35 W Amplifier (T359E)

This class AB2 amplifier was obtained in a 1937 RCA tube manual. The circuit includes the dual high voltage power supply.

Tunnel Diode Oscillator (CB22576E)
Shown in Radio Electronics June 1953, this circuit needs a small adjustable source of 0 to 3 V and...
Oscilloscope Calibrator (CB3952E)
This circuit is suitable for the calibration of old analog oscilloscopes. It was found in...
Telephone amplifier (CB9400E)
This circuit was found I a 1965 Radio Schack documentation. The transistors are from that time,...