Microphone 8 W amplifier (T369E)

This circuit was found in the 1961 RCA tube manual. The 4-tube circuit is suitable for microphones and record players with high impedance input.

Regenerative receiver (CB20513E)
We found this receiver in old documentation. The transistor is made of germanium and the...
Differential Phase Inverter (CB967E)
This circuit was found in and old documentation of 1958 and uses complementary germanium...
Transistor AM Radio (CB1389E)
The coil of this receiver consists of 100 turns of wire 38 to 30 in a ferrite rod and the...