M-27 C
itizens Band R
adio658
SE
TC
HE
LL-CA
RLS
ON
Chassis:
159639
361A629
4011066
SH
ER
WO
OD
Model:
5-3000 111 FM
Stereo T
uner612
SILV
ER
TO
NE
Model:
100961226150
;995
6151995995995
`666111555425995995995
67115106
61576164
1000
102611002266
777111211041
10223368877112221
71281026
71311026
71511098
7152
11100°9988877115
71561098
SC
HE
MA
TIC
NO
.S
CH
EM
AT
IC N
O.
SC
HE
MA
TIC
NO
.
71571098
551, -2, -3, -5, -6, -7680
WE
ST
ER
N A
UT
O
71581098
552-1, -2, -9646
81401, 411, 4211167
558-1, -2704
Model:
Chassis:
562, -3, -4757
DC
3438 Trans R
adio776
456.61580955
577, -1, -2851
4DC
7260A T
ape Recorder
840
456.61581955
584-1 thru 7933
4DC
7465 Tope R
ecorder803
456.70120967
585-1, -2, -4, -5922
456.70121967
682-1, -2, -3 Trans R
adio668
528.61580955
528.61581528.70120
955967
SY
MP
HO
NIC
WE
ST
ING
HO
US
E
528.70121528.70370, 71528.71120528.71150528.72280528.72281528.72282
967113311201138111411141114
Chassis:
TS
L-001
TE
LEC
TR
O
747
Model:
H -790P
6 Trans R
adioH
-791P6 T
rans Radio-
H -883N
29 Radio
H -M
1800, 01, 03 Phono
H -M
1900, 01, 03 Phono
679679846734734
528.72500529.61580
1160955
Model:
215 Tape R
ecorder/Radio
807
Chassis:
V-2393-4 T
rans Radio
679
529.61581529.70120
955967
MM
-214 Tape R
ecorder801
V-2407-4 R
adioV
-2409-1, -2, -3789625
529.70121967
V-2409-4, -5, -6, -7, -8
688
562.10096564.10000
972972
TE
LEF
UN
KE
NV
-2411-1,-9V
-2414-1, -2634660
564.10003564.10000564.10001564.10002564 10003
972988988988988
Model:
77 Stereo T
ape Recorder
5051W C
aprice AM
/FM
/SW
Radio
5061W Jubilate A
M/F
M/S
W R
adio
715674654
V-2417-1, -2, -3, -4, -5, -6
V2436
V2444-1, -2, -3, -5, -6, -9, -10
V-2444-1, -2, -3, -9, -10
V-2446-1, -2, -3, 4
711758795837825
564.10004988
V-2451 2C
B T
ransceiver774
564.10005988
TO
SH
IBA
V-2451-2 C
B T
ransceiverV
-2474-1, -2, -3, -6, -781787S
SO
NA
R
Model:
"6" CB
Transceiver
770
Model:
9TL 3655 T
rans Radio
Chassis:
10PG
685
712
V-2475-1, -4
V-2476-1
V-2478-1,-2
V-2483-1
V2495-11
887900907
1053
961
TR
AV
LER
V-2486 S
eries996
SO
NO
RA
Model:
V-2487 S
eriesV
-2490 Series
10021014
Model:
563P197
S63P
197S
64K236M
565P198
Chassis:
1194-194
852852989
1060
869
GT
C-3014A
, BG
TC
-3114AG
TC
-4014AG
TC
-4044AG
TC
-4054AG
TC
-4114AG
TC
-4144G
TC
-4154A
821821821821821821821821
V-2496 S
eriesV
-2498 Series
V-2515-2 P
honoV
-2515-6 AM
/FM
/Tuner
V-2528-3 R
adioV
2652-2V
2655 -2-3-4-7-8-I3V
2656 -i-2
10231029
734771846
109210581121
Chassis:
V2659 S
eries1143
SO
NY
1051-90642
V-2660
1162
1156-89696
V2664 S
eries1157
Model:
5-303W8-301
751667
TR
UE
TO
NE
ZE
NIT
HT
RW
-621 Trans R
adio
SP
AR
TO
N
690M
odel:2D
C13008
2DC
1300C2D
C1301B
767780767
Model:
40 Radio
Royal 50L T
rans Radio
857781
Model:
12M5 -P
Stereo P
honoC
hassis:19L123K
2
732
765714
2DC
1301C2D
C1302B
2DC
1302C20(130382D
C1303C
2DC
1501A, B
780767780767780894
Royal 150 R
adioR
oyal 490 Trans R
adioC
hassis:1Y
2113556G
T42Z
2 Radio
6.114021 Trans R
adio
635811
1139635720
2DC
1605983
611.41Z1 T
rans Radio
720
ST
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LING
2DC
160520C
180310791110
61(14011 Trans R
adio6K
15018 Radio
781857
20C3555
107971(14511 T
rans Radio
811C
hassis:20C
3651949
8148361145
1/633US
AM
/FM
/SW
Radio P
hono641
20C3712
10731M
30110977
20(37411041
13M15
923
20(38151156
13X15
1034S
TR
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L2003818
112713X
181086
20(38191168
131121176
Auto R
adio622
20039201193
132131187
20(48151178
14120842
Chassis:
14L25838
SY
LVA
NIA
1096-243788
14M20
8931095-232
72914M
211054
Model:
4P19 S
eries Trans R
adio19L17 S
eries21T
C1-C
221LC
3211.C
12-1211(14-123E
0145C
31-1 Stereo
45P36 S
tereo55C
311 S
tereo
668704851851851851757738859738
UN
ITE
D S
CIE
NT
IFIC
LAB
S
Model:
Contact 23 C
B T
ransceiver
UT
ICA
Model:
T8C
11 CB
Transceiver
896
805
14M23
14M27
I 4M32
14N22
14N26
14N27
14N28
14N29
14N29Z
14N31
878916934
1001958
10801010969
1067986
69400 Stereo
73814021
1039
Chassis:
VO
ICE
OF
MU
SIC
14Y21Z
1160
A02-1, -2
99914133
1163
A04-1, -2
1051M
odel:15M
22908
A06, A
071035
725 Tope R
ecorder850
15Y6C
151174
A06-1
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1023. 0616
(1041, -2968
16.12805698
B05-1
-2, -3973
WE
BC
OR
16K20, O
S739
806-1, -2, -3960
16N24
1006
806-1, -2, -3, -4, -51108
Model.
17G28, 0
651
1309-1, -21122
1376 Stereo P
hono795
201.1371126
D01-1, -2
9251377 S
tereo Phono
73523X
C36
1027
001, -1-2,
81043
2207 Tope R
ecorder678
2414(31994
003, -3987
4210 Am
p/Speaker S
ystem749
25MC
30886
DO
51024
25MC
36926
D06-1, -2
1091W
ELLS
-GA
RD
NE
R26K
L20, 2005779
D07-1, -2
111527K
C20, 0
728
D08-2
1154M
odel:291C
20675
D09-1
-2, -41150
20(3144628
5-54344 Hand C
ontrol799
D11-1
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TV
29491628
S-60804, 44, 1024 R
emote C
ontrol799
1-537-5, -6611
WG
4324, 52, S2V
628175-141, -142, -301.
406-3 Stereo
859W
G4424
628-302, -171, -172 T
uner623
CO
PY
RIG
HT
1968 BY
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RO
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1968OSCILLOSCOPE WAVEFORM PATTERNS 19QT85R CHASSIS
These w
aveforms w
ere taken with the receiver A
GC
control adjusted for an approximate peak -to -peak output of tw
o voltsat the video detector, using an air signal. D
o not reset AG
C control w
hen using color bar generator. All m
onochrome voltages
taken with average air signal and all chrom
a voltages taken with a color bar generator connected to the antenna input ter-
minals. T
he chrome peak -to -peak voltages w
ere taken with the chrom
a control set for 0.5V peak -to -peak at P
in 2 of V40 and
the tint control set for proper color bars (approximately m
id -range), all other controls set for normal V
iewing. T
he frequenciesshow
n are those of the waveform
snot the sw
eep rate of the oscilloscope. All voltages taken w
ith a wide band scope having
a 5MH
z bandwidth sim
ilar to B &
K M
odel 1450.
volts p/p 60cps2 voltsp'p. 15.750
Ai 65 volt a W
I,(031. contr..)
cps
(enlt p/p`11. 15.750 cps
O%
fl", %°z,(00.,;.
130vocp1volt. p'p.
60
ak140 volts R
P.W
15.750 cp.'
svolt.
pop.
W 15.750
cs
OSi;'V
)
II vells p/p,W
1.58 me
1V
570 volts PP
15.750 cps
30volts
i7
0 14 vo1p/p.
60op.
8015 7'5'0" c.x. PsP
IAN
in,13 voltsp'p.
IP15,750 cps
91201:
7-5.". ,`"
0 volts 9/p.15,750 cp,
Ai 40C
volts
p p.W
15.750 cps
-035 volt,
pp.15.750
cp.
W96g0cp"'sl(s.pPIS:iISO
volts p/p,60 cps (..,tooth)
0 17,0570050
cp18 s p'p.
a 20volt. p/p.
IP15.750 cps
050 voila
pp.cp585.750
080volt.
p/p.15.750 cps
r
Ah 310 volts p p,
15,750 cps
00.2volts p p.
15,750 cps
711VT
fk
ittt
050
01tsc:5P.15.750
,---^ c-,
li
JVI
08.5
volts0i5.
cps
015.710 cps loosecoupled
090
,(/1,17t, sp0/)p.
70 V.
p/p, (sync)13.790 cps
50
sy olts p.
. 7s oop.
O 135
volts p/p.
15,750 cps( m
ax.est 1
2111 volts pip.15.700 cps
SSIS.v7oslot sopp.p.
((0 17150.70501 t sepp/5p.
Ai12 volts p/p.
41. 3.58 me
30 volts p p.(chrom
e)70 V
. p/p. (sync)15.750 cps
17volts P3.58 m
c
13:Ts,:
1
25
Volts
0.'U
r5. 750 C
ps
45voltst
o
50opt
0 V,
02-5 volts p P.15.750 cps
O135 V
p -p.
(max
von15.750 cps
039 volts p/p.69 cps
\j
050 volts
ppsp.,5i
60 volts p p.W
15.750 cps
85 volts p/p.2
volts
p.p.
chrome)
70 V.
p'p.( sync)
5 V. pop.
( sync)15.750 cps
15.750 cps
14050601:n: p p .3.
I028volt,
p/p.15.750 cps
09 ;01,t8,
volt.P
64105. ivsoolt.spp.' p.
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Nine -seventy-five buys you a complete tuner overhaul-in-cluding parts (except tubes or transistors)-and absolutelyno hidden charges. All makes, color or black and white.UV combos only $15.
Guaranteed means a full 12 -month warranty against defec-tive workmanship and parts failure due to normal usage.That's 9 months to a year better than others. And it'sbacked up by the only tuner repair service authorized andsupervised by the world's largest tuner manufacturer-Sarkes Tarzian, Inc.
Four conveniently located service centers assure speedyin -and -out service. All tuners thoroughly cleaned, insideand out ... needed repairs made ... all channels aligned tofactory specs, then rushed back to you. They look-andperform-like new.
TSC
EFFECTIVE I/1/81
MINEN
Prefer o replacement') Sarkes Tarzian universal re-placements are only $10.45, customized replacements$18 25 Universal replacements shipped same dayorder received. On customized, we must have originaltuners for comparison purposes, also TV make, chas-sis, and model number. Send orders for universaland customized replacements to Indianapolis
Intermediate AF Amp Ose. MixerPart # Frequency Tube Tube Heater
MFT-141.25 mc Sound45.75 mc Video 6GK5 61_18 Parallel 6.3V
MFT-2 41.25 mc Sound45.75 mc Video 3GK5 5118 Series 450 MA
MFT-3 41.25 mc Sound45.75 mc Video 2GK5 5CG8 Series 600 MA
Genuine Sarkes Tarzian universal replacement tuners withMemory Fine Tuning-UHF Plug in for 82 -channel sets-Pre-set fine tuning -13 -position cletent-111 gain-Lo noise-Universal mounting
FOR FASTEST SERVICE, SEND FAULTY TUNER WITH TV MAKE, CHASSIS,AND MODEL NUMBER, TO TUNER SERVICE CENTER NEAREST YOU
TUNER SERVICE CORPORATION FACTORY -SUPERVISED TUNER SERVICEHOME OFFICE, MIDWEST 817 N. PENNSYLVANIA ST., Indianapolis, IndianaUNDER NEW MANAGEMENT, EAST 547-49 TONNELE AVE., Jersey City, New Jersey
SOUTH-EAST 938 GORDON ST., S. W. Atlanta, GeorgiaWEST SARKES TARZIAN, Inc. TUNER SERVICE DIVISION
10654 MAGNOLIA BLVD., North Hollywood, California
TEL: 317-632-3493TEL: 201-792-3730TEL: 404-758-2232
TEL: 213-769-2720
DECEMBER 1968 19
MALLORY Tips for Technicians IfA-
"Trading up" resistorsprevents call-backs
2.0
1.5z u
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E
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4 watt 10K ohms MOL:
Load Cycled 1% hours on, % hour off
2000 4000 6000HOURS
8000 10,000
Typical stability test data: 10,000 -hour load cyclingtest. Average resistance change is less than 1%!
Color television sets contain some potential troublespots for fixed resistors. Sudden overloads or short -outs of a tube, diode or transistor, or leakage in aby-pass capacitor may cause enough current surge ina carbon resistor to cause it to open or to suddenlyincrease in value. You wind up with a strange set ofsymptoms that take a lot of point-to-point testingto unscramble.EXAMPLE: Suppose a tube or capacitor shorts out.This may cause excessive current drain on the powersupply which may affect a resistor in the bleedernetwork. This resistor may increase in value whichwould then reduce voltage in subsequent circuits.When this happens, a number of controls must bere -adjusted. By replacing the resistor with a MalloryMOL, the set is brought back to normal operationand the MOL construction virtually precludes thistype of difficulty happening in the future.Granted, resistors don't fail as often as other com-ponents. But when it happens, you can take out asimple insurance policy against call-backs by replac-ing faulty carbon resistors with Mallory MOL's. Forjust a few pennies more, you're putting a world ofextra life and stability in a critical part of the circuit.
In a nutshell, MOL's are metal oxide film resistorswith stability comparable to wire -wounds, but farlower in cost. They can stand brief overloads ofseveral times rated wattage without damage. Humid-ity and vibration don't bother them. They're non -inductive up to 250 mc, so you can use them in rf andif sections without a worry. As for stability, we'verun them on load cycle tests up to 10,000 hours andresistance values hold steady within 1%! No wonderevery major TV manufacturer is using them.MOL resistors are usually a bit larger than carbontypes, so you may have to bend a few leads to fit themin. They come in 2, 3, 4, 5 and 7 watt sizes (which ismore than you'll need in most carbon resistor replace-ments), in resistance values up to 500K.Your Mallory distributor stocks MOL's in the valuesyou'll need. And he has an up-to-date cross-referencelist which shows you the Mallory part numbers tospecify for popular TV sets, by manufacturer andchassis number. See him, or write to Mallory Dis-tributor Products Company, a division of P. R.Mallory & Co. Inc., Indianapolis, Indiana 46206.
DON'T FORGET TO ASK 'EM 2-1a4le eide oteedd 7 ". for more details circle 119 on postcard
20 ELECTRONIC TECHNICIAN/DEALER
HE CH "SCUIT1"V1 Al.E.1CF
Pohlishur
P %I I. DORM EILEEditor
JOSEPH /Al 11.1RI eLhnital Editor
111R I IN P1)1.1.1field I ditoi
BARBAR BE RNSONProduction EditorKt. N NIcSH
\ ri I duo!
K!. 1H CI LINE 11( chill ion \ Linage!
JOHN KESSLER\ lnager. Reader Set ..ices
.II. D1 1\d, cu using I'taductiun
(;1-11-.R.11 OFF I('ES
t Mtiv.aN BuildingDuluth. 11 inn. c6802
Phonc t 218 /21-x5I clec: 029-441'
1)1- 'S111 lilt 11I'rcvdeni
JOE: 11 ()LK INCxectitiNe \ let President
RICH SRI)I Fe.iskiie
BEN 'HARSH1 ice I tusidcnl, Edit°, tal
H %RR), RANI %LEN11c1: Pi csitium, Production
LARS FIADNIARItice President, C oeulation
J 1111.1S C,H ERN 1Sr( Dilectot
1111.1.1.111 1. S11 AINManager. Sales Promotion
11 %RM.:1 BODINAd Production Supen.isot
\1.11 YORK OFFICES'I Vanderbilt -1,e
Nev, lurk. Ni 1 1001'Phone. 2121 6S6-222220(1
RICHARD C. REINHARIV11 ice /'resident
JEROLD 111.001111.01.1g,r, ev, 1 ork II
CHICAGO OH. ICES41 Eest Ohio Street
( hicach). Illinois 6061 IPhone 1121 467-0670
Icle\:(2-01549111.)11 (att. Nt.1
President
1)()R() I H1 BOLAS1,11.tgc ( tucago Itticc
NIARKVIING REPRESENTATI1 ES
h wag('3 121467-0670HIGH SCOTT/"' 11 11.I.ACE
'se" irk 1212216X6 -2_2(K)H 11201.1) 1. LIF BER
I us ngeles: (2111 s'2-15'2IHYS ,\II) I). 11101. 51(S
I ok, o, Japan( .P.O. Roc I 'I 7
ROBERT l InION
ELECTRONICTECHNICIAN / DEALERDECEMBER 1968 VOL 88 No. 6
37 APPROACH TO CIRCUIT ANALYSISThe material presented in this article is designed to help a technicianget a better circuit understanding by reviewing the simple step-by-stepprocedures of reducing even complicated circuits to easily analyzedequivalents
43 LET'S EXAMINE SYLVANIA'S 'GIBRALTAR'COLOR TV CHASSISThis month's teklab report covers the latest in advanced solid-statedesigns for color TV as this chassis features new plug-in transistors forease of service with an explanation of the various circuit stages
48 TESTLAB REPORT ON SENCORE PS148The PS148, a combination vectorscope/oscilloscope, is one of the mostversatile test instruments available to service technicians and our Elec-tronic Technician/Dealer lab technicians explain why.
50 BREADTH, NOT DEPTHOne of the best ways to increase sales is to use effective display strategyand create good customer relations according to a midwest dealer
53 SELLING AND INSTALLING MATV SYSTEMSPart six of this informative series provides a complete listing of MATVproducts and manufacturers with a plain language explanation of eachdevice and its function
22 EDITOR'S MEMO24 LETTERS TO THE EDITOR28 TECHNICAL DIGEST50 DEALER FAX58 DEALER SHOWCASE62 COLORFAX
64 NEW PRODUCTS68 1968 ARTICLE INDEX71 NEWS OF THE INDUSTRY72 CATALOGS & BULLETINS74 ADVERTISERS' INDEX75 READER SERVICE CARD
COVERSanta Claus may not bring you all the goodies you want, but service -dealers and manu-facturers have them available to you and your customers in every size, shape and price.
TEKFAX 16 PAGES OF THE LATEST SCHEMATICS Group 196
AIRLINE: TV Model GEN-13469AGENERAL ELECTRIC: TV Chassis P-1MOTOROLA: TV Chassis TS11 SeriesPHILCO-FORD: Color TV Chassis 19QT85RRCA VICTOR: TV Chassis KCS171 Series
ELECTRONIC TECHNICIAN/DEALER is published monthly by Ojibway Press, Inc., OjibwayBuilding, Duluth, Minnesota 55802, a subsidiary of Harcourt, Brace & World, Inc. Sub-scription rates: One year $5, two years $8, three years $10, in the United States andCanada. Other countries: One year $9, two years $14, three years $18. Single copies 600.Second class postage paid at Dansville, New York and at additional mailing offices. Copy-right 1968 by Ojibway Press, Inc.
POSTMASTER: Send Form 3579 to ELECTRONIC TECHNICIAN/DEALER, Ojibway Building,Duluth, Minnesota 55802.
DECEMBER 1968 21
ALIGNMENT OSCILLATORSDESIGNED TO MAKE SERVICING EASIER
BOTH NEW FROM INTERNATIONAL
MODEL 812(70 KHz - 20 MHz)
The Model 812 is a crystal controlledoscillator for generating standard
signals in the alignment of IF andRF circuits. The portable design isideal for servicing two-way radios, TVcolor sets, etc. This model can bezeroed and certified for frequencycomparison on special order. Individ-ual trimmers are provided for eachcrystal. Tolerance .001%. Output
attenuators provided. Battery oper-ated. Bench mount available.
Complete (less crystals) $125.00
Write for catalog
MODEL 814(70 KHz - 20 MHz)
The Model 814 is identical in size tothe 812. It does not have individualtrimmers for crystals. Tolerance is
.01%. Battery operated. Bench mountavailable.
Complete (less crystals) $95.00
AI ..41WGINTERNATIONAL
Both the Model 812 and Model814 have positions for 12 crys-tals and the entire frequencyrange is covered in four steps.
CRYSTAL MFG. CO., INC.10 NO. LEE OKLA. CITY, OKLA. 73102
. . . for more details circle 113 on postcard
EDITOR'S MEMO
We Thank YouIt's the end of another year. It has
been a year that has seen changes inthe technician's status, changes in thestate-of-the-art and changes in qualitycontrol. Most have been for the better,but there is still a long way to go in allthese areas. We know it and you knowit -but most of all, industry knows it.
During the past year we have cov-ered test instruments, solid-statedevices and technology, TV, radio,stereo and many other fields of inter-est. The continued excellent coopera-tion from the manufacturers in ourrapidly advancing industry can onlymean greater service to you next yearin terms of more and better coverageof the latest circuit designs. This in-cludes continued review of test instru-ments with timely circuit modificationsand service hints in the Testlab report,Colorfax and Tech Digest sections.
In 1968 we featured over 70 circuitdiagrams of television receivers andmore than 100 technical articles oneverything from burglar alarms to FMstereo equipment. As the inevitableadvances in the state-of-the-art makenews in 1969, we welcome the oppor-tunity to keep you the best informedreaders in our industry.
The A to Z Semiconductor series,which concluded in November aftermore than two years running, receivedoverwhelming response and proves theinterest of our readers in keeping upwith the latest in technical advances.
It is our job to bring these advancesto you. It's a job that takes the cooper-ation of a great many people - includingyou, our reader. On behalf of our pub-lisher, Hugh (Scotty) Wallace, ourtechnical staff headed by Joe Zauhar,and the many others whose diligentefforts have made ELECTRONIC TEcii-NH:IAN/DEALER one of the most wide-ly read technical magazines in its field,I wish to thank our readers, especiallythose who took the time to write us,and the many technicians, dealers andmanufacturers who contributed theirtime, their patience and their equip-ment for cover photos, business profilesand technical features.
MOVING?Be sure to let us know yournew address. Please enclosea complete address labelfrom one of your recentissues.
22 ELECTRONIC TECHNICIAN/DEALER
Zenith Tubes...life -tested for greater dependability!
Exciting Surprisesfor You-
and Your Family!Fun for all!
Get the detailsat your ZenithDistributor's
Parts Department.
*Mg
ZENITH TV PICTURE TUBES are rigor-ously tested at elevated line voltages forlengthy periods. Just one reason you can besure of Zenith's great reliability and longlife that better satisfies your customers.More than 200 Zenith quality tubes-forcolor TV, black -and -white TV, or specialpurposes-are in the complete line.
ZENITH "ROYAL CREST" CIRCUIT TUBESundergo over 11/2 million hours of life -testing every month. Under actual operat-ing conditions, they must meet the samequality standards as Zenith original parts-to perform with unrivaled dependability.Choose from a full line of more than 900top-quality Zenith tubes.
Order all genuine Zenith replacement partsand accessories from your Zenith distributor
Zenith B&W replacement picture tubes aremade only from new parts and materials ex-cept for the glass envelope in some tubeswhich, prior to reuse, is inspected arid testedto the same high standard as a new envelope.Some color picture tubes contain used ma-terial which, prior to reuse, is carefully in-spected to meet Zenith's high quality stand-ards.
BEST YEAR YET TO SELL THE BEST
The quality goes in
before the name goes on
DECEMBER 1968. for more details circle 132 on postcard
23
FASTCOMPLETE SERVICE
ON ALL MAKES01 TUNER'
Max n Shop 24 Hrs.
(WE SHIP C.O.D.)
$9.95
8CWhit
or Color
VHFUHF
UV Combo's $16.50
Price includes all labor and partexcept Tubes, Diodes & Transistors. If combo tuner needs onlone unit repaired, disassembland ship only defective unit.Otherwise there will be a chargefor a combo tuner.Ship tuners to us complete withTubes, Tube Shields, Tuner Coveand all parts (including) anbroken parts. State chassis,model number and complaint.
4 fg
. ..\
All tuners are serviced by FAC-,TORY TRAINED TECHNICIANSwith years of experience in this,
specialized field. All tuners areALIGNED TO MANUFACTURERSSPECIFICATION on crystal con-trolled equipment and air checkedon monitor before shipping toassure that tuner is operatingproperly.
GEM CITY TUNERREPAIR SERVICE
Box 6D Dabel Station
2631 Mardon Drive
Dayton, Ohio 45420
for more details circle 112 on postcard
LETTERS
TO THE EDITOR
Schematics WantedI need a schematic for a Pentron
tape recorder about 10 years old usinga 6X4, 6AQ5 and three 12AX7 tubes.This may be a 9T-3.
S. GLADSTONEMac's Radio & TVSpringfield Gardens, N.Y.
I have an old tube tester for whichI cannot obtain recent roll charts. I
would appreciate it if any of yourreaders can help me. It is a SimpsonModel 220.
EMIL YUHASZLajord, Sask.Canada
I would like to obtain the address,schematic or any other information ona Model A-460 TV field strength metermade by the Approved ElectronicsCorp. of N.Y. We thoroughly enjoyyour magazine and especially some ofyour business articles.
ROBERT W. JENSENBox 43Orient, Iowa 50858
I have a DeVry 5in. oscilloscopewhich I am willing to sell before mov-ing. I would appreciate it if you wouldmention it to your readers.
H. SCHUH135-09 83rd Ave.Kew Gardens, L.I., N.Y. 11435
I am in desperate need of a sche-matic for a Videola 1560/1561 madeby Tech Master Corp. which used tobe in Brooklyn. I wrote the firm and itappears that it has either moved orgone out of business. I will appreciatewhatever assistance you can give me.
GONZALO BORREROEchegaray B-40Litheda Hgts.Rio Piedras, P.R.
PropagandaIn reference to the letter "Sample
Budget Can Ruin Us" (ET/D, Septem-ber 1968), students are made to believethat there are promising careers in elec-tronics because of the propaganda adsput out by big companies.
There are not many good paying jobsin the field. Most employers will notpay a good wage unless it is in a salaryposition where the hours are unlimited.
The companies that do pay well areunder government contracts and jobsecurity is nil.
In this rapidly changing world, tech-nical jobs are increasing and thenumber of good technicians is declin-ing because of the low pay scales.Students considering an electronicfuture should be told the facts.
J. L. SOUDERSEaston, Pa.
Short CircuitI have subscribed to your magazine
for about 14 years, living in hopes itwould get better. You have taken upspace telling how to service air condi-tioners, electronic ovens and otherthings. Then in later issues you comeout and say we service men should staywith TV, radio and stereo. Please makeup your mind.
Also, the Apprentice and the Proarticle-disgusting. I imagine a TV setwould scare that author into shock.Your schematic coverage is also offbase, they never show the tuner on it.Believe me, we have tuner troubleshere and some information would behelpful. Your articles about transistorsare of little value to the serviceman. Itis written too far above the technicianshead. Engineers and scientists are theonly ones who could understand theformulas.
I only renew my subscription to putyour magazine in the shop and forpeople to look through. It will scarethem and keep them from working ontheir own sets. Besides, the subscrip-tion is tax-deductible.
JOHN E. BEALAlney, Ill.
I congratulate John Beal on hisfortitude. Fourteen years of subscrip-tion to a magazine just to fill up spacemust be some kind of record.
However, for Beal's benefit, in thelast 10 years we did only one article onan oven. That was in 1959 when a newtype of appliance called the "electronicoven" came on the scene. It was newsthen.
As for the "Apprentice and Pro"articles (the last one in August 1967),they were written to aid the novicetechnician with a few basic tips inservicing. The articles were very wellaccepted according to all the letterswe received-with the exception ofBeal's.
The transistor articles Beal speaksof are the A to Z semiconductor serieswhich has been continued with over-whelming success for more than twoyears. The series started with basictransistor theory and worked up to thepresent technology of solid-state powersupplies. Beal indicates that the series
24 ELECTRONIC TECHNICIAN/DEALER
There's nothing wrong with the set.
O
You fixed the picture a week ago, now you're back repairingyour repair job. And.paying Par it.
Replacement parts are supposed to last longer than that.Like electrolytic capacitors. If they're wound in computer -
grade, 99.99% pure aluminum foil, they'll hold up for a longtime at continuous temperatures of 85 C.
Like Arcolytic capacitors do.Even though they cost the same as any other home enter-
tainment capacitor. And come in more than 2000 exact re-placement values to maintain the set's stability.
Any Arcolvtic distributor can fill you in on the whole line of
Arcolytic types-twist mounts, printed circuit twist mounts,tubular electrolytics (including very high capacitance values)and miniature tubulars in the smallest physical sizes. He canalso sell you Elmenco capacitors.
Then you won't have to do repair jobs twice. If the lady in.the set seems to be missing something, a week after you'vedone a repair job, it's her problem. Not yours.
Loral Distributor ProductsA DIVISION OF LORAL CORPORATION LLD -502
Pond Hill Industrial Park, Great Neck, New York 11022. . . for more details circle 118 on postcard
DECEMBER 1968 25
SPRR-
NEEnon-drift tunercleaner
specificallyformulated
by forco or
tuners
CATALOG No. 8888Suggested Net $1.95
Only SPRA-LUBE safely cleans away all oxidation, dust anddirt, dries quicker, will not harm plastics, and leaves afine, light protective lubricating coating essential to keep-ing color tuners in peak operating condition. Often imitated, never duplicated ... SPRA-LUBE is the one provencleaner -lubricant for all color TV tuners, the only productin its field carrying the proud CC label, your assurance ofquality in electronic chemicals.
Always insist on GCyou'll get more for your money, evervtime!
GC ELECTRONICSA DIVISION OF HYDROMETALS. INC.
MAIN PLANT ROCKFORD ILl.u.S.A.GCELECTRONICS
Giant FREE Catalog...Only CI gives you esrervihing m Piet trorms
has 0,r Arnie t 40 year. Matt h everypart and e nrtli Iron, .,,or 10,000
quality / hrns or new today'
GChas
everything
in
CHEMICAliS
TUNERLIJIIFor quiet TV Waroperation.
No. 26-01-S144 oz. TubeSuuested Net .9110
MT'
0C -Z, Siliconeheat sink compoundCat. No. $109 ...1-0z. Tube
EPDXY GLUE"Super Grip" ... NASAApproved Cat. No. 347
. 2 -Tube KitSuggested Net $2.50
LETTERS
TO THE EDITOR
is over a technician's head and writtenfor engineers and scientists. With suchstatements. we can only guess at hisintelligence and training-an unfor-tunate situation and probably one ofthe reasons why many techniciansworthy of their profession have had tosuffer the abuses of a disgusted andapprehensive public.
But then, it's gratifying to know thateven the "technicians" operating onthe edge of total technical ignoranceget some good from a trade publica-tion-even if it's only to fill emptyspace.... Ed.
Retirement SaleI have been in the servicing business
since 1937, a long time subscriber to -ELECTRONIC TECHNICIAiViDEALER,and now I am getting to the age whereI must think of retiring. I have alreadygiven up my two-way radio business. Iwould appreciate it if you would letyour readers know that I have sometest instruments for sale. I have aLampkin frequency meter, Lampkinmodulation meter, grid -dip meter,crystal cabbrator, power supply anddummy antenna.
JERRY JACKSONJackson Radio & TVParis, Ky.
Wanted To Buy and Sell1 have a Webcor tape recorder in
need of repair. I wrote to the Webcoraddress listed on my schematic but gotthe letter back stamped "moved -noforwarding address." Can any of yourreaders tell me where I might obtainparts for this unit?
I would also like to purchase a usedB&K Model 445 CRT Checker. Per-haps one of your readers has one tosell. Here in Europe I service onlyB/W TV sets, so I don't need the moresophisticated units for color. Any helpwould be appreciated and keep up theexcellent work.
SSCT. JOHN P. DINGES, JR.Box 2081APO, New York 09130
Comments from our readers
are always welcome. Address
your letters to:
The Editor
ELECTRONIC TECHNICIAN
Ojibway Building
Duluth, Minn. 55802
26
. for more detai s circle 11, 1 on postcar
ELECTRONIC TECHNICIAN/DEALER
Only Ford's E-300 EconolineVantakes 3590-1b. payloads...650 lb. more than any otherVan!Ford Econoline Vans come in threepopular series, the E-100, E-200 andE-300. Their higher capacity axlesand heavier construction let youcarry more weight every trip. TheE-300 SuperVan handles from 650 to1350 pounds more payload than anyother van of this type. And that'snot all! The Econoline's long 1051/2 -in.and 1231/2 -in. wheelbases plus over51/2 -ft. wide stance provide 39%more resistance to wind wander.Your power choice goes from thethrifty 170- or 240 -cu. in Sixes upto the responsive 302 -cu. in. V-8.And a compact, factory -installed AirConditioner is now optional foroptimum cooling. A special insulationpackage and tinted glass arealso offered!
Only Ford gives you Twin -I -Beamriding smoothness. The unique front
end madefamous inFord pick-ups. Twosolid I -Beam
axles for strength and coil springs foreasy ride-the most rugged inde-pendent suspension yet!
Only Ford gives youan outside servicecenter. Just lift the"mini" hood foreasiest possiblechecking of oil, water,battery and wind-shield washer water.
Here also is the brake master cylinderand voltage regulator!
Only Ford gives you over 38 sq. ft.of clear floor space -23% to 32%
more than others.Engine has beenmoved out of load -space. The result ismore clear floorarea, 81/2 ft. long instandard van andover 10 ft. in the
SuperVan. Items as long as 13 ft. fitbeside the engine box.
n31
Only Ford gives youdriver "walk-thru"to the rear. Nolonger do you needto step outside toreach the load com-partment. Enginecover is flat withraised edges for useas a package tray.
See your Ford Dealer!
FORDECONOLINE
VANS
. . . for more details circle 110 on postcard
27
TECHNICAL DIGEST
GENERAL ELECTRICCurrent Portable TV-Quadrature Coil Tuning Capacitor
The quadrature coil tuning capacitor used in all currentGeneral Electric portable television receivers has a negativetemperature coefficient to compensate for temperature -produced drift in associated components. The schematicdesignations, by chassis, for this capacitor are:
S-2 Chassis - C308 H-2 Chassis - C307P-2 Chassis-C308 G-1 Chassis - C307V-2 Chassis -C308Should this capacitor not track properly with tempera-
ture, the audio may distort with temperature changes.The audio may be good initially and become distorted
in a few hours or it could be poor initially and gradually getbetter as the receiver reaches normal operating temperature.
When making repairs in any receiver using a quadraturegrid audio detection system, it is good practice to check theaudio quality at two temperature extremes-when the re-ceiver is cold, and after it has reached normal operatingtemperature. If the audio is distorted at either of these points,it is possible that the capacitor is not tracking correctly andit should be replaced.
Replacement capacitors must have the proper tempera-ture coefficient to insure reliable receiver operation. In thecase of the chassis listed, the capacitor should be 18pf, 10%,N470 (Cat. No. ET18X399).
After replacing the capacitor, the quad coil should berealigned and the receiver rechecked at both temperatureextremes.
TV Chassis V -VHF Tuner 300$2 lead dress
The 30012 twin lead which connects the VHF tuner in-put terminals to the antenna input terminal board can con-tact power resistor R401 if not properly dressed.
Heat from the resistor could melt the insulation on the30052 lead, causing a short from 120vac to the monopoleantenna assembly.
0
o TERMINAL
WRONG BOARD
DRESS
1r)
POWER
q RESISTORR401
TOOCLOSE
° TO R401('-.0 LEAD
6 6 REAR VIEW° ANTENNA
VHF TUNERINPUT
300nANT.0 /
LEADe.
DRESSED
" AWAY FROM0R401
PROPERDRESS
Refer to the drawing and dress the 30052 lead well awayfrom R401, as shown, before the back of the receiver isreassembled.
Check this lead dress whenever a "V" chassis receiveris serviced. Models included in this chassis line are M106,M107, M108, M138 and M140, containing VC chassis,V-1 chassis or V-2 chassis.
TV Chwis SB/SC-Lightning Protection
Starting with chassis stamped EN75, the SC chassiswill incorporate a 4a fast blow fuse (ET 10X52) in serieswith the ac line ahead of C410. This provides lightning pro-tection for C410 even when the set is off. (This is in additionto F401 1.5a fuse already in the set.)
F4015401 1.5 AMP
C4 1 0 R4 0 1.1 5 II
6 0 0
Schematic for SB and SC Prior to EN75
ET10 X52F4 0 2 F4 0 1
4 AMP FAST BLOW 5401 1.5 AMP
C4 1 0 R4 0 1
1 .1 6 0 0 V T 5n.
SC Schematic-EN75 and later
This feature should be added to every SB and SCchassis stamped below EN75 that comes in for service. Themodification is simple and takes only a few minutes, sinceonly the cabinet back needs to be removed. Your customerswill appreciate this added protection.
Modification Procedure:
Unsolder end of C410 from circuit board beside smallinterlock pin. Unsolder brown wire to S401 from circuitboard beside small interlock pin. Clip pigtail on one end of5a fuse ETIOX52 to 3/16in. long and install as shown inhole where brown wire was removed. Solder in place. Clippigtail at top end of R402 to 1/tin. length. Splice the brown
CIRCUITBOARD
BROWN WIRETO 54 0 1
Configuration before Modification
28 ELECTRONIC TECHNICIAN/DEALER
What's in a name?All -Purpose PrimerAll -Purpose Silicone SprayAnti -Rust WaxAuto Body Under CoaterAutomatic Choke CleanerAutomotive Acrylic SprayAutomotive Trunk PaintBattery ProtectorBelt DressingCar ColorsCleaner and DegreaserCrystal ClearDamar VarnishDecorator Spray PaintDulling SprayElectric Motor CleanerEngine Spray Paint
Glowing FluorescentSpray Paint
Heavy Duty Silicone LubricantHide -a -Mark Spray CoatHigh Gloss VarnishHigh -Heat Spray PaintHot Rod PrimerInsulating VarnishLet -Go Super Penetrant
and Rust SolventMatte Finish
Open Gear LubricantPaintable Silicone Mold ReleasePressure -Sensitive Spray AdhesiveRetouch VarnishRust Magic® Metal PrimerSatin Finish VarnishStencil Ink SpraysTuner Cleaner and LubricantWorkable FixatifZinc Chromate Primer
Krylon® protective spray coatingsand paints are used by more artists,electricians, radio/TV technicians,automotive mechanics andmore men in industry thanany other brand.
DECEMBER 1968... for more details circle 105 on postcard
29
monitor
The RCA WV -503A 240 -Volt Power Line Monitor is thebig brother of the WV -120A. At a glance, it provides acontinuous, accurate indication of the AC line voltagefrom 200 to 280 volts. Used in conjunction with a variableisolation transformer, it is an invaluable aid in selectingline voltages for TV servicing, test equipment calibra-tion and the operation of electronic equipment that re-quires a known line voltage supply. ONLY $18.50.*
Iisog
AAo 120 730'
ItsA( (111115) VOLTRGE
POWER on( MORITOR
The RCA WV -120A Power Line Monitor is designed foruse by radio -TV repair shops, labs, and industries whereit is important to know the power line voltage at all times.Used in conjunction with the RCA WP -26A Isotap isola-tion transformer on a 50-60 cycle power line, it is aninvaluable aid in selecting line voltages for TV servicing,test instrument calibration, and in the operation of elec-tronic equipment that requires a known line voltage sup-ply. AND IT'S ONLY $18.50.*
The RCA WP -26A TV Isotap is a higher rated version ofthe popular and reliable RCA WP -25A. It is designed foruse as either an adjustable isolation transformer or asan adjustable autotransformer to facilitate testing andtrouble -shooting of radio and TV receivers. It is particu-larly useful in the service shop for duplicating low orhigh supply -line voltage conditions often found in thehome, and in checking operation of the oscillator sec-tions of TV receivers. ONLY $40.00.* The WP -25A is stillan excellent buy at only $27.50.*
*Optional Distributor resale price.
For a complete catalog of descriptions and specifications for allRCA test equipment see your RCA Test Equipment distributor or writeRCA Electronic Components, Commercial Engineering, DepartmentNo. L46 WA, Harrison, N.J. 07029.
1ELOOK TO RCA FOR INSTRUMENTS TO TEST/MEASURE/VIEW/MONITOR/GENERATE
30 ELECTRONIC TECHNICIAN/DEALER
The RCA WT -509A Picture Tube Tester is a precisioninstrument in the famous RCA tradition. It tests bothcolor and black and white picture tubes for emissionquality, interelectrode leakage, and shorted ele-ments. It's all solid-state AND IT'S ONLY $118.00.*
The RCA WR-64B Color-Bar/Dot/Crosshatch Gen-erator has for years been the finest instrument of itstype. Exceptionally stable, portable, it's a precisioninstrument designed for use in the laboratory andfactory as well as for servicing on -the -bench and in -the -home. AND IT'S ONLY $129.00.*
The RCA WR-502A "CHRO-BAR" color -bar genera-tor has even more features than the famous WR-64B.It's all solid-state, battery operated. It provides colorbars, dots, crosshatch, vertical lines, horizontallines, blank raster. It has rock -solid stability. All newcircuit design.THE "CHRO-BAR" IS ONLY $168.00.*
*Optional Distributor resale price.For a complete catalog of descriptions and specifications for allRCA test equipment see your RCA Test Equipment distributor or writeRCA Electronic Components, Commercial Engineering, DepartmentNo. L -46-W13, Harrison. N.J. 07029.
LOOK TO RCA FOR INSTRUMENTS TO TEST/MEASURE/VIEW/MONITOR/GENERATE
DECEMBER 1968. for more trews circle 127 on postcard
31
This very tiny thin-film transistor is an important new semiconductor development.
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TECHNICAL DIGEST
SPLICE ANDBROWN
SOLDERWIRE
HERETO 5401
wire, C401 pigtail and F402 pigtail together as shown andsolder. Clip off any excess wire at joint and dress the spliceoutward to make sure that there is no possibility of splicetouching vertical output transformer.
SYLVANIATesting Field Effect Transistors
The ordinary transistor tester runs into a brick wallwhen called upon to test a field effect transistor. In view ofthis fact, we will point out some ways of checking this typetransistor and some of its characteristics.
First this type transistor is operated very much like avacuum tube in that; (1) It has a high input impedance,(2) it is voltage operated and (3) it is biased like a vacuumtube. This type transistor has a low noise level. There aretwo channel types, N -channel and P -channel. The formertype is made of N -type semiconductor material with P -typematerial (gates) deposited and P -channel uses P -typematerial deposited for use as gates.
Unlike ordinary transistors, the input (gate) material isreverse biased to allow near zero or leakage current only toflow. The amount of voltage on this gate determines the cur-rent from source to drain. An ohmmeter may be used tocheck the front -to -back ratio of this diode junction the sameway as in an ordinary diode or transistor junction. Caution:Some of these transistors for low signal levels are unable towithstand even ohmmeter currents and voltages. A suitableseries current limiting resistor should be used on thesetypes. Some of these transistors arrive from the vendor witha shorting ring to all terminals. This is to prevent staticcharges from breaking down the diode junctions, especiallyin IGFET's. When picking up or touching an IGFET device,the hand should be at ground potential. The leads can be
LIMITING RESISTOR
1.5VOLTS
. . . for more details circle 125 on postcard
32 ELECTRONIC TECHNICIAN/DEALER
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Fully automatic rotor moves quickly-andprecisely-to the point where it is aimed bythe control unit-never loses synchroniza-tion, never drifts
High torque drives through ice, snow, andhigh winds
Rotates 360° in less than 40 seconds-fastest rotor available
Kitten -quiet solid-state control unit. Noclacking. No whirring. No relays, switches,solenoids, or escapements
No lubrication required-operates reliablyat -20°F
Lightweight, easy -to -install rotor weighsonly 5 pounds
Consumes less than 1/10th the power ofother rotors
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Focusing on one thing ... better reception
a GENERAL INSTRUMENT company
'EMBER 1968. for more details circle 115 on postcard
33
HIDDEN* 1111
AT:"3. ALITY
MODEL 630 V -O -M
CAUTION ON 1.10314 VOLTS
S0002 0 0
---300--SO
-12
Standard
Of the
industry
$61.00
EASY TO CHANGEEXCLUSIVE TRIPLETT BAR RING STANDARD BATTERIESSHIELDED MOVEMENT
FUSED
SIMPLE TOREPLACEMULTIPLIERSOR SHUNTS
HEAVY MOLDED CASE
HIGH FLUXMAGNET,
SPRINGBACKEDJEWELS
-FORRUGGEDNESS
SPARE FUSE
COMPLETELY WIRED CIRCUIT
FACTS MAKE FEATURES:
1One selector switch minimizes chance of incorrectsettings and burnouts.
24.4 ohm center scale, reads from 0.1 ohm up to100 megohms resistance in 4 ranges.
3 20,000 ohms per volt DC sensitivity: 5,000 AC.
Attention to detail makes the Triplett Model 630 V -O -M a life-time investment. It has an outstanding ohm scale; four ranges-low readings .1 ohm, high 100 megs. Fuse affords extra pro-tection to the resistors in the ohmmeter circuit, especially theXI setting, should too high a voltage be applied. Accuracy 2%DC to 1200V. Heavy molded case.
f630A same as 630 plus 192% accuracy and mirror scale only $71.00
TRIPLETT ELECTRICAL INSTRUMENT COMPANY, BLUFFTON, OHIODON'T FORGET TO ASK 'EM. "WHAT ELSE NEEDS FIXING?"
. . . for more details circle 129 on postcard
NGEsrclipped together with a pling to prevent unsafe vole/;
As in all transistors, ylt' SpriPea crground potential. Of coul, ring o
energized when removing or ering betweenitie han t' eiem nd-A test for short or openeircait ents.
made by connecting the gate to ri de,.. showd be atI .5v through a milliameter from ice._ be de,of current should flow. Less tha, 17's/slotscondition and more than this indicati://nnid can be
The transconductance (Gm) of g=e; 2 °,..iinectfound by dividing the ac signal outs '4)/ilainput (gate) signal voltage, and the :tint, °Pen
IN
Ita j, be
tie
)F
GAIN-AC O.AC IN
measured by connecting an amplier and comparing signalout to signal in. Shown in typical fixed and self -biasingarrangement.
The illustration shows the connections to make gateleakage tests. The resistance in this circuit will be very largeallowing only nanoamperes or microamps current flow. Thisis true especially of the IGFET's. Junction type resistancesare very temperature -sensitive, similar to semiconductordiodes.
V(BR)DGO241k
Maximum voltages specified by the manufacturer indicate lowest voltages that may be applied between elementthat will lead to device breakdown.
Courtesy of Sylva
34 ELECTRONIC TECHNICIAN/DF
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... for more details circle 108 on postcard
DEC -EMBER 1968 35
New SK De cesSim Servi ng of TVDeflect! Cir uits
More than a dozen solid-state TV sets-RCA and others-can usethese two new RCA SK -Series transistors-specifically designed forreplacement use in deflection circuits.
The RCA SK3034 is for replacement use in horizontal driver and invertical -deflection -output circuits: the SK3035 is for replacementuse in horizontal -deflection -output circuits.
Both units are germanium p -n -p devices in hermetically -sealedTO -3 packages, and are for use in domestic and imported TV setswith anode voltages to 18 KV and with picture tubes having deflec-tion angles up to 114°.
Add both to your stock of RCA -Top-Of-The-Line" SK -Series re-placement transistors. See your RCA Distributor today about yoursupply of RCA SK -Series replacements . . . 33 individual units thatcan replace approximately 11,800 solid-state devices.
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Now available...a comprehensive and accuratesource of solid-state replacement information!Its RCA's Solid -State "Top -of -the -Line- Re-placement Guide, SPG-202F. Cross-referencingRCA SK -Series Transistors. Silicon Rectifiers,and Integrated Circuits, the Guide provides re-placements for nearly 12,000 solid-state devices
-!ncluding U S industry standard EIA types, for-eign types, and types identified only by device -manufacturers' or equipment manufacturers'parts numbers. SPG-202F is available throughyour RCA Distributor. Ask him about it. Today.
Ask your parttcrpabng RCA Distributor for details.
... for more details circle 126 on postcard
36 ELECTRONIC TECHNICIAN/DEALER
Approach to Circuit AnalysisTroubleshooting TV, radio or Hi Fi circuits iseasier if you know how they work. Application ofsome well-known theories can help you analyzethese circuits
How do you un-derstand themeaning of acomplicatedelectronic sche-
matic? You probably start by look-ing for simpler inside circuits. It'scommon practice to study largeschematics a section at a time togain a better understanding of theover-all picture.
But for debugging and serviceproblems the search must go in theother direction. Schematics usuallyprovide enough information for acompetent technician to build theunit, but test and operating infor-mation tends to be sparse. Normaldc and signal voltages, may beomitted although they are helpfulin finding malfunctions. Or theymay be plainly stated yet have ob-scure meaning. An interesting cir-cuit which is simple, popular anduseful but hard to analyze is theWheatstone Bridge.
One factor which noticeably com-plicates this problem is the addedcircuitry provided with the basicoperational components. The extracomponents are necessary and reg-ulate such things as bias, frequencyresponse, provision for real partstolerances and other practical mat-ters. Yet their use may not be clearand they increase the complexity ofpossible service problems. In someextreme cases you may think thatthe designer himself did not under-stand the basic facts of voltage,current, impedance and function, orit may seem he must have tried
very hard to hide them. But theyare all there in the schematic. Theproblem is to get them out.Basic Laws
If we know the value of a resistorand the voltage across it, Ohm'sLaw tells us how to find the valueof the current through it. By apply-ing Ohm's Law we can find outsomething about a circuit withoutmaking direct measurements. On amore advanced level, Thevenin'sand Norton's Theorems also pro-vide information about circuits.They are used to clear away com-plicated details so the true circuitfunctions are made clear. At first itmay be hard to believe the final"equivalent" circuit could illustratethe behavior of a complicatedcircuit.
The wording of these two circuitgeneralizations depends upon howmuch detail the writer is trying tocover. As given here, they apply todc circuits and to circuits whichmay be viewed as dc circuits. All
.ELECTRONICTECHNICIAN / DEALER
DECEMBER, 1968
bias circuits are dc and some filtersand ac circuits resemble dc circuitsso that even in their simplest formsthese ideas are very useful. And byimproving the definitions we canapply the basic theory to the un-even, erratic events in pulse andswitching circuits.
Thevenin's Theorem states that"any real circuit of linear genera-tors and resistances may be re-placed for purposes of calculationby a single equivalent voltage gen-erator in series with a single equiva-lent resistance." All Theveninequivalent circuits look like Fig. 1,which could represent a battery, alarge Hi Fi amplifier or many otherelectronic systems and situations.
Norton's Theorem states that"any real circuit of linear genera-tors and resistances may be re-placed for purposes of calculationby a single equivalent current gen-erator in parallel with a singleequivalent resistance." For in-stance, Fig. 2 could represent the
OPEN -CIRCUITVOLTAGE
VEO. VOLTS'`..
NORMAL I \N....------ol
OPERATING.RANGE
VOLTAGEt
CURRENT
Fig. 1 -A Thevenin equivalent circuit and its load line.
I SNORT- CIRCUIT CURRENT
VEO- AMPERESREO
DECEMBER 1968 37
.411111111MINIMMILL.
electrical behavior of a transistor orpentode output, a constant -currentcircuit, certain TV circuits andsome industrial electronics circuits.
Equivalent CircuitsThe real importance of these
theorems appears in the simplecircuits of Figs. I and 2, and in thelarge number of complicated realcircuits that we can reduce to oneof these two basic equivalents.Let's look more closely at the threekey terms. They are: linearity,generator and equivalent.
Linearity is the property ofsimplest possible predictability. Acircuit is linear if we can plot itsvoltage or current characteristicsas a straight line. Most small -signalhi fi and radio circuits are linear be-cause this is the only characteristicgiving an output signal which dupli-cates the input signal. Limiting andclipping circuits are nonlinear, andswitching components such asSCR's, thyristors and diodes aresharply nonlinear.
Electrical power comes from asource called a generator. In elec-tronics we use the term loosely toinclude any circuit or device atwhose two terminals we can findpower. A transistor generates nopower but if we ignore its dc supplybiasing, the transistor seems to gen-erate the signal power it has actuallyborrowed from its dc biasing. Avoltage regulator circuit with apower supply in back of it appearsto be a complete power source initself when we make tests at itsoutput terminals.
Equivalent indicates that per-formance calculations based on thepaper circuit will yield papermeasurements resembling the re-sults of comparable tests on thereal circuit. This important rela-tionship can be very confusing to abeginner. For instance, suppose wesay a power supply has a I S2 out-put resistance or maybe we findthis entry in a catalog. But there isno 1St resistor anywhere in itsschematic. Instead, the resistor is
Fig. 2 -A Norton equivalent circuit and its load line.
OPEN - CIRCUITVOLTAGE
N NORMAL
OPERATINGRANGE
CURRENT r SHORT- CIRCUIT CURRENT
1E0 AMPERES
in the circuit's Thevenin equivalentand is said to be responsible for thereal circuit's voltage drop underload.
The voltage, current and resist-ance values in our equivalent cir-cuit may all be different fromanything immediately visible in thereal circuit. In fact they probablyare. How do we find the correctequivalent circuit?
We work out a paper circuit thatwill generate the same voltage andcurrent values as the real circuit atany two load values. Because ourreal circuit is linear we can draw astraight line through these two re-sults and all other possible voltage -current combinations from deadshort to open circuit will lie on thissame line. This line is called a"load line."
One of our two points is likely tobe an open -circuit voltage measure-ment or a short-circuit currentmeasurement. In practice we usual-ly do not make both these extrememeasurements because a realcircuit that is happy facing either ofthese conditions usually sees theother as harmful and may be dam-aged by it. For example, if we wantto make a load line for a powersupply, we commonly use the open -circuit voltage as one of the testconditions, but we do not short thesupply to discover its maximumcurrent capability.
Instead, we apply a heavy loadknown to be within the capabilities
of the supply, and plotting the re-sults of these two tests we canestimate the actual short-circuitperformance of the circuit. Thismethod is in perfect accord withnormal application of the supply,which does not operate into theseextreme conditions anyway.
Another approach is the "thoughtexperiment." In this experiment weavoid tests altogether until the pic-ture is well worked out. And then ifa test appears necessary, we cancarry it out in an effective way. Us-ing this approach we imagine theoutput terminals are opened -cir-cuited. An inspection of the sche-matic will usually show that someof the components have no effectupon the output voltage which wecan now estimate. Then we imaginethe output terminals are shortedand we can estimate the maximumshort-circuit current. See Figs. I
and 2. This approach seems ab-stract but it works very well andclarifies many details of circuitoperation.
Once we have the key voltageand current values worked out, wecan draw the equivalent circuit.Our open -circuit voltage is theThevenin generator's voltage value,the short-circuit current is the Nor-ton generator's value, and either.resistance is calculated by Ohm'sLaw.
This identical -twin relation be-tween Thevenin's and Norton'sTheorems is very interesting to the
38 ELECTRONIC TECHNICIAN/DEALER
Fig. 4A- Initial sketch for the audio loading problem.
Fig. 4B -The same circuit redrawn to emphasize the relations betweenvoltage, resistance and unknown load.
Fig. 3 -The Thevenin equivalent of a small battery.
mathematically inclined. Called"duality" and perhaps confusing tobeginners, it is an apparent inter-changeability between the twotheories. Sometimes it is hard todecide which one to use, but thedifficulty disappears as you becomemore familiar with them.
One equivalent circuit em-phasizes current; the other is involtage terms. Taking another per-spective, the Thevenin equivalentwill be most useful if the load doesnot greatly affect the circuit's out-put voltage. Or the Norton equiva-lent will be more appropriate if theload does not have too much in-fluence upon the circuit's outputcurrent.
Electronic circuits do not showany favoritism in preferring voltageor current signals but many work-ers do. Such a preference is ahandicap. For instance, the spot ona TV screen moves in response toa changing magnetic field whoseintensity must follow a sawtoothwave. A current signal is applied tothe deflection yoke. The voltagesignal observed is really a by-product of the yoke's inductanceand resistance, which accounts forits unlikely appearance.
Using the TheoryA real understanding of The-
venin's theory won't come to youall at once and applications willseem rare at first. But with practice,new applications and meanings willappear.
The normal approach to Theven-in's theory involves a battery, per-haps because batteries are verysimple. Let's suppose a small bat-tery shows a no-load terminal volt-age of 3.0v, and this drops underload to 2.9v at 100ma current. Whatis its Thevenin equivalent circuit?
We simply draw a Theveninequivalent circuit and choose volt-age and resistance values for itwhich would account for the resultsof the actual test. See Fig. 3.
At zero current load there wouldbe zero voltage drop across theequivalent resistor. The generatorvoltage must be 3v. Now, if underload the terminal voltage drops butthe equivalent generator voltage re-mains the same, the drop must bedue to the current passing throughthe series resistor. A .1v drop at .1awould require a 112 resistance. Wewrite that value next to the resistor.
Now we can estimate the currentthat would flow under any load.For instance, our Thevenin equiva-lent would deliver a calculated 3ainto a short circuit. The real batterywould, too, if its chemicals couldkeep up with the high demand. Aclass B amplifier drawing 0.5a ofcurrent would cause a drop of 0.5vin the supply voltage, which mightrequire decoupling of the amplifier'sinput circuits.
Here is a problem which appearssimple but resembles some harderones. A 6v audio signal is to besampled by a pickup circuit. Thespecs give the source resistance as
500 n
5.94v
50052. What pickup circuit resist-ance will not reduce the signal volt-age by more than 1%?
This is illustrated in Fig. 4A as aThevenin equivalent with knowngenerator and terminal voltages,known 'generator resistance, butunknown load resistance. Ourproblem is to find the smallestworkable load resistance.
The picture becomes clearer ifwe redraw it, emphasizing the volt-age divider effect which causes thevoltage to drop under load. This isFig. 4B. Since the same currentflows through both known and un-known resistors, the voltages maybe expressed by a proportion whichgives the solution:
.06 = 6
500 RL + 500+ 500 = 50K;
RL = 49.5K MW.Our result is almost intuitive.
Yet with the help of the equivalent -circuit approach its accuracy isguaranteed, and we have a way towork out similar but harderproblems.
The Wheatstone Bridge circuitis simple and yet hard to anaylze.But we can find a pair of Theveninequivalents and assemble them intoa single equivalent which will ex-press the operation of the bridgeover a small part of its range. Lookat the bridge in Fig. 5A, for in-stance. Given the resistance shown,what will be the resistance in' R1 atbalance at 35°C? And what will be
DECEMBER 1968 39
.9 v dc
R2TENWAL w4243..1
220 AT 40C260 AT 35°C
R34200
R4560n
Fig 5A-A Wheatstone bridge circuit as wemight see it in an industrial schematic.
Fig. 5B-The Wheatstone bridge circuitafter redrawing to emphasize its insidevoltage dividers and the meter resistance.
33211
3.65, 3.65r
3
71 n
139
550
5 ma
5 ma
50.1.1a
=1K
Fig. 7A - Norton equivalent of microammeter circuit.
Fig. 7B - Norton equivalent, with meter details and shunt load added.
the meter's approximate temper-ature range?
Although the thermistor's resist-ance varies nonlinearly with temper-ature, we can use a Thevenin equiv-alent for any specific temperature.
In Fig. 5B the bridge is redrawnas a pair of voltage dividers with aresistor and meter between them.This takes away most of the bridgemystery, and it shows that thebridge is balanced when both volt-age dividers reduce the input volt-age in the same ratio.
If the bridge is balanced at 35°C,we use the ratio from the RH sideof the bridge to work out the un-known resistor in the LH side.That is,
820= X ; X = 38IS2560 260
Now we know all of the resistors inthe circuit.
The rest of the solution proceedsin this way. The voltage across themeter terminals is the open -circuitvoltage less drop due to currentflowing through the bridge equiva-lent resistance as seen by the meter.We will draw Thevenin equivalentsof the voltage dividers, one at atime, and then simply add up theresults.
The RH side, composed of fixedresistors, always has the sameequivalent. See Fig. 6A. Under no
Fig. 6A - Thevenin equivalent of RH voltage divider.Fig. 6B-Thevenin equivalent of LH voltage divider at 35°C.Fig. 6C- Thevenin equivalent of LH voltage divider at 40°C.Fig. 6D-Both Thevenin equivalents and meter resistance, at 40°C.Fig. 6E-Final Thevenin equivalent and meter load at 40°C.
05v
load, the terminal voltage will be3.65v. Without actually performingthe test we can see that if the termi-nal were shorted to ground, the cur-rent would be
9v = lima82052
and that 3.65v through 33252 woulddeliver the same short-circuited
Applying the same procedure tothe LH side we find the same volt-age but a different equivalent resist-ance because the real resistors areof different values than in the RHside. See Fig. 6B.
Now we want to estimate whathappens to the bridge when a tem-perature change unbalances it. Wefind that if the thermistor is warmedup to 40°C, its resistance drops to22012. The LH equivalent becomes3.3v through 13952, as in Fig. 6C.
In Fig. 6D everything is put backtogether, using the appropriate T.equivalents and including the meterresistance. At 40°C the total circuitresistance is 13952 from the LHequivalent, plus 1K meter resist-ance, plus 33252 from the RHequivalent. And the difference be-tween generator voltages is 1.135vwhich gives us the new T. equiva-lent of Fig. 6E. A five -degree tem-perature rise will produce a metercurrent of 238µa, or roughly 48µaper degree C.
Summing up, the bridge will bal-ance at 35°C with the adjustableresistor set at 261S2 for a total of381SZ in that leg of the bridge. Andthe meter needle will indicate about
40 ELECTRONIC TECHNICIAN/DEALER
3ma
Fig. 8-Norton equivalent for audio output stage design problem.
1°C each way from balance.Using Norton's Theory
Sometimes an otherwise carefulcurrent measurement test is spoiledby forgetting to consider possibleeffects of meter resistance. And itmay not be immediately clear, forsome applications, how much meterresistance is too much. Norton'stheory provides a good perspectivefor sizing up this question.
For instance, suppose we wantto use a 10002 50p,a meter to meas-ure 5ma in a 300v circuit. Whatshunt resistance should we choose?
The circuit voltage is not veryimportant since it will not enterdirectly into the test. We are al-ready working in current terms.The Norton equivalent is appropri-ate here and the short-circuitcurrent of 5ma is given. Since theopen -circuit voltage would go to300v, the parallel equivalent re-sistor is 60K. The Norton equiva-lent appears in Fig. 7A.
Adding the meter and its shuntwe get Fig. 7B, with some voltagesand currents being immediatelyapparent. At full-scale reading themeter is carrying 50µa, giving50mv across its terminals and4.95ma through its shunt resistor.The shunt must be 10.152.
Further detail emerges. The10.12 is insignificant compared tothe 60K parallel generator resist-ance. But if we used the same meterto read 50µa full scale, with noshunt, its 1K would introduce morethan 1% error.
Here is a more interesting prob-
150 2N2552
i-3v RIPPLE
T
10v OUTPUT
INPUT MT) OUTPUT36v I0v
GE Z4xL7.5
3500
TIIN2974
Fig. 9A- Input and output voltages for regulator problem.
Fig. 9B -The simple current -limited zener regulator circuit.
lem, which is not so clear-cut. Someheadphones requiring 10mv intoan 82 load are to be used with ajunk -box transformer and a smalloutput tube. A simple voltage testshows the turns ratio of the trans-former must be about 18:1. Choosea tube and estimate the grid signalrequired to deliver 10mw to theheadphones.
The impedance transformationgoing back through the transformeris the square of the turns ratio sothat the 82 load becomes 2.6Kseen by the output tube. Knowing10mw is required into this load, wecan estimate the output tube mustdeliver 2ma of signal current.
Other requirements appear. Toguarantee 2ma available in the realcircuit we should plan for a tubethat will deliver at least 3ma. Andto avoid possible excessive distor-tion, the tube anode resistanceshould be not smaller than perhapsfive times the load resistance. Theserequirements are summed up inFig. 8. Our new problem is to finda tube and circuit which will havethis Norton equivalent circuit.
A 6AQ5 would consume 30maof dc current and this seems ex-travagent in view of the small signalcurrent required. Perhaps an RFsharp -cutoff pentode...the 6AU6comes to mind, and suggests that
old standby, the 6AK5. It's notusually chosen for an output tubebut its anode current of 7 to 8ma isright in the ballpark.
The 6AK5's transconductanceof about 5ma per volt works out toan estimated grid signal of 0.7v todeliver the required power. Thisis safely within the roughly 1.4vbias apparently needed; so we goahead with the bias design andperhaps a breadboard of the circuit.Complex Applications
Not all circuits convenientlycarry current and voltage signals inwell separated parts of the sche-matic. And not all "signals" aresignals in the usual sense that theirvariation over time is the essentialpart of the circuit operation. Theoutput from a good power supply isa "signal" that carries no signal.
Here is an example of such acircuit. About 36v of dc carrying3v of hum, as in Fig. 9A, is to bereduced to 10v of good dc by thecircuit of Fig. 9B. How much humshould we expect to find at the out-put? What will be the output char-acteristics under load and overload?
In this arrangement, the tran-sistor acts as an emitter followerimposing the zener's 7.5v across a152 resistor. The resulting 500maenters the transistor emitter termi-nal, a small control current flows
DECEMBER 1968 41
3vHUM INPUT
750 n
3n
12 mv MAXHUM OUTPUT
Fig. 10 - Thevenin equivalent circuit forestimating maximum possible hum.
3n
Fig. 11A -Thevenin hum genera-tor.
Fig. 11B - Norton hum generator.
out the base terminal, and perhaps496ma appears at the collectorterminal.
We use a Norton equivalent cir-cuit here because the transistorwill try to deliver its 496ma for allcollector voltages from saturationto breakdown. The hum voltage islost, incidental noise is lost, and itappears that all regulation is lost,too. The voltage from collector to
10
OUTPUTVOLTAGE
O
- 8.5v
10v
4.96 maI
OUTPUTCURRENT
30
496 ma
Fig. 12A - Broken load line illustratingregulated supply performance at normaland overload conditions.
Fig. 12B -Thevenin equivalent circuitdescribing dc power supply perform-ance at normal load.
Fig. 12C-Norton equivalent circuit de-scribing dc power supply performanceat overload or short-circuit.
ground will depend only upon loadresistance, being 0.496v for 12load, 4.96v for 102 load, etc.
But a zener diode load for theconstant current circuit will re-trieve the voltage regulation with-out reintroducing the hum andnoise. The output seen across thezener is good dc. If the outputterminals are shorted, the zenergoes out of action, and the output
current is limited to normal oper-ating values. This is a handy simplesupply circuit for shop applications.
How much hum will remain inthe output? We can guess its maxi-mum level from the voltage dividercircuit of Fig. 10. The voltagedivider consists of the constant -current circuit's equivalent resist-ance in series with the zener'sdynamic resistance. This reducesthe 3v hum input to whatever humappears at the output terminals.
The constant -current transistor'soutput resistance will not be lessthan its amplification factor timesthe resistance in its emitter circuit.Transistors have very high amplifi-cation factors and a conservativeestimate for this case is mu equals50. So 3v of hum through 7502equivalent resistance gives about4ma of hum current at the collectorterminal.
Since the zener has a dynamicresistance at normal operating cur-rent of about 312, the 4ma of currentwill generate a hum level of 12mvwhich is seen across the outputterminals. The situation can besummed up with either a Norton
\ or a Thevenin equivalent, and bothappear in Fig. I 1.
Performance at dc is anotherquestion. Starting with zero loadcurrent we imagine we are makingvoltage measurements at the outputterminals, at successively greatercurrents. At zero load the zener isreceiving 496ma, and perhaps wefind exactly 10v output. (Remem-ber all real components have toler-ances.)
As the load increases, the zenerreceives less current and its voltagedrops in a way corresponding to a32 resistor in series with the output.At perhaps 480ma load, the zeneris not getting enough current tooperate effectively and the terminalvoltage is falling rapidly to zero. Alittle more current is available intoa good short.
In Fig. 12 the situation is summedcontinued on page 72
42 ELECTRONIC TECHNICIAN/DEALER
Let's ExamineSylvania's
`Gibraltar' ColorTV Chassis
A little circuit`knowledgeability'combined with the
`plugability' offered
in this chassis cansimplify servicing
Photo showing Sylvania's model CF521WR color TV with the Gibraltar chassis.
Integrated circuits,color TV picture tubes,power and special-pur-pose tubes and some ofthe newer semiconductor
devices are contributing to the rise in total electronic component sales during1968.
Every year we see more solid-state components being employed in newcolor TV sets which account for some of the rises in semiconductor sales.
Despite declines during the first three months of 1968, U.S. factory salesof color TV picture tubes inched ahead of their 1967 pace as reported byElectronic Industries Assn's. Marketing Service Dept.
We recently unpacked a model CF521WR Sylvania color set employing thenew "Gibraltar" chassis for Teklab evaluation.
This new chassis is a service technician's dream with the "plugability"concept carried throughout the entire chassis. The tuner cluster, deflectionyoke, convergence section, automatic degaussing section, speakers and remotecontrol unit have plugs for easy chassis removal.
The transistors employed have plug-in sockets eliminating time-consumingchassis removal to check and replace the transistors.
In addition this set has a number of features to simplify servicing, such asthe wing bolts used on the back cover and a removable bottom panel.
Two-thirds of the active components in the Gibraltar chassis are transistorsand it employs a new posted filament HV rectifier tube which is said to reducewarm up time. It virtually eliminates electrical shorts caused by shock, vibra-tion or high temperature.
There are a number of features on this chassis which should add to itsreliability:
The chassis has a line voltage switch which offers a choice of 120v or 125v.A newly developed Mylar-insulated, solid impregnant flyback transformer
is said to be impervious to moisture. The new solid silicon resin impregnantswill not melt or support combustion.
A new horizontal output tube is said to handle 30w of dissipation.The shunt regulator tube is mounted upright in a well -ventilated area with
a special "chimney cap" to keep the tube as cool as possible for extended life.About 66 percent of the circuit functions are transistorized and the lower
B+ operating voltage results in a 100w reduction of power thereby reducingtemperatures in the cabinet.
It also features improved color lock circuitry plus a more stable coloroscillator tube.
We will now cover some of the important circuits used in this chassis.
TEST LAB REPORT
DECEMBER 1968 43
S.GUM
T
Ton. r2111
21Z.L.7vIel0 OUTPUT
pcs.<taws.- L."4
tot3n.s. 1oC4)asoo
Fig. 1 -The brightness control and dc restoration circuit.
z.s.rrsvg awl+..14
COMPOSITE VIDEOFROM
T 600
AMPLIFIER
L614561.91
062022
ACCBras
+20v
8638120CL
14642azon
R640120
C624001
06101ST
CHROMAAMP
RE2;AJP22
+20V
R644iBK
06122ND
CHROMAAMP
0622 R65201 8200
8648
C626
C620
T602BANDPASS
R629COLORCONTROL
R607390(1
-I I 22PFIC630
C632150PF
TO
BURSTAMP
KILLERBIAS
C6060022
R609TINTCONTROL
C603T 330PF
C60947 PF
+20V
CHROMAC660
OUTPUT
R6348200
8628
8632330
06080056
T600
R630820
L60262008
FROM 0604BLANKER
CHROIAAOUTPUT8636560135%
Fig. 2 -The chroma IF amplifier circuit shown attenuates low frequency videoand passes frequencies in the chroma IF band.
Brightness Control and DC RestorationThe brightness control serves as a dc path for re-
taining dc restoration voltage from the video signalpath (Fig. 1). The control has one end connected tothe negative voltage developed at the horizontal out-put stage grid circuit. This allows a large negativerange of available bias voltage for the video outputstage. To decrease brightness, the control would berotated in the direction of the HOT grid connection.This provides larger grid bias for the video output, aplate voltage of higher value and therefore a positivevoltage on the CRT cathodes.
Dc restoration is accomplished in this chassis bydc coupling from the video detector to the cathode ofthe CRT. Part of this path is through the brightnesscontrol (R260).
Chroma IF AmplifiersComplete composite video signals from the 1st
video amplifier emitter are applied to the 1st chromaamplifier through C600 and L614 (Fig. 2). This net-work attenuates low frequency video and passesfrequencies in the chroma IF band. The 1st chromaIF will amplify these signals by an amount determinedby the ACC bias applied to the base of Q610 throughR638.
All signals are then coupled through C624 to thesecond chroma amplifier Q612. The collector load forthis stage consists of a resonant circuit C626 and thebandpass transformer primary T602. Sufficient band-pass is achieved by R648 in parallel with the resonantcircuit.
The bandpass transformer has an upper and
,20v
BAND PASSTRANSFORMER
T600
-
Fi?iCONTROL
C630 C63222 PF i50PF
C603
L600
2OVF1736 _L470PF
R654330fL
FROMR662O011
C6340604 - 0056 C642 SC604BLANKER 330 PF
TOACCAMP
T604
0614BURST
AMP
R660013
0638330PF
+20V
SC600C646
8666 R4)/_
1
766,..iMM3
14Hz58
<86613 R674
R676 Or22K
C640 SL602330PF
C644330 PF
SC 606
8672R680 C648
2 2PF
8706, 470K R682 G2
47011
TO REACTANCE CONTROL
Fig. 3 -The burst amplifier and phase detector circuits.
CHROMA tFINPUT
L60056U4R63656013
06080 DEMOD
R68856
0616"7"DEMOD
R689re
I 5K
R720150.11
C650186PF
I 0651
4-340V
R690561(2w
T 33 PF
R684 8686'son 33011
R72233013
L605
R72439011
+340V
C65933PF
R726561 L608
6201414
L604620148
147013914
R704396
3 58MHzOUTPUTT606
4-20V
TO G810 OF
C652
TO GRID OFa -r
066001
Fig. 4 - Schematic showing the X and Z demodulators.
44 ELECTRONIC TECHNICIAN /DEALER
R6202.7 K
C632156 PF
TO CHROMA OUTPUT
BURSTTRANSFORMER
0614BURST
AMP
Fig. 6-Schematic of the blanker circuit used in the D12 and D13chassis.
lower slug adjustment to be tuned to 3.1 and 4.1MHzrespectively and pass the full chroma IF band offrequencies. The transformer output is applied to tintcontrol R609 and color control R629. The tint con-trol provides selective inductive or capacitive loadingof the transformer output. This causes the entirechroma IF signal to shift in phase to provide full tintcontrol. The color control allows attenuation of thecolor signals applied to chroma output stage, Q606.
A performance advantage is gained in the tintcontrol circuitry. In earlier models the tint controlwas used to shift the received burst at the burst trans-former. This resulted in a change in burst amplitudebecause of a change in "Q" of the burst circuit. Thishad side effects of varying burst amplitude and chang-ing developed ACC voltage. Also the tint controlrequired additional shielded wiring to the receivercontrol panel. In this new circuit the tint control hasless effect on chroma amplitude even though it shiftsthe phase of the same chroma signal that is applied tothe color control.
The base of chroma output transistor Q606 re-ceives killer bias from the collector of color killertransistor Q602. The emitter circuit of Q606 receivesa blanking pulse through L602 from the emitter ofblanker transistor Q604 to eliminate 3.58MHz burstsignals. This allows only true chroma signals to bepassed through T600 to the "Z" and "X" demodula-tors plus providing suitable dc reference for thechroma signal.
Burst AmplifierChroma and burst information is applied to the
Fig. 5-A new switch at the back of the chassis offers a choice of120v or 125v operation by switching taps on the power trans-former primary.
C428001
FROMHORIZOSC.
TOBRIGHTNESSCONTROL
R4341.2 MEG
R438220.0.
R4361 MEG R416
5.6 MEG
TO HVRECT -1. TO41-4)
CRT.
HORIZOUTPUTTO FLYBACKTRANSFORMER
R4I21.2 MEG C436
120 PF
)ISC404H V LIMITER
FLYBACKPULSES
Fig. 7-Schematic of the HV protection circuits.
68K4
R4581K
SC410
+405V
burst amplifier, Q614. This stage is biased "off" undernormal conditions because of R656 which keeps thebase near emitter potential. During the burst intervala pulse from the blanker transistor Q604 biases theburst amplifier "on" and only the burst signal is al-lowed to pass (Fig. 3).
The burst amplifier therefore passes only colorsync bursts which are amplified and applied to bursttransformer T604. The output of T604 is applied tophase detector diodes SC606 and SC604 and killer de-tector diodes SC600 and SC602 ACC.
X and Z DemodulatorsIn order to demodulate the chroma sidebands, the
X and Z demodulators provide synchronous detectionof these signals with the 3.58MHz reference oscillatorinjection voltage. This voltage is several times thechroma input amplitude and provides large amplitude3.58MHz pulses in the collector circuits of thedemodulators. The phase of the 3.58MHz applied tothe Z demodulator is shifted approximately 90deg bycoil L605 and capacitor C650. The actual shift is
selected to provide accurate color presentation.When chroma signals are applied to the base of
the demodulators, the phase and amplitude of thechroma will influence the average amplitude of collec-tor pulses in each demodulator (Fig. 4). These pulsesgo in a less positive direction, nominally to about one-half the B+ voltage, 40v. If incoming chroma is inphase with reference pulses the collector pulses willdrop to less than '/2 B+ value. If they are out of phase,collector pulses will not be able to fall as low as V2 B+value. If chroma signals are 90deg out of phase, part of
DECEMBER 1968 45
Rear view of theGibraltar chassisshowing service
control locations.
Top view of chassisshowing the plugability
concept carriedthroughout theentire chassis.
the collector pulse will be below 1/2B+ value and partwill be above 1/2 B+ value. The result is an average ofzero change in collector pulses. The collector pulsesare averaged by a low pass filter before application tothe R -Y and B -Y amplifiers. These networks are 0651and L604 in the X demodulator, and 0659 and L608of the Y demodulator. After the collector pulsesmoothing is complete, only color video remains andit is applied to the difference amplifiers through 0652and ('660.
Power Supply Line Voltage SwitchA new switch at the back of the D12, D13, D08
and D06 color chassis offers a choice of 120v or 125v"normal" operation. This is done by switching tapson the power transformer primary (Fig. 5).
The useful operating range in the lower switchposition is 108v to 130v. In the higher position, the setwill perform properly from 113v to 137v. Since theranges overlap, most installations will be entirelysatisfactory in the 125v position. Keeping the switch
AFCADJUST
REMOTE CHASSISREMOVED BY PULLINGONE CLIP
BANDPASSTRANS.
BURSTTRANS
SCREENCONTROLS
HORIZFREQ
LINE VOLTAGE VERTICAL DRIVE HVSWITCH HEIGHT CONTROL ADJUST
PEAKING NORMAL/SWITCHSWITCH SWITCH
in this position provides the best over-all set life ex-pectancy and reliability. All sets shipped from thefactory will have the switch in this 125v position.
Blanker CircuitThe base of blanker stage Q604 receives a posi-
tive flyback pulse from a tapped winding on T400(Fig. 6). These pulses are inverted to establish nega-tive gating pulses in the collector circuit of Q604which provides blanking of the CRT during horizontalretrace and grid leak bias for the color differenceamplifiers. CRT bias control, R606, establishes themagnitude of these pulses and therefore the amount ofgrid leak bias developed at the difference amplifiergrids. Depending on the conductivity of the differenceamplifiers, their plate voltages will vary to control theaverage CRT grid bias.
Blanker state Q604 also serves as an emitterfollower to supply positive pulses to the base of burstamplifier, Q614. These pulses serve as a gating func-tion to allow only transmitted color sync bursts to
46 ELECTRONIC TECHNICIAN/DEALER
eir----11111111111111111.-, viENNIWEN1.
pass. The emitter of Q604 is also connected throughR622 and L602 to the emitter of the chroma outputstage to remove burst during retrace.
High Voltage Protection CircuitryThis circuit consists of interconnected bias net-
works that serve the following purposes in case ofhigh voltage regulator failure or circuit misadjustment:
1. Reduce horizontal output drive.2. Decrease CRT conduction by negative biasing
the final video amplifier.3. Provide over -voltage protection for flyback,
CRT and high voltage components.Under normal conditions, the shunt regulator
conducts through SC410 and the SC410 anode is verynear B+ voltage of 405v (Fig. 7). This voltage isdivided down by R416 and R412. However this volt-age tends to raise the HOT grid voltage and turn iton "hard."
If the high voltage regulator should stop conduct-ing, its cathode will become more negative and SC410will be reverse biased. Now the positive voltage fed tothe HOT grid through R416 is removed and the gridwill become much more negative. In addition to thegrid leak bias developed in this circuit, feedback pulsesfrom T400 are also coupled to the HOT grid circuit.These are rectified and filtered by SC404 diode andR412 to produce additional negative HOT bias. Uponremoval of the positive voltage from SC410 this biasexerts an even greater negative biasing of the HVtransformer. This decreases the output power deliv-ered by the HOT and will tend to keep the high voltageat a safe value.
It should also be noted that the HOT grid circuitvoltage is applied to the brightness control and biasingcircuit of the video output stage through R434 (Fig. 1
and 7). If regulation is lost, the increased negativevoltage at the HOT grid is also applied to the grid ofthe video output causing decreased conduction. Thiswould be reflected in more positive CRT cathodes andless CRT brightness.
The remote controlreceiver chassis withplug connectors areeasily removed byremoving one clip onthe mount.
Photo showingshowing the HV section of the chassis with a newly developedMylar-insulated, solid impregnant flyback transformer. It reportedlyresists moisture and will not melt or support combustion.
DECEMBER 1968 47
TEST LAB REPORT
TEST INSTRUMENTSChange your approach to solid-state equipment
servicing with specialized test instruments
Sencore Model PS148 Oscilloscope/Vectorscope
One of the most versatile combi-nation instruments for color andB/W servicing, including modula-tion checks and lissajous patternsfor communications or lab work isthe oscilloscope/vectorscope com-bination. Because of the increase incolor and transistorized sets, we de-cided to evaluate this modern testinstrument and its many uses.
The new oscilloscope/vectorscopecombination was connected to a latemodel Sylvania with excellent re-sults. The vector pattern viewed onthe screen was stable and clean, us-ing a standard 10 bar color gener-ator.
The vectorscope was easily con-nected to the set through two testleads attached to the output of theR -Y and B -Y chroma circuits. Itcan also be connected directly tothe red and blue grids of the colorCRT and one ground lead to thechassis. Then by flipping two switch-es at the back of the vectorscope,you are in business.
Various checks can be made withthe vectorscope, making it a very
useful instrument. Servicing colorsync, AFPC adjustments, bandpassamplifier checkout, touchup align-ment and 3.5MHz trap adjustmentsare only a few jobs this instrumentcan perform.
The oscilloscope is similar andhas all the features of the field prov-en PS127 oscilloscope.
The oscilloscope can be used in anumber of applications. This instru-ment combines the features of thevoltmeter, ammeter, frequency andphase meter, waveform analyzer andmany more.
There are a number of specialapplications for the scope, such as:synchroguide horizontal oscillatoradjustments, color servicing deter-mining frequency of an oscillator,TV and FM alignment and manymore.
This oscilloscope has a numberof features, some of which are notfound on other scopes.
The vertical amplifier input con-trols are calibrated directly in peakto peak values for faster direct read-ings.
The vertical amplifier is com-pletely wide band, 5 hertz to6.5MHz from the most sensitivesetting of .05v P -P per inch downto the less sensitive settings of thecontrols. No confusing band switch-ing or narrow bands to distort thewaveforms and result in erroneousanalysis.
Both direct and Lo -cap probesare available on the same cablesimply by moving the probe top tothe opposite end of the double pur-pose probe body.
The Lo -cap probe allows mea-surement of P -P voltages up to 7kvP -P directly. You can measure thecathode of the damper or the plateof the horizontal output stage.
Direct connection to the CRT de-flection plates (through blockingcapacitors) is made available on therear of the scope through bananajacks.
If you are thinking of a newscope, the additional $20.00 overthe price of the PS127 for the vec-torscope would be money well spentand a good investment.
48 ELECTRONIC TECHNICIAN/DEALER
Sencore Model P5148 Oscilloscope/Vectorscope
PS148 SPECIFICATIONS
Frequency Response (3db limits)Vertical Amp: 5Hz to 6.5 MHz. RISE TIME .055s.Horizontal Amp: 5Hz to over 400 kHz.
Deflection SensitivityVertical Amp: Direct Terminal .017 ÷ 5% voltsRMS/inch.Low Capacity Terminal .17 ÷ 5% volts RMS/inch.Horizontal Amp: At horizontal input jack .6 voltsRMS/in.
Input ImpedanceAt vertical input jack -2.7M shunted by 20pf. Throughvertical input cable -direct input jack, 2.7M shuntedby 107pf. Through vertical input cable -low capacityjack, 27M shunted by llpf. At horizontal input jack3.2M shunted by approximately 18pf. At sync inputjack 4.7M shunted by approximately 18pf.
Output ImpedanceVertical Amp: 2.7K each plate to ground.Horizontal Amp: 18K each plate to ground.
Deflection Sensitivity of CRT thru External DeflectionJacks
Vertical Plates (External -Direct Position) 8.1 + 10%Volts RMS/in.Horizontal Plates (External -Direct Position) 1510% Volts RMS/in.
Horizontal Sweep Generator (Phantastron Type Os-cillator Circuit)
Frequency Ranges continuously adjustable with ap-proximately 10% overlap on all ranges. Range 1:5Hz to 50Hz. Range 2: 50Hz to 500Hz. Range 3:500Hz to 5kHz. Range 4: 5kHz to 50kHz. Range 5:50kHz to 500kHz. TV Horizontal (7875Hz) and Vert.(30Hz) are marked on Horizontal Range Controlwith an "H" and a "V" for fast selection of theseranges.
Synchronization (Selectable and adjustable to over4MHz)
Internal. External. Line Frequency. Sync adjustablebetween plus and minus.
Maximum Input VoltagesThru Direct Input Jack or at Cable Input Jack-1kv P/P in presence of 1kv. Thru LO -CAP JACK 7kvP/P in presence of 1kv dc. Thru horizontal inputjack -30 P/P in presence of 400 vdc. Thru syncinput jack -30 P/P in presence of 600 vdc.
Physical CharacteristicsHeight: 11 in. Width: 9 in. Length: 151/2 in. Weight:22 lb.
DECEMBER 1968 49
One of Perry's oldest customers (for 22 years)brings a tape player in for service.
Perry TV enjoys the prestigeof its 25 -year service record.
BREADTH,
NOT DEPTH
Make an impact on yoursales, even if you are a
one -brand business, throughcareful buying, proper display
strategy and by makingevery customer a king
"There are several ways to makea small business successful," saysCharles F. Perry, owner of PerryTelevision in St. Louis, Mo. "Theseare careful buying, effective displaystrategy and especially, customergoodwill."
Selective InventoryLike many small TV -radio
service -dealers, Perry TV has alimited amount of space and man-power devoted to that vital partof the business called sales. A num-ber of dealers believe the only wayto sell is to jam the floors withstock so no matter what the cus-tomer wants, he is bound to find it.
Most small dealers can't affordthat type of inventory. One way toget around that problem is to usecareful "one -of -a -kind" buying. Inother words, breadth, not depth,states Perry. This way I can stretch
my inventory dollar and get thekind of sales floor impact the largestores have. I carry only one majorbrand of merchandise. If the cus-tomer is interested in that particu-lar brand, I can usually satisfy him.I normally have up to 15 differentcolor sets to choose from during falland winter, and 10 in the summer.
"But I have a trump card, too. Ihave a local supplier whose inven-tory is quite large. If I can't find afloor model that suits the customer'sneeds, I don't try selling him onefrom a brochure. Instead, I make anappointment to show him additionalmodels at my supplier's showroom.This clinches the sale."
The results of this program haveproven very profitable for PerryTV. Of the store's $95,000 income,more than half came from sales withthe balance split into parts andservice labor.
Tradition-Not SalesmenPerry's TV has no salesmen as
such, but it does a considerableamount of advertising. The YellowPages and two community news-papers make up the bulk of it. Thefirm also sponsors a men's and awomen's bowling team, and contrib-utes support to several serviceclubs, church functions and boys'clubs.
As in most successful sales pro-grams, Perry's TV operates with astrong backup of professional serv-ice. A 25 -year community image ofreliable electronic service is hardto beat, but Perry TV works everyday at improving its image. "It isn'tenough to just sell, we should, anddo maintain a well -staffed, well-equipped service area and ourprices are fair." Along with this tra-dition, Perry has invested more thanthe average shop his size in test
50 ELECTRONIC TECHNICIAN/DEALER
Charles Perry, (above) ownerof Perry TV, merchandisesone major brand and stocksas many as 15 different colorsets. He stocks inbreadth, not depth.
The built-in test instrumentrack above the main work-bench is orientated towardefficient service. Thetechnicians are provided withtest instruments of all typesin Perry's constantlyupgraded shop.
DECEMBER 1968 51
BREADTH, NOT DEPTH...
Perry TV has schematics on all TV and radiosets dating back to 1920. His schematics fill
dozens of shelves and filing cabinets.
instruments. He has added many ofthe bench area improvements him-self such as built-in test instruments,and has accumulated schematics onevery TV and radio since 1920.
Since a proper parts inventory isessential to a sales -service shop,Perry maintains a well -establishedstock "because we want to wrap upevery job at its location withouthaving to bring it into the shop."
Extras That CountPerry Television is operated as
any normal, well -run shop shouldbe. It's the extras that make it un-usual and noteworthy. Perry has nosalesman, but knows the importanceof courtesy and that a customerlikes to he recognized. Therefore, itis standard policy at Perry's tolearn a customer's name immediate-ly and use it often. Perry encour-ages his staff to do this. "By myexample," he states, "my men seethat I'm genuinely interested ineach customer and they naturallyfollow suit."
Customer Is King"We take extra care to treat each
customer like a king. When we gointo a home on a service call thefirst thing we do is ask for old news-papers to set tools and parts on sowe don't dirty the carpeting. Whenwe finish the job, we ask for a dustcloth to wipe our fingerprints offthe set. Of course, we could takethese things with us. The point is,that by asking the customer forthem she realizes we are takingpains to be respectful of her homeand furnishings.
"Another extra we do in the shopis to clean the glass on every TVin for repair. On some sets it cantake up to 20 minutes," Perry ex-plains. "We point out to the cus-tomer that we do it as a shopcourtesy. We also clean the dustfrom every set, inside and out. Wedo our best to be extra considerateof the customer and his business.We carry that into our service bycharging a fair price no matter whatthe set's make. We approach eachcustomer's job as if he were a kingand urgently needed the set to en-tertain a castle full of guests."
52ELECTRONIC TECHNICIAN/DEALER
Selling and Installing MATV Systems
Part six of this series is-a complete listing of
MATV equipment
manufacturers including
plain language specs
While some ordinary home -typeTV antennas can be used for MATVsystems, the following listingincludes only antennas specificallydesigned and ruggedized for MATV.Additional information on the anten-nas and components can be obtainedby writing directly to the followingmanufacturers: Blonder -Tongue Lab-oratories, 9 Ailing St., Newark, N.J.;Channel Master, Ellenville, N.Y.;Finco, 34 W. Interstate St., Bedford,Ohio; Jerrold Electronics, 4th andWalnut, Philadelphia, Pa.; JFD Elec-tronics, 15th Ave. at 62nd St., Brook-lyn, N.Y.; Winegard, 3000 KirkwoodSt., Burlington, Iowa.
JFD Smoothline SeriesCover all UHF and VHF channels.
Available in single channel andbroadband models. Low VHF bandmodels have five elements and pro-vide 8db gain. High VHF band and allUHF band models have 10 elementsand provide 10db gain. Three broad-band models cover the entire UHFspectrum (14-36; 37-60; 60-83).
Silver-plated 7512 output connec-tor on all models. Heavy-duty con-struction and corrosion resistantfinish.
JFD Rough Rider SeriesCover all UHF and VHF channels.
Available in both single channel andbroadband models, all log periodictypes. Channel 2-6 and FM singlechannel models have six elements,
Preamplifiers / Antenna Matching Transformers (Baluns)/ Mixers and Filters / Single Channel Head End Ampli-fiers / Broadband Amplifiers I UHF Broadband Amplifiers/ Broadband Amplifiers / 82 Channel / Cable PoweredAmplifiers and Accessories / Passive Splitters I Tapoffs/ Matching Transformers
provide 8db gain Channel 7-13 singlechannel models have 10 elements,provide 15db gain. Broadband VHFmodels cover entire VHF -FM spec-trum, providing 5 to 12db gain.Broadband UHF models cover theentire UHF spectrum, 14-83, provid-ing 12 to 14db gain.
All models have 7512 output, heavy-duty double boom construction andhigh front -to -back ratios.
Jerrold 1 -SeriesCover VHF channels only. Available
in single channel and broadbandmodels. Low VHF and FM band singlechannel models have five elements,provide 6 to 8db gain. High VHF bandsingle channel antennas have 10 ele-ments and provide 10.5db gain. JFF-LO covers channels 2 through 6 (8dbgain) and J55 -hi covers channels 7through 13 (8.5db gain). Broadband
units are log periodics, while singlechannel models are Yagis.
All models are heavy duty with 7512output. Low UHF band models havesand -loaded elements for vibrationdamping.
- - -
Finco Single Channel YagisCover VHF channels only. Low band
and FM Yagis are available with fiveelements (7.3 to 8.8db gain). Highband Yagis available with either fiveelements and (8 to 9db gain) or tenelements (9.9 to 11db gain).
All antennas feature 7512 outputand conductive coating process ofcorrosion protection.
PreamplifiersBlonder -Tongue Model CB
Single channel units for VHF bandonly. Tubed. 15db to 17db gain. In-put, 30012; output, two 7512 connec-tors; Noise Figure: channels 2 to6-3.5db; channels 7 to 13-7db. Built-in power supply.
Blonder -Tongue Model CMA-USolid-state. Two models cover all
UHF channels (14-59 and 58-83).Gain 13 to 14db. Noise Figure 9 to11db; 30012 input and 7411 output.Used with separate power supply.
DECEMBER 1968 53
Blonder -Tongue Model CMASolid-state. Single channel, cover-
ing VHF and FM bands only. Gain:channels 2 to 6-22db; channels 7to 13-25db; 3002 input and 752output. Noise Figure: channels 2 to6-4db; channels 7 to 13-5.5db. Usedwith Model 1514 remote powersupply.
Blonder -Tongue Vamp -2-75Broadband, VHF only. Solid-state;
3002 input and 752 output. Com-plete with remote power supply; 13to 15.5db gain; 3.5db to 4.5db NoiseFigure.
Channel Master Model 7264Solid-state UHF and VHF broad-
band. Gain: 13db-VHF; 16db-UHF.Noise figure: 3.5db low VHF band;5db high VHF band; 8db UHF; 3002input, 752 output. Complete withremote power supply.
Channel Master Model 7060Solid-state. Broadband. Covers
VHF and FM only; 10db gain; 5dbNoise Figure; 3002 input and 752output. Uses nuvistors. Completewith remote power supply.
Jerrold Model CPM-107-LSolid-state. VHF broadband. Gain:
channels 2 to 6-18.5db; channels 7to 13-12db. Noise Figure, 3.9db to5.1db; 752 input, 300 and 752 out-puts. Complete with remote powersupply.
Channel Master Model 0041Solid-state. VHF only. Broadband,
gain: 2 to 6-15db; 7 to 13-10db;3.7db noise figure; 3002 input; 300and 752 outputs.
Finco Models M13 to M18Single channel. Solid-state. Gain,
20 to 30db. Noise Figure, 3.5db to4.5db. Available in choice of 3002and 752 inputs and outputs.
FINC0
am
Finco Models M10, M11 and M12All three models are solid-state,
covering VHF and FM only. M10 is3002 input and output, Mll is 3002input and 752 output, and M12 is752 input and 752 output. Gain is20db. Noise Figure is 5.5db to 6.5db.All units are complete with remotepower supply.
Jerrold Model LPM-102Solid-state. VHF broadband. Gain:
11.5db. Noise Figure, 5.5 to 7.5db;3002 input, 3002 output. Completewith remote power supply.
Jerrold Model 4283Solid-state. Broadband UHF and
VHF. Gain: 13db VHF, 10db UHF;3002 input and dual 3002 outputs.Complete with remote power supply.
Jerrold Model ACP-105-LSolid-state. VHF and UHF broad-
band; 10.5db gain; 7db to 13.5dbNoise Figure; 300 input and 752 out-put. Complete with remote powersupply.
JFD Model SP -2700Solid-state. VHF broadband, 15db
gain; 4db to 8db Noise Figure. Passesall UHF channels. Complete with re-mote power supply; 3002 input, 752output.
JFD Model SP -2300Solid-state. VHF broadband; 3002
input and dual 30012 outputs; 14dbgain; 4 to 8db Noise Figure. Completewith remote power supply.
JFD Model SP -2701Same as SP -2700 except input is
752.
JFD Model SP -2730Solid-state. VHF broadband, 28db
gain. Noise Figure, 4 to 8db. Ampli-fies UHF channels slightly; 3002 in-put and 752 output. Complete withremote power supply.
JFD Model SP -2314Solid-state. UHF broadband; 3002
input and output; 14db gain; 1 ldbaverage Noise Figure. Passes allVHF channels. Complete with remotepower supply.
JFD Model SP -2782Solid-state. UHF/VHF broadband;
3002 input and 752 output. Gain:UHF-14db; VHF-12db. Noise Figure
54 ELECTRONIC TECHNICIAN/DEALER
4 to 1 ldb. Complete with remote channel number. Similar in construc- but can be field tuned to any non -power supply. tion to M230. adjacent high VHF band channels.
Winegard ACH SeriesEight solid-state preamplifiers.
Complete with remote power sup-plies.
Models AC895 (752) AC -823(30012) cover all VHF, UHF and FMchannels. Models AC -495 (752) andAC -423 (3002) amplify UHF and passVHF. Models AC -295 (752) and AC -223 (30012) amplify VHF and passUHF. Models AC -695 (752) and AC -623 (3002) amplify FM.
Antenna MatchingTransformers (Baluns)
000EL
M T-28 3
's
Blonder -Tongue Model MT -283Passes VHF, FM and UHF. In-
sertion loss-0.8db to 1db; 30012 in-put and 7512 output. Mast or surfacemounted.
Finco Model M231Single channel. VHF only. Specify
JFD Model 8320Matches UHF, VHF and FM; 0.7db
to 1.2db insertion loss; 30012 inputand 752 output. Mast mounted.
Jerrold Model To -374AVHF, FM only; 1.2db insertion loss;
30012 input, 752 output. Mastmounted.
MATCHING trko.:,
TRANSFORMER'
Jerrold Model MUV-374Matches UHF, VHF and FM. Inser-
tion loss, 0.75 to 1.5db; 3002 inputand 752 output. Passes ac. Mastmounted.
FINCO
M208 fk
Finco M230Matches VHF/FM band only; 30012
input, 752 output. Passes ac. Boomor mast mounted.
Winegard Model T -283MMatches UHF, VHF and FM; 3002
input and 7512 output. Specificationsnot available. Boom or mast mounted.
Winegard Model ST -75Similar to Model T -283M but
matches VHF only.
Mixers andFilters
Finco Models 244 and 245High and low VHF band networks
respectively. Model M-244 is factoryaligned to 2, 4 and 6 but can be fieldtuned to any nonadjacent low VHFband channels. Model 245 is factoryaligned to channels 7, 9, 11 and 13
Blonder -Tongue MX SeriesSingle channel filters which mount
into mixing bases (MX -LB for low VHFband and MX-HB for high VHF band).Each mixing base accepts up to fournonadjacent MX filters. Mixing lossis 1.2db. Skirt selectivity is -3db to-6db, 6 MHz from edge of passband.
Channel Master Model 7006Mixes or splits 4 nonadjacent VHF
high band channels. Specificationsnot available.
FILONM MINI MIMI10 i* 4.7
1:1 10 /10 raIIIIR0 0
Finco Model M-243Combines up to 7 VHF channels.
Incorporates two -stage bandpass fil-ter for each channel. Factory alignedfor channels 2, 4, 6, 7, 9, 11 and 13,but tunable in the field. Maximuminsertion loss 2db for each channelused. Each channel input used (7channels available) is bandpass se-lective to pass only that particularchannel.
Jerrold Models AMN-LO and AMN-HIAMN-LO combines 3 low VHF band
channels. Factory tuned to channels
DECEMBER 1968 55
2, 4 and 6 but field tunable to anynonadjacent low VHF band channels.AMN-Hl combines 4 high VHF bandchannels. Factory tuned to 7, 9, 11and 13 but can be field tunable toany four nonadjacent high VHF bandchannels. Mixing loss is 2 to 2.5db.Skirt selectivity is -12db, 6db fromskirt edge.
rt.', 41.4i :i '
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Channel Master Model 7005Mixes or splits 3 nonadjacent VHF
low band channels. Specificationsnot available.
Jerrold Model UMN-3UHF mixing network. Combines
any three UHF channels. Can be fac-tory tuned to specific channels. Mix-ing loss 1db. Skirt selectivity -19db,6db from skirt edge. UHF channelsmixed must be at least three chan-nels apart.
JFD Model 8202 to 8283Single channel filters covering en-
tire TV band, UHF and VHD. Rejec-tion outside passband (9MHz fromcenter frequency) is at least 33db.Insertion loss is less from 2db. Fac-tory tuned and extremely stable. Upto 8 nonadjacent single channel fil-ters can be mixed into single outputon mixing base. Signals can be equal-ized with built-in continuously ad-justable 10db attenuators.
JFD Model 8285Combines up to three nonadjacent
low band (2-6 and FM) channels.Factory pretuned to channels 2, 4and 6 but can be field tuned to anythree nonadjacent low band chan-nels. Rejection (9db from center fre-
quency): 15db insertion loss: lessthan 1.5db.
JFD Model 8286Combines up to four high band (7
to 13) channels. Factory pretuned tochannels 7, 9, 11 and 13, but can befield tuned to any four nonadjacenthigh band channels. Rejection (9dbfrom center frequency): 15db inser-tion loss: less than 1.5db.
Winegard Model ME26Handles up to four low VHF band
and FM channels. Includes plug-inattenuator pads in 8 values, 0 to20db. Factory aligned to any non-adjacent low VHF band channels, butcan be tuned in the field.
Winegard Model ME713Similar to Model ME26 but handles
up to four high VHF band channels.
Single Channel HeadEnd Amplifiers
Blonder -Tongue Model HSVHF. Self -powered; 30db gain; 4v
(72dbmv) output capability; 752 in-put. and dual 7512 output; 20db gaincontrol range. Tubed.
Blonder -Tongue Power DriveVHF. Self -powered, with AGC; 58db
gain; 6 (75.5dbmv) output; 40db AGCrange; 7512 input and two 752 mixingoutputs. Tubed.
Blonder -Tongue Model MCAIncludes input and output filters.
Solid-state; 51db gain; 2v (66dbmv)output; 40db AGC range. Self -pow-ered; 752 input and dual 7512 mix-ing outputs.
Jerrold Models M -AM and M -AAUsed with Model M -FS input filter,
M-FCA output filter and M-ENC en-
closures. VHF only. Self -powered.M -AM is manual, provides 33db gain.M -AA is AGC'd, provides 49db gain;63dbmv output; 752 input and dual752 mixing outputs. Solid-state.
Finney Model M170VHF. Self -powered. Solid-state;
40db gain; lv (60dbmv) output; 752input dual 752 mixing outputs; 3 to20db plugging pads to control gain.
Jerrold Model PMAVHF. Remote -powered; 28 to 33db
gain; 1.5v output; 3 to 21db plug inattenuators provide gain control;752 input and output. Tubed.
JFD Models SL3002 through SL -3083UHF, FM and VHF. Solid-state;
32db gain; 4v (72dbmv) output; 15dbgain control range; 752 input anddual 7512 mixing output. Modular PCboard construction. Self -powered andcan also line power preamplifiers.
Jerrold Model HPMVHF. Tubed; 42 to 46db gain; 4v
(72dbmv) output. Self -powered; 752input and two 752 mixing outputs;20db AGC range.
Winegard Model DS2 through DS83UHF and VHF. Solid-state. Re-
quires separate power supply; 30db
56 ELECTRONIC TECHNICIAN/DEALER
gain; 56dbmv output. Plug-in attenu-ator pads provide up to 20db gaincontrol; 7552 input and output.
BroadbandAmplifiers
Blonder -Tongue Model MLA -FMGain: 33db low band, 40db high
band. Tubed; 15 to 18db gain controlrange; 48dbmv output (7 channeloperation).
Blonder -Tongue Model CVB-45P43db gain; 54dbmv output per
channel (7 channel operation); 18dbgain control range. Solid-state. Pro-vides AC power for preamp.
Channel Master Model 703030db gain; 47dbmv per channel
output (7 channel operation); 20dbgain control range. Tubed.
Blonder -Tongue Model 1217Gain: 17db high band, 19db low
band. Tubed; 63dbmv per channeloutput (7 channel operation). Tubelife extender circuit reduces gain3.5db and output capability to 61.5dbmv.
,0
IIovIN1
M 108
FINCO.
Finco Model M10842db gain; 50dbmv output per
channel (7 channel operation). Solid-state.
Channel Master Model 705050db gain; 48dbmv output per
channel (7 channel operation); 20dbgain control range. Tubed.
Finco Model M11050db gain; 60dbmv output per
channel (9 channel operation).Tubed.
Finco Model M10636db gain; 48dbmv output (7 chan-
nel operation). Solid-state.
Jerrold Model 344022db gain; 42dbmv output per
channel (7 channel operation). Solid-state.
Jerrold Model 2880Tubed; 44db gain; 60dbmv output
per channel (7 channel operation).
Jerrold Model 3550Solid-state; 33db gain; 45dbmv
output per channel (7 channel oper-ation); 8 to 10db gain control range.
JFD Model V-3130Solid-state; 30db gain; 54dbmv
output per channel (7 channel opera-tion); 15db gain control range. Modu-lar PC board construction capable of
cable powering accessories. Three -wire line cord.
Winegard Model DS -LOLow VHF band only; 22db gain;
56dbmv output. Tubed. Requires sep-arate power supply.
Winegard Model DS -H1Similar DS -LO but handles high
VHF bands.
UHF BroadbandAmplifiers
Blonder -Tongue Model CUB -29PSolid-state; 29db gain; 49dbmv
output. Three -wire line cord.
7:1ZIEERD
RiLLTARSERIES
MOOR 5330
Alpo EittiPAn a.047,pi
Jerrold Model 5330Solid-state. 22db gain; 50dbmv
output capability.
JFD Model U-3140Solid-state; 32db gain; 56dbmv
output capability; 15db gain controlrange. Can line power remote acces-sories. Modular PC board construc-tion. Three -wire line cord.
Winegard Model DS -UHFSolid-state; 30db gain; 52dbmv
output. Requires separate powersupply.
Part seven of this series will con-tinue with the round -up of MATVequipment manufacturers andequipment. Ol
DECEMBER 1968 57
DEALER SHOWCASEFor additional information on products described in this section, circle thenumbers on Reader Service Card. Requests will be handled promptly
Stereo System 700A new compact stereo model is de-
signed to offer component qualitysound and features. The model 2513combines Scott's AM/FM/FM stereoreceiver with the famous Dual 1009Fautomatic turntable. The system comescomplete with two new S-15 three-way
air -suspension speakers. It offers avariety of advanced electronic features,including: Field Effect Transistor FMstereo tuner front end; Field EffectTransistor tone control; Integrated Cir-
and preamplifier; directcoupled all -silicon output circuitry;microphone/guitar inputs; provisionsfor plugging in tape recorder or tapecartridge machine, stereo headphones,or extra speakers; complete componentcontrol complement including DualBass, Treble and Loudness controls,speaker balancing controls, and tapemonitor controls. The Dual 1009Fturntable employs cueing control,stylus pressure and anti -tracking ad-justments, and a special fine adjust-ment for record speed. A Pickeringcartridge and diamond stylus are stand-ard equipment on the unit. The unitsare complete three-way systems eachwith a separate woofer, tweeter andmidrange. Scott.
Cassette Receiver 701Introduced is the new 3600 Cas-
seiver, a single component combininga 65w FM stereo receiver and a profes-sional stereo cassette recorder. Withthe Casseiver, the audio enthusiast canlisten to FM, FM stereo, or pre-recorded cassettes. He can also record
on cassettes from recorder, or directlyfrom the receiver's FM stereo tuner.The receiver section features Scott'ssilver-plated field effect transistorfront end circuitry. FET circuitry isalso used in the tone control circuitry.Integrated circuits are utilized both inthe IF strip, and in the preamplifiersection. Glass epoxy printed circuitboards and solderless connectors areused in the chassis. The cassette mech-anism is powered by a precision syn-chronous ac motor which is said tocut out annoying flutter and wow.
Control features of the cassette re-ceiver are as follows: ( Receiver sec-tion) TUNING control; POWER ON/OFF;SWITCHING for MAIN, REMOTE, orboth sets of speakers; Noise Filter;MONO/STEREO switch; TAPE MONI-TOR control; VOLUME COMPENSATIONcontrol; DUAL BASS and TREBLEcontrols; BALANCE control; Loup -NESS control; Input selector; CenterTuning meter; and stereo headphoneoutput. (Recorder section) LEFT andRIGHT LEVEL controls; Dual micro-phone inputs; Left and Record andReplay level meters; Resettable digitalcounter; and individual controls foropening the cassette section, RECORD,PLAY, FAST, FORWARD, REWIND andSTOP.
The tuner section of the receiver issaid achieves 2.5i2v sensitivity, with80db cross modulation rejection. Thestereo multiplex section utilizes solid-state time -switching multiplex circuitry.Separation is 30db and capture ratiois 2.5db. Price $399.95. Scott.
Service Caddies 702Announced is a new service caddy for
carrying replacement circuit modulesfor its all solid-state "Quasar" colortelevision receivers. The firm also hasmade available through distributors acaddy for replacement transistors forhome service of all solid-state B/Wreceivers. Designed to simplify thetransport and servicing procedures onthe firm's modular -design "Quasar"sets, the replacement module caddyincludes a complete set of 10 replace-ment procedures. Ample room also isprovided for carrying of service litera-ture and a voltmeter plus other spareparts. Measuring 191/4in. by 91/2in. by1 41/2in., the caddy is said to be sturdilybuilt. It has a body of plywood which iscovered by scuff -resistant vinyl and allhardware is made of steel. It features
a lift -out tray for additional storageroom at the top of the case. The re-placement transistor caddy for B/Wall solid-state television consists of a
transparent plastic carrying case mea-suring 71/2in. by 51/sin. by 11/4in. thick,plus a complement of 23 transistors forservicing. the firm's transistorizedchassis. The caddy can be slippedeasily into most service cases.Motorola.
Portable Color TV 703A new color portable with 10 plug-in
circuits boards is announced. Thesecircuits hold over 90 percent of allelectronic components. Individual unitshold complete discrete circuits and aresaid to be designed for service andreliability, rather than for space or pro-duction economy reasons. Nine of theten boards are mounted on new quickconnectors. The tenth board mountson the picture tube and also has plug-interminals. All electrical connectionsto units are made without any solder-ing through jack strips and plug connec-tors. The portable design incorporatesmany developments in reliability engi-
58 ELECTRONIC TECHNICIAN/DEALER
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IPT
ION
This little part playsa big role in radio.
Delco
cm DS -501This box gives you top revues. Transistor
The transistor is no bit playerwhen it comes to radio
performance. That's why Delcotransistors are manufactured
under controlled conditions thatassure high reliability. And
why they're thoroughly testedbefore being placed in the
familiar blue and black box.
Delco Radio engineers areleaders in auto radio design
and transistor technology.
Delco radios are originalequipment on over half
of the cars on the road.
That United Delco box is yourguarantee of genuine OEM
quality replacement parts. Andjust 12 Delco transistors replaceover 7,500 other types.
Doesn't it make good sense tostock the best?
Remember these facts when youre -order. And remember, too,that your United Delco supplierhandles the most recognizedname in the parts business.
Next time you think little,think big. Think Delco.
DELCO RADIO, Div. of General Motors, Kokomo, Ina,
GM r ,..Unitco AODelco
DECEMBER 1968
MARK OF EXCELLENCE
. . . for more details circle 109 on postcard
59
New! IRCSTRIPTROLA real time and money saver. Striptrolis a fast, convenient way to do shopreplacement of side -by -side strip con-trols in leading color and black andwhite sets. Big selection of I RC/CTSadjustors, elements, and housings. Noneed to wait for original parts. Partsare easy to assemble. Low cost, too.
2 LOW-COST STOCKSYour IRC Distributor offers two ver-satile stocks. Both include a sturdy,12 -drawer steel cabinet, dividers, la-bels, Striptrol assembly instruction,and replacement data.
STRIPTROLNow at leading IRC Distributors
DIVISION OF TRW INC.401 N. Broad St., Phila., Pa. 19108
. . . for more details circle 114 on postcard
DEALER SHOWCASE
neering in addition to new etchedcircuit units and the quick connectors.Solid-state devices have been usedwherever they improve picture per-formance as well as reliability. The
manufacturer has a factory exchangeplan for units whereby they will beeither repaired or salvaged in thefactory. Other features of the unit area clock, automatic turnoff, pillowspeaker, walnut cabinet, 5in. UHF andVHF antenna, an internal -externalantenna switch and four stages of IFamplification. Weight 44 lb. Marquette.
Antenna Display 704Announced is a free multicolor
counter display for dealers and dis-tributors displaying the Gavin Monitor100UV indoor TV antenna. The dis-play is printed in three colors and ismade of sturdy Masonite with a doubleeasel back. The Gavin Monitor 1000Vis one of the newest indoor TV anten-nas in the line and provides excellentreception for both color and B/W setsfor UHF and VHF stations plus FMradio. It has a slim design and folddown feature, permitting it to beplaced out of sight behind the set when
componentsof
all speakersbasketpotconevoice coilmagnet
extracomponents
ofQuam
speakers
customer -orientedengineering
top graderaw materials
scrupulousmanufacturing
precisionassembly
conservativeratings
QUA gives you a pre-mium in quality, asks no premiumin price. That's how we've stayedout in front for almost half -a -century!
QUAM-NICHOLS COMPANY234 East Marquette Road, Chicago, Illinois 60637
60
. . for more details circle 123 on postcardELECTRONIC TECHNICIAN/DEALER
not in use. The antenna mounts in-stantly to any TV set with an adhesivebracket said to eliminate the need forscrews or bolts. Gavin.
Microphone Display 705Announced is the availability of a
point -of -sale microphone display showcase. The "VECOR" display showcase Model MD -10 is designed to dis-play "VECOR" microphones. Eachmicrophone is identified with its model
number in gold and black lettering.Finished in a walnut exterior and a wal-nut wood picture type frame, the dis-play showcase measures 18in. x 24in.x 8in. inside. A plate glass in frontallows the microphones to be seen andprevents dust collecting. Latches holdthe plate glass in place to preventpilferage. A literature rack on theside holds about 100 microphone fold-ers describing the microphones. Thedisplay showcase is designed to beplaced on the counter or hung on thewall with hooks attached to the display.Vidaire.
Tuner Cleaner 706Introduced as a cleaner labeled Tun -
0 -Wash for (washing) all types ofT.V. tuners. It is claimed to removeall the "gook and gunk" formed bydeposits of grease, oil, etc. With theproper propelling force is said to dis-solve and wash away grime in minutes.It is claimed that the cleaner removesdirt and film so well that once me-
CHEMTRONICS
chanical and electronic repairs aremade, a protective lubrication is allthat is needed. Chemtronics.
Stereo Console 707The Alvaro Model G543 stereo con-
sole has Mediterranean styling and abuilt-in transistorized four -track, two -channel stereo tape deck. Features ofthe tape unit include three -speed opera-tion, separate record play and eraseheads, two dynamic microphones,automatic monitoring and an add -soundfeature. This model also comesequipped with the new Acoustaphonicspeaker chambers, two 10in. woofers,
two 3in. tweeters, two 2000Hz ex-ponential horns, and a solid-stateAM/FM/FM-stereo tuner. The Alvarois equipped for Porta-Fi and also hasdiamond stylus and 60w of peak musicpower. General Electric.
the Color Kina '
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Exclusive Built-in Heating ElementAssures Cold Weather STABILITY
" o---- 0 0
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Rock -solid stability - even if it's 20 below zero outside! That'swhat you get with Sencore's Color King color bar generator.
Only the Color King has a built-in warmer -upper -a thermo-statically controlled heating element surrounding the timer circuitryto give you quick warm-up for the most reliably stable patterns inany color generator.
All five standard color pattern - PLUS a single dot and singlecross to speed up dynamic convergence. Snap tuning for channels2 through 6. Interlace control to stop dot bounce. Increased chromaand sync signals. Color gun interruptors with switches on the panel.All solid state, AC operated.
So forget cold weather instabilityproblems. When you've got a SencoreColor King, you've got it made!
$149 95CG141 COLOR KING
NO. MANUFACTURER OF ELECTRONIC MAINTENANCE EQUIPMENT
426 SOUTH WESTGATE DRIVE, ADDISON, ILLINOIS 60101. . . for more details circle 128 on postcard
61DECEMBER 1968
COLORFAX
GENERAL ELECTRICColor TV Chassis KC-High Line Voltage
Tap on Power Transformer
All KC chassis power transformersare provided with a primary high volt-age tap which is identified on the sche-matic diagram as "WH/BLK 128VOLT TAP."
It has been determined, through
recent tests, that for maximum reli-ability and minimum service, the highline voltage tap should be used when-ever either of the following conditionsexist.
1. Average line voltage equals orexceeds 123v.
2. Line voltage equals or exceeds128v for a period of 15 minutes ormore during normal viewing hours
RCA VICTOR
Color TV Chassis CTC38 - DifferenceAmplifiers Circuit Description
In the CTC38 chassis, pentodes areused as the R -Y and B -Y amplifiers toamplify the low level color signals fromthe balanced diodes. The R -Y amplifier(V705) uses a 6CB6A tube. The B -Ydemodulator (V704B) uses the pentodesection of the 6GH8A tube. This ispossible because the 6CB6 and the pen-tode section of the 6GH8 have similarelectrical characteristics. Notice in thesimplified schematic (Color DifferenceAmplifiers) that the grid leak resistorfrom each of the difference amplifierstages is connected to the color killercircuit rather than ground. In this chas-sis the balanced diode demodulatorsare not killed as were the tube -typedemodulators in the CTC31. Therefore,the R -Y and B -Y amplifier stages arecolor -killed in this chassis. The G -Yamplifier is very similar to that of theCTC31 because the input signal forthis stage is obtained by combining aportion of the R -Y and B -Y signals ina matrix network. The 3.58MHz trapin the grid circuit of the G -Y amplifier
eliminates any 3.58MHz energy thatmight be amplified by this stage.
The ac coupling is used to drive theCRT grids as it was in 1968 two IFcolor chassis (shown in simplified sche-matic). Here again, the familiar diodeclamp circuit is used to establish andmaintain the dc operating point of theCRT tube grids. These clamp diodesare switched on during retrace by anegative going pulse at the plate of theblanker stage, and the low impedancepresented by the forward -biased diodeseffectively clamps the grids at a fixedpotential that is established by the set-ting of the kine bias control. Noticealso that 1K resistors appear in serieswith each grid lead to protect the diodesagainst any possible CRT arcing. Alsoadded protection is provided by the3.3K resistor in series with each diode.
An additional small pulse from theplate of the blanker stage is applied tothe cathode of the B -Y amplifier. Thispulse is used to adjust the operatingpoint of the CRT blue grid so that thecorrect grid voltage is established, thuspreventing a screen temperature shiftunder no color conditions when the B -Yamplifier stage is color -killed.
Courtesy of RCA Sales Corp.
V+4051000
R -Y AMPV705 R -Y
,
6C86/5 22K 2.2MEG TO REDGRID
7.04
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CR705
FROMDEMOD R7I9
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CR706
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3300 180PLATE
CKT(NINECONTROL)
CR205
(even though the average may beless than 123v).
Whenever a KC chassis is servicedfor any reason, measure the line volt-age and change the primary tap if eitherof the above conditions exist.
LKX4
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BLEIRN/K
P103
1102
81812 2M
F1015 AMP
SLO BLO
1103
Never attempt this on any KD chas-sis since the tap on the KD chassistransformer primary is for Insta-Viewand not high line voltage.
Procedures for Changing Primary Tap1. Untape the White/Black trans-
former primary lead (this is the128v tap which was taped to theRed/Black lead at the factory).
2. Clip the Red/Black lead from theterminal board and tape over theend of the lead.
3. Connect the White/Black lead tothe terminal board lug previouslyoccupied by the Red/Black lead.
MOTOROLAColor TV Chassis TS924 -Color Sync
Limiter Circuit DescriptionThe loading effect on V19Z (1/2-
5GH8A) imposed by the demodulatorswitching and the hue control networkis minimized by using a pentode whichis a constant current generator (platecurrent is independent of plate voltage).
The continuous color sync signalgenerated by the crystal is tuned byL2S1, C 1 5S1, C14S1 and coupled tothe grid of the limiter. With 18v P -Psync signal here, there is more signalthan grid voltage -plate current "win-dow" to pass it. Consequently, ampli-tude changes occur either beyondmaximum plate current or below cut-off and do not appear in the output. Asa result, a constant amplitude signalrings the plate load transformer (T3S1).
The plate circuit is tuned to 3.58MHzby T3S1 which also splits the signalinto four phases by virtue of the twocenter -tapped secondary windings.From here the sync signal is coupled
62 ELECTRONIC TECHNICIAN/DEALER
FROMV18A
Ti 516 SI
0
L --J 3.9pi.01
1K
VI 9A
1/2 5GH8ACOLOR REF.
OUTPUT/LIMITER
280V TO BASE OF TO EMITTER OF01 SI 01 SI
145V
.01
T3 51
i5PF
12U11
HUE
100
150V
147PF 358MC CW REF TO
Z DEMOD
358MC CW REF TOX DEMOD
to the two demodulators in such aphase as to detect "X" signals at one,and "Z" signals at the other.
To compensate for station -to -stationvariations of color sync phase plus ac-cidental phase shifts caused by wavepropogation, antenna characteristicsand receiver alignment, a manual phaseshift device is required in all color re-ceivers. The "hue" control, as it iscalled, sets the phase of the reinsertedreference carrier so that color demodu-lation occurs along the correct phaseangle's axis. The standard reference, ofcourse, is facial skin color. Only whendemodulation occurs along the X andZ axis in this receiver will proper colorvoltages be passed on to the CRT. Aphase shift error related to the rein-serted carrier doesn't stop the demodu-lation process, but the recovered colordifference signals will not turn the rightCRT gun on or off at the right time.Therefore, reproduced color will beincorrect.
The hue control network is a C/L/Rin series from V19Z's plate to groundand is a variable phase shift combina-tion.
In round numbers, the 15pf capacitor(C20S1) presents about 300011 react-ance. The 12µh coil (L8S1) is a nomi-nal 27011 and can be overlooked as faras phase shift control is concerned.The coil is there to suppress harmon-ics. The hue control (R912) is a 500011potentiometer and is the only circuitvariable in the actual hue controlnetwork.
The CW reference signal deliveredto the demodulators by the secondaryof T3S1 varies in phase with respectto the color sync driving signal as thehue potentiometer is varied. At reso-nance, T3S1 is basically a resistive loadon V19Z. With a change in hue controlresistance, which shifts signal phase atthe plate of V 19Z, reactance is intro-duced in the primary of T3S1. If signalphase is shifted above resonance, theload is primarily inductive reactance;below resonance, the load is capacitivereactance.
The phase response of a transformeris familiar to most technicians. Thephase shift discriminator transformerwith its familiar "S" curve responseis a common example of employing thephase -shift characteristics of a trans-former.
MAGNAVOX
Color TV Chassis T931/T933/T938-Burst Amplifier Tube
The type 6MQ8 is now being used insome chassis instead of the 6KE8.Either the 6KE8 or 6MQ8 can be usedas a replacement since these tube typesare directly interchangeable.
Caution should be observed when re-moving forward bias to evaluate tran-sistor action. Since removing forwardbias turns off collector current, the col-lector voltage rises to its supply voltageand there is a possibility of this voltageexceeding the breakdown voltage onthe transistor. A good rule to apply inthese cases is to note the presence andvalue of the collector load and emitterresistors which will govern the amountof current flow if the breakdown volt-age is exceeded. If these resistors will
limit the current to a value within thepower dissipation of the transistor,there is little likelihood of damage ifthe breakdown voltage is slightly ex-ceeded for a brief interval.
As experience is gained using "incircuit transistor testing," the proce-dure for most transistors will simplifythe following:
Measure collector voltage. If it islower than the supply voltage, the tran-sistor is conducting. With the meterstill on the collector, short the base andemitter together. If the collector volt-age rises to the supply voltage, thetransistor is not shorted and is capableof being turned off. This simplified pro-cedure will not work in all cases, i.e., acollector connected to ground. But asexperience in servicing transistor cir-cuits is gained, it becomes easier to seewhere this technique is applicable andit is a fast, simple way to evaluate atransistor without removing it from thecircuit.
Once it is clearly determined that thecurrent through a particular stage is in-correct, it is usually advisable to re-move the transistor. This will allow youto check the transistor and measure thebias resistor values without the in-accuracies of having the transistorjunctions across them. Every effortshould be made to determine that aparticular stage does contain a defectbefore any attempt is made to removethe transistor.
MID -STATE TUNER SERVICESatisfied with second best? Mid -State offers abso-lute satisfaction and 24 -hour service a necessity.
Mid -State is as close as your nearestpost -office or United Parcel Serviceoutlet. All units tracked and aligned tofactory spec's, with crystal controlledequipment. Ninety day warranty. Muti-lated or damaged tuners may takeslightly longer if major parts are notin stock. Send complete with modeland serial numbers and all damagedparts.
Put your confidence in Mid -State totake care of your tuner problems. "Re-member" there is only one "Mid -StateTuner Service."
COMBO'S - $17.50Major Parts, Tubes, Transistorscharged at Net Price
Distributors -WholesalersWrite for Price Sheet
MID -STATETUNER SERVICEMid -State Tuner Service T-81504 So. College, Box 1141Bloomington, Ind. 47401Tel: (812) 336-6003
.. for more details circle 121 on postcardDECEMBER 1968
I'
63
NEW PRODUCTSFor additional information on products described in this section, circle thenumbers on Reader Service Card. Requests will be handled promptly
Antenna Mounts 708A new line of antenna mounts are
introduced. The Gold Star Line con-sists of six models, all of which includethe necessary mounting hardware forcomplete installation. Tower mounts
TRIPODMOUNT
CHIMNEYMOUNT
(
GUY WIREMOUNT
are offered in 3 and 5ft models, com-plete with 5 and 10ft masts, respective-ly, a 5ft patented tripod mount thatattaches to any type roof, a 10ft chim-ney mount, and 5 and 10ft guy wiremounts. The line features rugged con-struction, Gold Shield finish, andspecial roof sealing pads to make allconnections watertight. All mounts aresaid to install easily in just a few min-utes. The mounts are packaged in indi-vidual display -type cartons. Winegard.
Color Bar Generator 709Announced is an ultra compact, solid-
state color bar pattern generator usedextensively for production testing andfield servicing. The instrument is de-signed for convergence and syn-chronizing adjustments in color andmonochrome TV receivers. Five basicpatterns are displayed: (1) gated rain-bow color bars, (2) square crosshatch,(3) horizontal lines, (4) vertical lines
I- liiiiiiiiiii.on
and (5) small well defined dots. Gunkillers are provided for convergenceadjustments. The only connection ismade to the TV receiver antenna in-put. The unit features plug-in, com-puter -style PC boards and a fullyregulated power supply.
Progressive scanning is used toprevent flickering of the horizontallines. There is reportedly no jitter orcrawl on the dot or line pattern. Theoscillators are crystal controlled;flip-flop and logic circuitry are em-ployed to generate stable and reliablesync, and signal pulses. Only siliconepitaxial planar type transistors areemployed. RF output: Channels 5 and6 selectable; 10mv open circuit frombalanced 30052 source. Patterns: Colorbars: 10 gated rainbow. Crosshatch:Square with 21 vertical and 15 hori-zontal lines. Dots: at intersections ofcrosshatch. Vertical: 21 lines. Hori-zontal: 15 lines. Chroma level:0-200%, continuously adjustable.Power Supply: 105-125v, 50/60Hz;2VA approx. Size and weight: 2'/sin.h x 57/sin. w x 73/4in. d. 2.9 lb. Price$99.50. Leader.
Coaxial Cable 710A low -loss, 100 percent shielded and
sweep -tested 752 coaxial cable espe-cially suited for UHF M ATV distribu-tion systems is now available. The8228 Duofoil cable has a small outer
diameter (only 0.242in.) for extra spacesaving in conduit installation and thecable is easily terminated with standardF -type connectors. Greater flex life forthe 82 -channel cable is claimed byspiral -wrapping the four drain wires forequal distribution of stress. This pro-vides longer service life and preservesthe impedance value of the cable design.
Belden's 100 percent Duofoil shieldis a polyester film with an aluminumlaminant on both surfaces that mini-mizes signal radiation. At the sametime, it protects the signal from degra-dation by auto ignition, electric motors,industrial machinery and other sources
of electrical interference. Further pro-tection of the signal energy field is
accomplished by a low -loss cellularpolyethylene dielectric and a jacket ofblack all-weather polyvinyl chloride.The coaxial cable is available in 100,500 and 100ft. spools. Belden.
Turns -Counting Dial 711A small, lin. dia. turns -counting dial
for application with 7/sin. dia. or smallerprecision potentiometers is introduced.Designated the Model 11, this turns -counting dial provides 11 turns, usinga single counter type wheel and a grad-uated circular dial; a total count of 1099
can be registered. The unit's housing issatin chromium. Brake lever knob andturning knob are both black plastic.Markings are black. The unit is alsoavailable in black with white markings.Standard shaft accommodations forthis unit are 1/4in. and %in. Shaft adap-tor kits for 3/16in. and 3/32in. shaftsare also available on a special basis.Price is quantity $5.81. Spectrol.
Tuner Cleaner 712A new aerosol -type tuner cleaner is
introduced. Specifically formulated fortelevision tuners with critical nuvistorand transistor circuitry, N U V1-TRANprovides a much needed product offer-ing the performance characteristicsand packaging that will find favor withall service personnel. The cleaner isnon-conductive, non-toxic, and claimednot to induce drift or detune neutral-izing circuits. The product goes to workin seconds, is completely safe on allplastics used on TV tuners and willleave no residue on sprayed parts orexposed surfaces. The cleaner is
64 ELECTRONIC TECHNICIAN/DEALER
SERVICE MASTER
HANDIEST
HANDFUL
of service tools
23 essential tools at your fingertips in this light.weight (only 23/4 lbs.), compact, easy -to -carry,roll -up kit. Contains Ion nose plier, diagonalplier, adjustable wrench, regular and stubbyplastic handles with these interchangeableblades: 9 regular and 3 stubby nutdriver, 2slotted and 1 Phillips screwdriver, 2 reamer, 1extension. Eyelets in plastic -coated canvas casepermit wall hanging. New elastic loop securesroll, eliminates need for tying.
many optional accessories:Junior and Tee handles ... Additional nutdriver,Phillips & slotted screwdriver, and extensionblade sizes ...Allen hex type, Bristol multiplespline, Frearson, Scrulox, and clutch head blades...Awl/Scriber...Chuck adaptors to use bladesin spiral ratchet drivers.
WRITE FOR CATALOG 166
XCELITE, INC., 14 Bank St., Orchard Park, N.Y. 14127In Canada contact Chines W. Pointon, Ltd.
. for more details circle 131 on postcardDECEMBER 1968
packed in an 8oz. aerosol can equippedwith a pin -point spray extension forquick, efficient use in tight, confinedareas which are normally hard to reachin many of the smaller sets with otheravailable cleaners. The handy aerosolcan fits in the serviceman's tool kit tobe available for use on service calls.Suggested net price is $2.29 per can.GC Electronics.
Instrument Amplifier 713Announced is a 1969 model Knight -
Kit instrument amplifier with a match-ing speaker system. The 90w peakmusic power amplifier may be used forone instrument or a combination. Thespeaker system includes two Jensen12in. heavy-duty speakers, acousticallybaffled for superior tonal quality andresponse over a wide range. The port-able amplifier rides atop the speakerenclosure and is connected with plug-incord. Field-effect transistors in thepreamp stages are said to assure lownoise level with distortion -free per-formance.
These newmonitor antennaswill drasticallyimprove theperformance ofeven the beof monireceivers.
rNine models
(base and mobile)for high-banqii,
toy -band or dual -bandapplications.
Send coupon nowfor complete
specifications.
meme the antenna=specialists co.El Div. of Allen Electric & Equipment Co.al 12435 Euclid Ave., Cleveland, Ohio 44106
III Name
MI Address UCity
IN State _Zip_ _
Stripes of Quality.
Age1111
Ihmunomandl. for more details circle 102 on postcard
65
Dynaflex*the only practical probefor testingtransistors in circuits.
*PatentPending
Throw away your alligator clips!Dyna-flex, the world's first andonly 3 -point probe, makes instanttest connections to transistors inprinted boards. Easy to use, theDyna-flex probes are spring -mounted on ball joints. Allow youto adjust to any spacing 1/32" to5/8", using only one hand. Dyna-flex eliminates costly unsoldering;can be used to make temporarycomponent substitutions on printedwiring boards. Each point is color -coded for fast, easy identification.Dyna-flex-another engineeringbreakthrough from B&K.Model FP -3, $12.95 user net
B&K Division of Dynascan Corporation1801 W. Belle Plaine Avenue, Chicago, Illinois 60613
Where Electronic Innovation Is A Way Of Life
. . . for more details circle 104 on postcard
NEW PRODUCTS
The unit has dual channels with twoinputs per channel and the normalchannel is designed for lead, rhythm orbass guitar, voice, sitar, etc. Secondchannel features tremolo with separateintensity and rate controls, and rever-beration using the popular Hammondreverb unit for the concert hall effect. Afoot switch jack on control panel per-mits remote switching of reverb ortremolo with foot switch which is in-cluded. Separate treble and bass con-trols allow the operator to boost or cuteither independently. Amplifier meas-urement 5% x 19% x 8%in. Thespeaker enclosure measures 261/2 x 10 x221/4in. The detailed, fully illustratedstep-by-step instructions make it easyto assemble the amplifier kit whichincludes precut wire and solder. PowerOutput: 90w peak music, 30w con-tinuous sine wave power. Bass Boost9db minimum, at 80Hz. Treble Varia-tion: 20db at 10,000Hz. ReverbDepth: (variable) 0-50% min. TremoloDepth: (variable) 0-75% maximum.Tremolo Speed: (variable) 2-10Hz.Controls: Normal Channel - Volume,Treble, Bass, Second Channel -Volume, Treble, Bass, Tremolo In-tensity, Tremolo Rate, Reverb Depth.Signal -to -Noise: 60db below ratedpower output. Input Sensitivity: 40mvfor rated output. Input Impedance:500K. Input Capacitance: 1 Opf maxi-mum. Semiconductors: 16 transistors,6 diodes (includes 4 rectifiers). Price$169.95. Allied.
Wireless CCTV Camera 714A wireless closed circuit TV camera
that operates and transmits pictures toan unused channel of any TV set with-out connection by wire to the set isannounced. This new camera employs
This new E -Vphono needlepackage helps you
buy, sell,then sellagain!
0 On every new E -Vneedle package you'll find
the model number printed three extratimes on pressure sensitive tabs.Here's why:
The tabs can help you order replace-ments. Or keep track of sales. Or youcan stick one on a file card in a follow-upsystem that tells you what and when acustomer last bought (so that you cantell him when to buy again)! Or put a tabon the customer's tone arm to simplifyservice on the next call.
But don't be surprised if one of thetabs is missing. Your E -V distributor maybe using one to keep track of his stock-so that you always have the needleyou want, when you want it.
Smart ideas in packaging of theworld's finest phono service parts helpmake Electro-Voice your best buy.Available only from the parts distributorwith much more than parts to offer!
Ask for your copy of the latest Electro-Voicephono needle/cartridge combined catalog.It's free at your E -V distributor's.
ELECTRO-VOICE, INC., Dept. 12877663 Cecil Street, Buchanan, Michigan 49107
gLeretYckzA SUBSIDIARY OF GULTON INDUSTRIES. INC.
66 ELECTRONIC TECHNICIAN/DEALER
a crystal -controlled transmitter thatsends the picture through the air to astandard TV set where the picture isreceived on either channels five or six,whichever happens to be the unusedchannel in a particular area. The cam-era requires no wires for connectionto the TV, making its installation easierand application more flexible. It elimi-nates the need for tying the cameradown to the monitors and makes it pos-sible to use the camera and set it upquickly for many applications.
In addition to the built-in crystal -controlled transmitter, the solid-statecamera has many features. It is lightweight and compact and has outputsfor both video and RF, switchable toeither video monitor or to standardhome TV receiver. For the sharpestpictures, its vidicon assembly is mov-able back and forth by a knob on thepanel. The lens can also be focused.Its solid-state construction is said tocontribute to its reliability and its plug-in type module design simplifies main-tenance. Used with video monitors, itcan provide sharp detail, a horizontalresolution of more than 550 lines. Itreportedly can operate under almostany lighting conditions and can adjustchanging light conditions from brightlight to dark without blanking out. Ithas automatic light compensation overa range from 4000 to I. Model WS822is $495. G BC.
Solder 715A complete line of solders and solder
products for electrical work and forjoining all types of metal surfaces, isintroduced. The line is developed forthe novice who needs to be informed of
the solder alloy that will give the bestresult for his application. Depend -a -Bond is said to be the most completeline of consumer solder products fromone source. It includes specific soldersfor every application: for repairingradios, clocks, appliances, flatware,jewelry, chrome trim, cars, boats,gutters, antennas, piping, tools, etc.It can be used with most metal surfaces- stainless steel, chrome, nickel, brass,copper, aluminum, silver and their al-loys. Solder products are sold in handy,economical blister packs, individualcartoned spools and bars. Packages aredesigned for easy storage and are color
coded for quick selection. Each pack-age contains complete, easy -to -followinstructions and a comprehensive listof applications. Alpha Metals.
Test Probe 716Announced is a new test probe re-
portedly providing, for the first time,a practical method for making threetermination touch -to -test contacts si-multaneously using only one hand. Upto now, it has taken three separateprobes, requiring the use of both hands,to test transistors, diodes and othercompact components mounted onprinted boards. The new three-pointprobe designqd specifically for use with
in -circuit transistor testers, vtvm's,vom's and tvom's the "Dyna-Flex" issaid to provide positive, non -slip directand can be used with one hand whenmaking connections.
The probe has three spring -loadedneedle -point tips which tilt or swivelon ball joints to permit automatic ad-justment to any spacing from 1/32 to5/8in. to fit the terminations of a widevariety of components. Three leads,color coded to their respective tips,terminate in insulated alligator clips foreasy connection to the test instrumentbeing used. The clips also permit rapidcomponent test substitutions. B & K.
Bending Clamp 717Announced is a precision device for
fast, accurate bending of resistor, ca-pacitor and diode leads for printedcircuit and allied uses. The H ICO-USA lightweight aluminum clamp isclaimed to be easily adjusted and quick-ly handled by female operators. Each
'I.! ' ' ! " I
bent lead will be identical - withoutlead strains or cracks. I.eads may beup to 13/4in. long and can be bent towithin 1/16in. of the ends of compo-nents. Price $12.95. Horizons Interna-tional.
ALLIED NEW 1969 CATALOG
& BUYING GUIDE
EE!ALLIED
EORLECRONICSEVETRYONE 1969
Ote% 4141,11...lee ed0.11.4 del
For top savings, shop by mail fromthe world's most famous catalog ofelectronic equipment, featuringhundreds of new and exclusive itemsand special Allied values.
536 pages-including a completeElectronic and Hobby Kits Catalog-picturing, describing, and pricingthousands of items. The most com-plete inventory ever assembled ofHi-Fi, Radios, Tape Recorders, CB,Electronic Equipment, Parts andTools... allat money-sauinglowprices.NO MONEY DOWN -24 MONTHS TO PAY!
BIG SAVINGS ON THE BEST
IN ELECTRONICS FOR EVERYONE
Stereo Hi-Fi Electronic & Hobby Kits Tape Recorders & Tape CB 2 -way Radios Walkie-Talkies FM -AM 8 AM Radios Shortwave Receivers Portable TV Phonographs
Amateur Equipment Intercoms & PA Automotive Electronics Test Instruments TV Antennas & Tubes Power Tools, Hardware Tubes, Transistors Parts, Batteries, Books
WRITE FOR YOUR COPY TODAY! '
ALLIED RADIO, Dept. 512P.O. Box 4398, Chicago, III. 60680Send me your free catalog for 1969
PLEASE PRINT
NAMEFirst
ADDRESS
Middle Last
CITY
STATE ZIP
DECEMBER 1968
... for more details circle 101 on postcard67
ANTENNAS AND ACCESSORIES Porta-Color TV-New 14in. CRT 4/68-75Selling and Installing MATV Systems 2/68-44 Color TV Chassis KC/KD- Using CRT 25XP22 toAntennas -Sans Bafflegab and Bushwa 3/68-49 Replace 25AP22A 4/68-77Selling and Installing MATV Systems 4/68-42 Color TV Chassis KC/KD- VerticalAntennas -Sans Bafflegab and Bushwa 5/68-49 Sweep Failures 5/68-70Selling and Installing MATV Systems 6/68-44 Color TV Chassis KC/KD-Service Information 5/68-70Antennas -Sans Bafflegab and Bushwa 7/68-43 Color TV Chassis KC-Service Hints 6/68-64Installing MATV Systems 8/68-51 Color TV Chassis KC/KD-Core Spacers in HVSelling and Installing MATV 10/68-58 Transformers 7/68-58Selling and Installing MATV Systems 12/68-53 Portable Color Model M235GWD-1 - 15MP22 CRT
Modification 7/68-59BUSINESS Color TV Chassis KD - Thermostat Added 7/68-59Making a Go at Two -Way Radio 1/68-39 Color Chassis G -I -CRT Socket with Built-inWe Visit a Successful Two -Way Communications Spark Gap 8/68-66
Operation 1/68-57 TV Chassis GI -HV Arcing 8/68-66Who's Selling What, Where and How? 1/68-61 Color TV Chassis KD-Tape on ThermostatTwenty -One Years of Continuous Growth 2/68-58 Surface 8/68-67The Small Business Entrepreneur Still Lives 2/68-61 Color TV Chassis KC Model M278CWD-Marine Electronics Sales and Service 3/68-41 Loose Antenna 8/68-67What about the Audio Communications Equipment TV Chassis H I -New Damper Tube 8/68-67
Business9 3/68-52 Color TV Chassis H I -Service Hints 9/68-68Light -Hearted Approach Wins Sales 3/68-62 Color TV Chassis KC/KD-Service Hints 10/68-88No Secrets to Merchandising 3/68-65 Color TV Chassis KC- High Voltage Tap onMaking a Go at Two -Way Radio 4/68-46 Power Transformer 10/68-62Partnership to Profits 4/68-58Service Dealer and the BBB 4/68-62 MagnavoxThe Photoelectric Controls Business 5/68-45 All Color TV Blue Lateral and Purity Devices 1/68-64Business Marriages and Cooperative Efforts Pay Off 5/68-55 Instant Automatic Remote Control-Automatic OffSells 7 out of 10 Who Enter His Shop 5/68-57 and VHF Search Tune Circuit Description 1/68-64Toss a Bouquet to Your 'Girl Friday' 5/68-59 Color TV Chassis T919/T920 - Horizontal Centering ... 3/68-80The Growing Home Entertainment Market 6/68-37 Color TV Chassis T924 - Horizontal Output Circuit 3/68-80How To Make More Money and Live Better 6/68-51 Color TV Chassis T924 Color AFPC Adjustment 5/68-70Thirty -Eight Years of Two -Way Radio 6/68-53 TV Chassis T925 Replacement 2I KA6 Tubes 8/68-68Computerized TV Business 7/68-46 Color TV Chassis H 12- B+ Dropping Resistor 8/68-68How To Make More Money 7/68-49 Color TV Models T9I I /T918/T919/T920/T931 -Two Corporations Operate as One 7/68-51 Line Voltage Tap 9/68-75He Took Chances and Made Them Pay 8/68-54 Color TV Chassis T911/T919/T920/T931 -No -Go Radio Business Prospers 8/68-57 New Focus Transformer 9/68-75Services Only What He Sells 6/68-60 TV Chassis T927 Christmas Tree Effect 10/68-90Selling by Service Reputation 9/68-56 Color TV Chassis T93 1 /T933/T938-Burglar Alarms for Profit 9/68-59 Burst Amplifier Tube 12/68-63Making a One -Man Go of It 9/68-62Breakthrough to Video Tape 10/68-66 MotorolaPurple Trucks and Yellow Letters 10/68-70 Color TV Chassis TS915/9 I 9 - Noise Protection,Neighborhood TV Business 10/68-74 Sync and AGC Circuits 5/68-71TV Sales in Spanish 11/68-58 Color Chassis TS9I4/918 - Short Life 6JS6Profits in Tube Rebuilding 11/68-61 Horizontal Output Tube 8/68-66TV Holiday 12/68-48 Color Chassis TS915/919 - Service Tips 9/68-74Breadth Not Depth 12/68-50 Color Chassis TS921-Color Killer Adjustment on
Chassis Coded 'B-00 and Later' 10/68-88COLORFAX Color TV Chassis TS918 - Service Tips 10/68-90Admiral Color TV Chassis TS915/TS9 19- Service Tips 10/68-90
Color TV Remote Control I 1A9N/S376AN -Circuit Color TV Chassis TS924 -Color Sync LimiterDescription and Operation 2/68-74 Circuit Description 12/68-62
Color TV Chassis H 10/H 12 Series-Focus ControlModification 2/68-74 Olympic
Color TV Chassis 4H 12 -Control Cluster Removal 8/68-68 Color TV Chassis CTC I9/20/21 -Color TV Chassis 611/G13/H12/K15 - Loss of Blue Service Information 5/68-72
or Red 10/68-88 Color TV Chassis CTC 19/21 - Spark Gap Functionsand Causes of Failure 7/68-58
Canadian General Electric Color TV Chassis CTC19/20/21 -Service Hints 9/68-68Color TV Chassis M663- Vertical Green and Purple Color TV Chassis CT910- Lack of Video Gain 10/68-94
Stripes, 3/68-80 Color TV Chassis CT9I I -No Sound 10/68-94Color TV Chassis M678/M679-Poor Color 3/68-80
Philco-FordGeneral Electric Color TV Chassis 14M91/15M91/16M91-
Color TV Chassis KC and CB- Impurity Problems 1/68-64 High Voltage Adjustment 8/68-68
68 ELECTRONIC TECHNICIAN/DEALER
RCA VictorColor TV Chassis CTC30- Description of the
Integrated AFT Circuit 2/68-76Color TV Chassis-Checking the VDR 2/68-78Non -Remote Power Tuning CTC30 Chassis-
Channel Skipping 5/68-73Color TV Chassis CTC36 -Vertical
Circuit Description 11/68-73Color TV Chassis CTC38- Difference Amplifiers
Circuit Description 12/68-62
SylvaniaColor TV Chassis D02, D10-Focus Voltage and
HV Circuit 4/68-76Color TV Chassis D06/D07/D09/D10-Convergence
Problems 6/68-62Color TV Chassis D12/D13-'X' and 'Z' Demodulators
Circuit Description 10/68-88Color TV Chassis D12/D13-ACC and Color
Killer Circuits 11/68-76
WestinghouseColor TV Chassis V2655- Demodulator Circuit
Description 4/68-72
COLOR TV
A Technician Looks at RCA Victor's CTC22Color Chassis 1/68-46
Servicing Color TV Horizontal Sweep Circuits 1/68-50Solving Difficult Color Problems 2/68-39Three Down 3/68-59Chasing Color Troubles with a Scope 4/68-37Servicing Color TV Horizontal Sweep Circuits 5/68-41Exploring Zenith's Small Screen Color Portable 6/68-40Let's Take a Look at Admiral's 4H12 Color Chassis 7/68-31Chroma Circuit Troubleshooting Tips 7/68-39Servicing the Color Tigers 9/68-41Preview of 1969 Color TV 10/68-45Is It or Is It Not the CRT 10/68-51What You Can Expect in Television for 1969 11/68-39Vectorscope Servicing 11/68-42Getting Acquainted with Philco-Ford's
19QT87 Color TV ChassisLet's Examine Sylvania's Gibralter TV Chassis
MISCELLANEOUS
11/68-5212/68-43
Servicing the Solid -State GDO 9/68-52TV Remote Controls 10/68-54Fuses and Circuit Breakers 11/68-50
RADIO COMMUNICATIONS
Making a Go at Two -Radio 2/68-47Marine Electronics Sales and Service 3/68-41What about the Audio Communications
Equipment Business9 3/68-52Making a Go at Two -Way Radio 4/68-46
SEMICONDUCTOR TECHNOLOGY
Semiconductors from A to Z 1/68-53Semiconductors from A to Z 2/68-54Semiconductors from A to Z 3/68-54Semiconductors from A to Z 4/68-53Solid -State Audio Amplifiers 5/68-52Semiconductors from A to Z 6/68-47Solving Difficult Solid -State Auto
Radio Problems 8/68-41Semiconductors from A to Z 8/68-47Semiconductors from A to Z 9/68-46Servicing the Solid -State GDO 9/68-52Semiconductors from A to Z 10/68-60Semiconductors from A to Z 11/68-46
STEREO AND AUDIO EQUIPMENT SERVICING
Using Audio Test Instruments
DECEMBER 1968
2/68-50
makes first classsoldering the easiest
part of any job
Theoriginal Dual Heat
Soldering GunsPreferred by technicians for their
fast heating copper tips, exclusivetrigger -controlled dual heat, and highsoldering efficiency. Available in 3 watt-
age sizes, each with spotlight.
100/140watt Model 8200, 145/210 -wattModel D-440, and 240/325 -watt ModelD-550. Also in complete kits:
Dependable MARKSMAN Ironsin a size for every job
Ideal for deep chassis work and continuous -duty soldering,Marksman irons outperform others of comparable size andweight. All five feature long -reach stainless steel barrelsand replaceable tips.
25 -watt, 13/4 -oz. Model SP -23 with 1/3" tip (In kit with extra tips,soldering aid, solder-Model SP -23K)
40 -watt, 2 -oz. Model SP -40 with Va" tip
80 -watt, 4 -oz. Model SP -80 with 3/s" tip 120 -watt, 10 -oz. Model SP -120 with 1/2" tip 175 -watt, 16 -oz. Model SP -175 with 5/s" tip
1*
25 -watt Technician's Ironfor intricate circuit work
atisiV04121=1=10,
Industrial rated pencil iron weighs only 1% ounces, yet deliverstip temperatures to .860°F. Cool, impact -resistant handle. Allparts readily replaceable. Model W -PS with 1/2 -inch tapered tip.
Also available: A new Battery Operated Iron for use with 12volt battery or 12-24 volt AC/DC source. Complete with 12 ft.cord and battery clips. Model TCP-12.
Complete Weller Line at your Electronic Parts Distributor.
WELLER ELECTRIC CORPORATION, Easton, Pa.WORLD LEADER IN SOLDERING TOOLS
. for more details circle 130 on postcard
69
Using Audio Test and Alignment Instruments 4/68-50Solid -State Audio Amplifier 5/68-52The Growing Home Entertainment Market 6/68-37Approach to Circuit Analysis 12/68-37
TECHDIGEST
AdmiralPower Tuning Portable Radio Model YK367-AM
Weak or Intermittent 1/68-32Tape Recorder Model CTR300-Battery Life 10/68-42Transistor Testing and Substitution 10/68-4250HZ and Phono Conversion 11/68-30
Canadian General ElectricColor TV Chassis 19 and 25in.- HV Transformer
Replacement 1/68-34Amplifier Chassis M683-Pulse-Noise Radiation
from the Power Supply 3/68-32TV Chassis M664- Volume Control Damage 8/68-32Phono Chassis M686-Audio Circuit Alterations 8/68-32Amplifier Chassis M683-Poor Bass Response-
Earphone Hum and Hiss 8/68-32TV Chassis M664 Codes 'X' and 'W'-
Production Changes 8/68-34
Delco-Radio1968 Olds Radio-Loose Tone Control 681-2 9/68-30Tape Player Model T200- Replacing Cartridge Plate 9/68-30Tape Player Model T400-Circuit Change 9/68-30
General ElectricTV Chassis AY Through AD-B+ Fuse 8/68-32Current Portable TV -Quadrature Coil Tuning
Capacitor 12/68-28TV Chassis V -VHF Tuner 300t1 lead dress 12/68-28TV Chassis SB/SC- Lightning Protection 12/68-28Modification Procedure 12/68-28
E. F. Johnson Co.FM Two -Way Radio Model 242-502, 503-Receiver
Circuit Description 2/68-28FM Two -Way Radio Model 242-502, 503-
Transmitter and Power Adapter CircuitDescription 4/68-28
MagnavoxInstant Automatic Remote Control- ReceiverCircuit Description 3/68-32Transistor TV Chassis T908-Troubleshooting the
Horizontal Circuits 7/68-26Model 1V9000 Tape Recorder-Erratic Speed 11/68-34Stereo Theatre Models T933/R220-Raspy Sound 11/68-34Distorted Audio in TV Sets 8/68-34TV Remote Control Receiver Model 704044-
Locating Bracket 8/68-38TV Chassis T908/T915- Failure of
Capacitor C615 8/68-38Tape Recorder Model 1TC108- AC Adapter Plug 10/68-37Correction Note on Focus Transformer 361306-2 10/68-37
MotorolaTape Player Model TM706-Circuit Descriptions 5/68-30TV Chassis TS594-Noise Gate Circuit Description 7/68-26Tape Player Models TM7065-1/TM707S/TM708S/
TM709S-Failure to Index 10/68-37TV Chassis TS592-Service Tips 10/68-37TV Chassis TS592/TS612-Troubleshooting by
Transistor Isolation 10/68-37TV Chassis TS597-Service Tips 10/68-42Checking a Transistor with the Transistor
in Place 11/68-30
OlympicColor TV Chassis-Circuit Modifications 1/68-28
Pearce -SimpsonCitizens Band Radio Companion IV -
Circuit Description 6/68-28
RCA VictorTV Receivers-Function of Yoke Thermistor 1/68-28Amplifier Chassis RS238-Circuit Description 3/68-32Tape Recorder, Models YJC22, MJC28, YJG42/
52YJ H32/36/38, MJG66/26- Isolating/DecouplingCircuits 3/68-38
TV Chassis KCS153- Vertical Deflection CircuitDescription 4/68-32
TV Chassis KCS153 -Transistorized AGCCircuits 5/68-32
Using the Scope for Horizontal Circuit Testing 7/68-29
SylvaniaFM Stereo Multiplex Decoder-
Circuit Description 11/68-32Testing Field Effect Transistors 12/68-32
WestinghouseTransistor TV Chassis V2483-1 - Vertical Jitter,
Vertical Instability 6/68-30
ZenithTransistor Chassis 1Y21B55-Horizontal Osc and
Output Circuit Description 1/68-28FM Multiplex Receiver Chassis 25ZT120-FM/AGC
Circuit Description 9/68-32
TEST INSTRUMENTS
AC and DC Oscilloscopes 1/68-42Making a Go at Two -Way Radio 2/68-47Using Audio Test Instruments 2/68-50Triggersweep Your Old Scope 3/68-45Using Audio Test and Alignment Instruments 4/68-50Move Up to a Triggered -Sweep Dual -Trace Scope 5/68-37Move Up to a Triggered -Sweep Dual -Trace Scope 7/68-35
Heath Model 10-17 and Model 1M-17 TestInstruments 8/68-45
Amphenol Model 857 and Model 865 TestInstruments 9/68-50
Testlab Report on Knight Color Generator 10/68-77Testlab Report on Heath IG-14 Marker Generator 11/68-64Testlab Report on Sencore Model FE16 Field
Effect Meter 12/68-48
TV -RADIO SERVICING
Servicing Color TV Horizontal Sweep Circuits 1/68-50Solving Difficult Color Problems 2/68-39Three Down 3/68-59Chasing Color Troubles with a Scope 4/68-37Making a Go at Two -Way Radio 4/68-46Servicing Color TV Horizontal Sweep Circuits 5/68-41Move Up to a Triggered Sweep Dual Trace Scope 7/68-35Chroma Circuit Troubleshooting Tips 7/68-39Solving Difficult Solid -State Auto Radio Problems 8/68-41Servicing the Color Tigers 9/68-41Is It or Is It Not the CRT 10/68-51TV Remote Controls 10/68-54Vectorscope Servicing 11/68-42Fuses and Circuit Breakers 11/68-50Approach to Circuit Analysis 12/68-37
MOVING?
Be sure to let us know your new address.
Please enclose a complete address label
from one of your recent issues.
70 ELECTRONIC TECHNICIAN/DEALER
NEWSOF THE INDUSTRY
Stereo QuarterlyAppears on Newstands
The first or fall 1968 issue of a newquarterly, STEREO, has been placedon newstands across the country.Formerly published as an annual byHIGH FIDELITY magazine, a divisionof Billboard Publications, Inc., STEREObecomes a quarterly with its fall 1968issue. Price is $1. The second or winter1968 issue will appear in late December.
Norman Eisenberg, who edited theannual, is editor of the quarterly, whilecontinuing as audio -video editor of themonthly HIGH FIDELITY.
"In going quarterly, STEREO fills agrowing need," said Eisenberg, "for apopularly written periodical that coversa broad range of equipment and its usein the home, as well as records andtapes from the standpoint of their useas program material to feed to thatequipment." The first issue containsarticles on how to tell real Hi Fi equip-ment from imitations, a survey of kits,hints on upgrading TV sound, andevaluation of cassettes, a critical lookat magazine test reports, "Tips forTapesters," decor and installationphotos, reviews of outstanding sonicreleases and news of interest to con-sumers.
ICS Offers TV Servicing,Repair Course
A major new sales program, availablefrom G/L Tab Books, Blue Ridge Sum-mit, Pa., (publishers of the GernsbackLibrary) allows parts distributors toprofitably participate in the training ofneeded TV service technicians.
The course can also serve as a draw-ing card to bring new customers intothe distributor's store.
Developed by International Corres-pondence Schools, 79 -year old leaderin home -study education, the ICS TVServicing/Repair Course consists ofsix large, carefully planned and fullyillustrated texts to produce qualifiedtechnicians in six months... with noprior training.
Participants in the course also, uponsuccessful completion, will receive thefamous ICS diploma, attesting to hisskills. Additionally, students receive a24 -model portfolio of TV schematics,an electronics dictionary, free counsel-ing service and membership in the ICSTV Servicing Academy.
The entire program, based on theworld-famous ICS method of teaching,lists for only $99.... less then half thecost of any previous course on the sub-ject. An easy -pay plan is also availablefor students.
DECEMBER 1968
Completely practical and thoroughlyreviewed by industry experts, thecourse has been endorsed by the Na-tional Electronics Assn.
Tape Record Heads TellWhen They Are About Worn Out
Michigan Magnetics has developeda system for telling when a tape re-corder head is wearing out. Called"Spot Check," the head is so con-structed that a red indicator appears onthe face of the head when there areabout 100 hours of useful life left.
For the first time the consumer willbe forewarned that a head is about to
wear out, and he can avoid the disap-pointment of making a recording onlyto find that the head had failed. Just asimportant, the user of a recorder willknow when the head is not worn out.
With the widespread commercial useof tapes, the head will be welcomed bythe broadcast industry, language lab-oratories and suppliers of backgroundmusic where service contracts are used.
The heads will also be a boon to theservice industry, as the repair man willknow definitely whether or not a headis worn out and can warrant a tape re-corder without worrying about the gapopening within the normal warrantyperiod.
How to break into the big moneyservicing 2 -way radios!HOW WOULD YOU LIKE to start collecting your
share of the big money being made inelectronics today? To start earning $5 to $7 anhour... $200 to $300 a week... $10,000 to$15,000 a year?
Your best bet today, especially if you don'thave a college education, is probably in thefield of two-way radio.
Two-way radio is booming. Today there aremore than five million two-way transmittersfor police cars, fire trucks, taxis, planes, etc.and Citizen's Band uses-and the number isgrowing at the rate of 80,000 new transmittersper month.
This wildfire boom presents a solid gold op-portunity for trained two-way radio serviceexperts. Most of them are earning $5,000 to$10,000 a year more than the average radio -TV repair man.
Why You'll Earn Top PayOne reason is that the U.S. doesn't permit any-one to service two-way radio systems unless heis licensed by the FCC (Federal Communica-tions Commission). And there aren't enoughlicensed electronics experts to go around.
Another reason two-way radio men earn somuch more than radio -TV service men is thatthey are needed more often and more desper-ately. A two-way radio user must keep thosetransmitters operating at all times, and musthave them checked at regular intervals by li-censed personnel to meet FCC requirements.
This means that the available licensed ex-perts can "write their own ticket" when itcomes to earnings. Some work by the hour andusually charge at least $5.00 per hour, $7.50 onevenings and Sundays, plus travel expenses.Others charge each customer a monthly re-tainer fee, such as $20 a month for a basestation and $7.50 for each mobile station. Asurvey showed that one man can easily main-tain at least 15 base stations and 85 mobiles.This would add up to at least $12,000 a year.
How to Get StartedHow do you break into the ranks of the big -money earners in two-way radio? This is prob-ably the best way:1. Without quitting your present job, learnenough about electronics fundamentals to passthe Government FCC Exam and get yourCommercial FCC License. Then start gettingpractical experience in servicing two-way radiosystems in your area.2. As soon as you've earned a reputation as anexpert, there are several ways you can go. Youcan add mobile radio maintenance to the pres-ent services offered by your shop, or start your
ENROLL UNDER NEW G.I. BILLAll CIE courses are available under the newG.I. Bill. If you served on active duty sinceJanuary 31, 1955, or are in service now,check box in coupon for G.I. Bill information.
own separate mobile radio business. You mightbecome a franchised service representative ofa big manufacturer and then start getting intotwo-way radio sales, where one sales contractmight net you $5,000. Or you may be invitedto move up into a high -prestige salaried jobwith one of the major manufacturers.
The first step-mastering the fundamentalsof electronics in your spare time and gettingyour FCC License-can be easier than youthink.
Cleveland Institute of Electronics has beensuccessfully teaching electronics by mail forover thirty years. Right at home, in your sparetime, you learn electronics step by step.Our AUTO-PROGRAMMEDTM lessons and coach-ing by expert instructors make everything clearand easy, even for men who thought they were"poor learners." You'll learn not only the fun-damentals that apply to all electronics designand servicing, but also the specific proceduresfor installing, troubleshooting, and maintain-ing two-way mobile equipment.
Your FCC License...or Your Money Back!By the time you've finished your CIE course,you'll be able to pass the FCC License Examwith ease. Better than nine out of ten CIE -trained Men are able to pass the FCC Exam,even though two out of three non -CIE menfail. This startling record of achievementmakes possible our famous FCC License War-ranty: you'll pass the FCC Exam upon com-pletion of your course or your tuition will berefunded in full.
Find out more. Mail coupon for two FREEbooks, "How To Succeed In Electronics" and"How To Get A Commercial FCC License."
CIECleveland Institute of Electronics1776 E. 17th St.. Oept. ET -45. Cleveland. Ohio 44114
rCleveland Institute of Electronics1776 E. 17th St., Cleveland, Ohio 44114Please send me without cost or obligation:1. Your 40 -page book "How To Succeed InElectronics" describing the job opportunitiesin Electronics today, and how your coursescan prepare me for them.2. Your book on "How To Get A Commer-cial FCC License."
Name Age_(please print)
Address
City
1
State Zip0 Check here for G.I. Bill information.Accredited Member National Home Study Council. Er -4e
L - I. . . for more details circle 107 on postcard
71
QUIETROLEThe Original Control
andSwitch Lubri-Cleaner
The oldoest. mostreliable and efficientproduct obtainable for
positive lubrication and
cleaning of TV Tuners,
Controls and Switches.Harmless tc plasticsand metals. Zero effects
on resistance and
capacity. Non-inflam-mable-non-conductive-non-corrosive.
The Choice of Better
Servicemen, Everywhere.
For Color andBlack and White
Available in Aerosol or BottleProduct of
QUIETROLECOMPANY
Spartanburg, South Carolina
. . for more details circle 124 on postcard
WAVE FORM ANALYSIS& PEAK FM MODULATION
all for LESS MONEY!The Lampkin 205A FM Modulation Meteraccurately indicates PEAK modulation onmobile transmitters. To shoot troublevisually, use your own general-purposeoscilloscope at the 205A rear jack out-put. This makes a low-cost, highly effec-tive test combo - and a well-roundedshop - all for less money.Lampkin pioneered the PEAK voltmeterfor FM modulation indication.
Like to see the complete specs? Mailcoupon today!
Use this coupon for FREE booklet "HowTo Make Money in Mobile -Radio Main-tenance" and information on Lampkinmeters.
NameAddress
City State Zip
LAMPKIN LABORATORIES, INC.Div. II , Bradenton, Fla. 33505
CATALOGS Et
BULLETINS
Electronic Supplies 400A 350 -page catalog lists many thou-
sands of electronic products producedby 126 manufacturers. In addition, thecatalog lists 71 manufacturers whoseproducts are available but are not listedin the book because of space limita-tions. The catalog carries prices whichare guaranteed up-to-date at press time.O.E.M. quantity prices are providedwhere applicable. The illustrated bookoffers a complete selection of elec-tronic supplies, including electroniccomponents, commercial sound sys-tems, videotape recording systems,background music systems and inter-coms. The catalog also describes awide range of public address, amateur,CB and test equipment. Satterfield.
Color Video Tape 401An eight -page booklet describes the
VR400, a new 1 in. color video taperecorder. The four-color booklet ex-plains the need for this particular 1 in.format; lists typical video tape applica-tions, features and specifications. Gen-eral Precision.
Electronic Instruments 402A condensed catalog of electronic
instruments is released. In addition todetailed descriptions and specificationsof the company's rapidly growing prod-uct line, the 16 -page brochure describesthe West Caldwell facility, production,quality assurance, warranty and servicepolicies. Domestic and internationalfield engineering representative firmsare listed. Electronic instruments inwhich integrated circuits are used in-cludes counter/timers, frequency coun-ters, pulse generators, frequency syn-thesizers and digital clocks. Monsanto,
Electronic & Electrical Books 403Publishers of the Gernsback Library
books have released their fall 1968catalog. Describing over 100 currentand forthcoming books, the illustrated16 -page catalog covers the followingsubject areas: broadcasting; basic tech-nology; CATV; electric motors; elec-tronic engineering; television, radioand electronics servicing; audio andHi Fi; hobby and experiment; test in-struments; and transistors. Tab Books.
General Catalog 404A general catalog, No. 280, "Elec-
tronics for Everyone" is now available.The 536 -page general catalog presentsthe latest in major brands of high fidelitycomponents and tape recorders; video-
tape recorders, monitors and cameras;transistorized FM -AM and shortwaveradios; phonographs and turntables;TV portables in various screen sizes;AM and FM -AM car radios and carstereo tape players; walkie-talkies andother Citizens Band two-way radiosand accessories; Radio Amateur (Ham)gear; sound equipment and intercoms;microphones and speakers; test instru-ments; power supplies and converters;auto and motorcycle electronics acces-sories; a wide selection of do-it-your-self kits; antennas and towers; electricalaccessories; electronics parts; receiv-ing and special purpose tubes; TVpicture tubes; semiconductors; wireand cable; tools; and technical books.Allied.
Recorder Heads 405A new 20 -page, two-color catalog
contains mechanical and electricalspecifications and typical responsecurves for production heads. A selec-tion from the heads illustrated in thiscatalog will meet almost all require-ments for full-, half-, quarter-, eight -track and cassette heads. MichiganMagnetics.
Amplifiers and Accessories 406A six -page short -form catalog of
commercial sound equipment -includ-ing amplifiers, booster, tuners, tapeplayers, systems and accessories isavailable. Featured in the catalog, mostof which is reprinted from the 1969edition of Radio -Electronic Master, isthe new "MOD Series" modular ampli-fiers with eight different modular inputscapable of comprising up to 256 differ-ent amplifier configurations. Alsoincluded are the "TPA Series" transis-torized power amps and the conven-tional "Carillon Series" tube amplifiers.Bell P/A.
CIRCUIT ANALYSIS...continued from page 42
up as a load line and two equivalentcircuits, showing that even simplecircuits may act like complex ones.
Other ApplicationsSo far we have discussed dc -like
circuits and the Thevenin andNorton equivalents that describethem. There is another field inwhich the same equivalents work ifwe are careful. We can analyzepulse circuits, too, into Theveninand Norton equivalents.
72 ELECTRONIC TECHNICIAN/DEALER
When we are dealing with pulsecircuits, we simply imagine theinside perfect generator produces apulse rather than a dc output. Andwe assume the equivalent resistorhas a constant value. This assump-tion is not true in real circuits butif we use the correct approach, itworks anyway.
Our key to this application is touse the equivalent circuit for onlypart of the operating cycle, andthen find a new equivalent circuitfor the next part of the cycle. Thissounds like a lot of work and per-haps rather risky, but it works wellin practice because two equivalentsare usually enough to analyze thecomplete operating cycle. It isgenerally very clear where one partof the operating cycle ends andanother begins.
For instance, suppose we wantto explain the operation of anastable multivibrator. This requirestwo equivalent circuits correspond-ing to very definite circuit events.One equivalent describes thecircuit as it goes into saturationafter being turned on, and the otherwill cover as it settles toward cutoffafter receiving a turnoff signal. Trythis approach to explain how theastable works, and to estimate itsfrequency of oscillation.
Here is some help. The sine -wave picture, in which things getalong at about the same rate all ofthe time, doesn't work here. In-stead, events start with a large up-heaval as the OFF state seems tojump from one transistor to theother. This is followed by a gradualdrifting period in which the volt-ages gradually slump back to ap-propriate values for another surge.Then the OFF state jumps again,and its jumping back and forth gives
a good illustration of how theastable operates.
A TV deflection yoke and itsdriving system offer another ex-ample. The yoke requires a saw -tooth current input. Try sketchingout the sweep and retrace equiva-lent generators, and estimate thevoltage signal you actually observeacross the yoke. Now, if you had aThevenin generator applying thatvoltage signal to the yoke, whatcurrent signal would you find?
You've convinced a good friendthat designing his own circuits isn'tso hard after all. He's returned with
a simple power supply containing a24v transformer, a full -wave bridgerectifier, and a I Opf surpluscapacitor.
The capacitor seems healthyenough and there don't seem to beany shorts, but the circuit hasblown several fuses and diodes.This always seems to happen justafter it's turned on. Use anequivalent circuit to explain to himwhat is happening, and suggestsomething he can do about theproblem. If you have some ther-mistor literature, pull it out. It'llhelp.
Ten More PopularColor TV Coil Replacements
Cat. No. Function Manpfacturer Part No.6355 Dynamic Convergence Admiral 94C305-66058 Chroma Bandpass Emerson 7205636356 Blue Phasing GE ET36X7896059 Burst Phase Hoffman 109-0337006357 Pin Cushion Motorola 24C65127A90
6060 Chroma Take -Off Philco 32-4878-26358 Horizontal Linearity RCA 1207946359 Horiz-Osc. & Waveform Silvertone 10-88-57150 Sound Take -Off Sylvania 50-16206-56061 3.58 mHz Osc. Wells Gardner 9A2660-001
Write for your copy of Cross Reference Bulletin 1068
J.W. MILLER COMPANY5917 South Main Street Los Angeles, California 90003
SEE YOUR LOCAL DISTRIBUTOR FOR THE FULL LINE OF RF AND IF COILS, CHOKES, FILTERS AND TRANSFORMERS
... for more details circle 122 on postcard
IT'S
Kay -Townes obsoletes the old"pass through" coupling systemdetrimental to color reception!Revolutionary, new design hashigh gain, 9 driven element UHFantenna coupled to VHF section, ac-tually tuning the VHF section. Doublestub UHF trap gives 100% isolation.Corner reflector doubles as high gainUHF reflector and broad, high band, highgain director on VHF channels.
A NEW CONCEPT OFANTENNA DESIGN
FROM
CT -18, 24, 30, 34, 42
KAY-TOWNESANTENNA CO.P. 0. Box 593
Rome, Ga. 30161
DECEMBER 1968
. for more details circle 116 on postcard73
4141ti The NEWt" NO. 800TUN-0-LUBE
TUNER CLEANER
S.FORMULATEDFOR TV -TUNERSUSING NUVISTORS &
TRANSISTORS
NO TUNER DRIFT
NO. 800
$1.98DEALER
NET
Nuvistors and Transistors are highlysensitive to drift from ingredientsin most ordinary TV tuner cleaners.Drift has been found to cause callbacks and expensive tuner repairs.For over 18 months CHEMTRONICShas been formulating and testingthis new cleaner in both the laband field. Under the most criticaltest, there has been NO DRIFT onscope patterns. We invite you to trythis test yourself.
SUPERtNo. 1550
Agodet er.dt
SUPERFROST AID
Cools Faster LeavesNo Liquid Residue
SUPER FROST AID is a fastercircuit freezer designed tolocate intermittent compon-ents . without leaving aliquid residue.
BROOKLYN N. Y. 11236. . . for more details circle 106 on postcard
AD INDEX
Allied Radio Corp 67
American Telephone & Telegraph3rd Cover
Antenna Specialists Co 65
B & K Div., Dynascan 2nd Cover, 66
Borden Chemical Co 29
Chemtronics, Inc 74
Cleveland Institute of Electronics...71
Connecticut Mutual Life Ins. Co.
Delco Radio Div., GM
Electro-Voice, Inc.
Ford Motor Co
GC Electronics Co
Gem City Tuner Service
International Crystal Mfg. Co
IRC, Inc
Jerrold Electronics
Kay -Townes Antenna Co
Lakeside Industries
Lampkin Laboratories
Loral Distributor Products
Mallory Distributor Products
Michigan Magnetics
Mid -State Tuner Service
J.W. Miller Co
Quam-Nichols Co
Quietrole Co
35
59
66
27
26
24
22
60
33
73
74
72
25
20
74
63
73
60
72
Radio Corp. of America 4th Cover
RCA Institutes 32
RCA Semi -Conductor 36
RCA Test Equipment 30-31
Sencore, Inc. 61
Triplett Electrical Instrument Co. 34
Tuner Service Corp 19
Weller Service Corp. 69
Xcelite, Inc 65
Zenith Sales Corp. 23
SPOT
CHECK
A RED INDICATORAPPEARS ON THEFACE OF YOUR TAPEHEAD WHEN THEREARE ABOUT 100HOURS OF WEAR LEFT
ASK FORFREE BROCHURE SPOT CHECK
BROCHURE
MICHIGAN MAGNETICSA DIVISION OF VSI CORPORATION
VERMONTVILLE, MICHIGAN 49096Telephone (517) 259-8911
... for more details circle 120 on postcard
CRT Rebuilder
Rebuild your own CRT's. Averagecost B/W $1.50-Color $8.50. Easyto operate. Requires only 4x8 feet ofspace.Supplies for your first 50 picture tubesfree!Color - black and white. Rebuilt whileyou are here. See the results for yourself
Terms Available
Lakeside Industries - Div. Associated Ind.6338 N. Clark St.Chicago, III. 60640Phone: 312465-2881
Free demonstration appointmentSend me more information
Name
Address
City State
74 .. for more details circle 117 on postcard I
TELL ME MOREThis page is provided for your con-venience. To obtain additional in-formation on new products, tradeliterature and advertised productsin this issue, simply circle the cor-responding number on the perfo-rated card below, fill in your name,business address and mail the card.No postage is required.
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Use this convenient card ifyou wish to receive furtherinformation on products andservices advertised or de-scribed in this issue.
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ELECTRONICTECHNICIAN / DEALEROJIBWAY BUILDINGDULUTH, MINNESOTA 55802
FIRST CLASSPermit No. 665
DULUTH MINNESOTA
Tell me allabout yourself.What's your line?Do you deliver?How about service?Is there parking?What are your hours?I'm interested in everything
- about you when Ilook you up in the
YellowYellow Pages. Pages
Extra Mileage with RCA!Valuable tires, auto batteries, and shock absorbers from B. F.Goodrich are available to you in exchange for "Extra Mileagewith RCA" certificates. These certificates are FREE with yourpurchases of RCA entertainment receiving tubes from your par-ticipating RCA Tube Distributor at the rate of 1 certificate forevery 20 tubes purchased. (Optional with RCA Tube Distributors.)Certificate values include installation and all applicable taxes.
Silvertown HT770Nylon Cord Tubeless 4 plyExtra performance and greater mileagefor drivers who travel long distances atsustained high speeds. Black wall in size7.00/6.50-13 requires 18 certificates. Ad-ditional sizes in black and white wall upto 33 certificates.
Auto BatteriesGoodrich Pow -R -Cell auto batteries fromthe P53 at 15 certificates to the S27 at 21certificates. Delco Energizer auto batter-ies from the 557 at 16 certificates to -theY81 at 25 certificates.
B.FGoodrich
Silvertown 660Rayon Cord TubelessNew cars come equipped with these tires,which deliver above average mileage un-der most driving conditions. Black wall insize 6.50-13 requires 16 certificates. Ad-ditional sizes in black and white wall upto 31 certificates.
Shock AbsorbersB. F. Goodrich standard installed
15 CERTIFICATES
B. F. Goodrich Heavy Duty installed23 CERTIFICATES
B. F. Goodrich Levelift installed38 CERTIFICATES
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Silvertown Radial 990Rayon Cold TubelessAmerica's most advanced passenger tireoffers up to 15,000 miles longer treadwear, and up to 10% savings in fuel con-sumption. White wall only. Size 6.50-13requires 28 certificates. Additional sizesup to 45 certificates.
Also available are Silvertown Wide Pro-file tires, Trailmaker Silvertown NylonCord Snow Tires, and Silvertown ExtraMiler Nylon Cord Commercial Truck Tires.See your local participating RCA Distrib-utor today for complete details and getextra mileage with RCA!RCA Electronic Components, Harrison, N.J.