1952 RCA 21T176 - Early Television Foundation
1952 RCA 21T176 - Early Television Foundation
1952 RCA 21T176 - Early Television Foundation
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Hem<br />
V 1<br />
V 2<br />
V 3<br />
V A<br />
V 5<br />
V 6<br />
V 7<br />
V 8<br />
V9<br />
V 10<br />
VI 1<br />
V 12<br />
V 13<br />
V 14<br />
V15<br />
V 16<br />
V 17<br />
V 18<br />
V 1 9<br />
V20<br />
V21<br />
V22<br />
V23<br />
V24<br />
V25<br />
Tub.<br />
6BQ7<br />
8X8<br />
6AU6<br />
6CB6<br />
6CB6<br />
6CB6<br />
6AG7<br />
6CB6<br />
6AU6<br />
6AU6<br />
6AL5<br />
6AV6<br />
6AQ5<br />
6SN7GT<br />
6SN7GT<br />
6AQ5<br />
6SN7GT<br />
6SN7GT<br />
6CD6G<br />
6W4GT<br />
6W4GT<br />
1B3GT<br />
5U4G<br />
5U4G<br />
T2Kn<br />
on<br />
57KS2<br />
57Kn<br />
.3S2<br />
.sn<br />
on<br />
RESISTANCE MEASUREMENTS<br />
RESISTANCE READINGS<br />
Pin 1<br />
290KS2<br />
470Kn<br />
47KH<br />
7.8KB<br />
lOMee<br />
• 470KS2<br />
f26Kn<br />
,5Meg<br />
i.SMeg<br />
3.9Meg<br />
l.SMeg<br />
Inf.<br />
M.<br />
nf.<br />
Pin 2<br />
8.2Meg<br />
lOOKn<br />
On<br />
sen<br />
esn<br />
won<br />
on<br />
ts.sxn<br />
on<br />
on<br />
8Kn<br />
on<br />
>43on<br />
ti.2Kn<br />
tl.SMeg<br />
i.3Kn<br />
tS.BKn<br />
tsoKn<br />
.in<br />
Inf.<br />
200Kn<br />
Pin 3<br />
8.8Meg<br />
ji3Kn<br />
on<br />
on<br />
.in<br />
.in<br />
on<br />
uon<br />
on<br />
on<br />
.in<br />
on<br />
on<br />
isoKn<br />
on<br />
on<br />
820n<br />
218Kn<br />
won<br />
200Kn<br />
200Kn<br />
on<br />
.in<br />
.in<br />
.in<br />
on<br />
on<br />
Pin 4<br />
3.9Kn<br />
i.2n<br />
.m<br />
.in<br />
on<br />
.in<br />
.in<br />
t!75Kn<br />
tl.SMeg<br />
.in<br />
IMeg<br />
218Kn<br />
Inf.<br />
Tnf<br />
Inf.<br />
PINS 1 THHOUGH 8 HAVE INF RESISTANCE<br />
nl.<br />
Inf.<br />
ion<br />
iiKn<br />
iiKn<br />
PIN 2<br />
200Kn<br />
Inf.<br />
Inf.<br />
PIN 10<br />
#270Kn<br />
2LAP4<br />
ALL MEASUREMENTS TAKEN IN TV POSITION<br />
ALL CONTROLS SET FOR NORMAL OPERATION<br />
t MEASURED FROM PIN 8 OF V23 81 V24<br />
• MEASURED FROM 130VDC LINE<br />
• MEASURED FROM PIN 8 OF V21<br />
1 MEASURED FROM 135VDC LINE<br />
• MEASURED FROM PIN 3 OF V20 & V21<br />
nn<br />
nn<br />
PIN 11<br />
i20Kn<br />
.in<br />
Pin 5<br />
.2n<br />
tUKn<br />
t2.3Kn<br />
t5Kn<br />
ts.iKn<br />
43n<br />
160Kn<br />
SlKQ<br />
•iKn<br />
Inf.<br />
170Kn<br />
taaon<br />
t680Kn<br />
t250Kn<br />
ti.2Kn<br />
tisKn<br />
T56Kn<br />
IMeg<br />
t24on<br />
t240n<br />
Inf.<br />
Inf.<br />
PIN 12<br />
u.2n<br />
Pin 6<br />
8.7Meg<br />
on<br />
134Kn<br />
t34Kn<br />
flSKSJ<br />
tiiKn<br />
tiiKn<br />
ti. 3Kn<br />
.2Kn<br />
>24Kn<br />
on<br />
170Kn<br />
tsion<br />
400Kn<br />
on<br />
tl.2K!2<br />
on<br />
on<br />
won<br />
Inf.<br />
Inf. .<br />
ien<br />
Ififl<br />
Pin 7<br />
170Kn<br />
100KS2<br />
won<br />
on<br />
on<br />
on<br />
.in<br />
t3.8Kn<br />
82n<br />
esn<br />
Inf.<br />
t330K.O<br />
.470KH<br />
ion<br />
on<br />
3.3Meg<br />
on<br />
on<br />
on<br />
«.m<br />
•.in<br />
Inf<br />
Inf.<br />
Pin 8<br />
ison<br />
t2.9Kn<br />
t8Kn<br />
i.2n<br />
.in<br />
.in<br />
.in<br />
ti2Kn<br />
•on<br />
•on<br />
iiKn<br />
iiKn<br />
on<br />
Pin 9<br />
t2.9K!2<br />
TOP CAP<br />
«2n<br />
TOP CAP<br />
*soon<br />
DISASSEMBLY INSTRUCTIONS<br />
1. Remove 8 push on type control knobs.<br />
2. Remove 3 wood screws from back cover. Remove cover.<br />
3. Disconnect built-in antenna.<br />
4. Disconnect speaker.<br />
5. Remove clip on jewel light.<br />
6. Disconnect H. V. lead. l<br />
7. Disconnect picture tube socket.<br />
8. Disconnect yoke plug from H. V. unit.<br />
9. Remove 6 chassis bolts. Remove chassis.<br />
10. Remove speaker mounting nuts. Remove speaker.<br />
Note: For picture tube removal, it is necessary to remove the chassis as outlined above.<br />
OSCILLATOR ALIGNMENT POINTS<br />
PAGE 8
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