Western electric 70 a schematic

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western electric 70 a schematic

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Page 1

Wmtlemic Company
No.70-A AMPLIFIER

Ma 252A m 205:
VACUUM TUBE VACUUM Tunis
VI


z I I 2
1
LI L2 {1 5'
L I.
T- T-
JZ 13
12 IO L33 no w 0 so
mo Io +350
vous vans lsvous

Fig. 1-Schematz'c Diagram of No. 70A Amplifier

TERMINAL NUMBERS AND CONNECTIONS FOR NO. 70A AMPLIFIER

Terminal Numbers External Connection
1 and 3 10 volts AC
2 Not used
4 and 6 4.5 volts AC
5 Not used
7 and 8 Output
9 Center Lap of 4.5»volt-AC source
10 and 11 Input
J Negative-350 volts DC,
12 Center tsp of 10»volt-AC source; and
l Ground
13 Positive, 350 volts DC

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