Paraphase amplifier (T389E)

This 6C5 tube circuit was found in a modern tube design manual. The circuit applies to other equivalent triodes.

DC Motor Control (CB15610E)
DC motors of 6 to 12 volts and currents of up to 2 amps can be controlled with this circuit. The...
Wiretapping Amplifier (CB19339E)
This is an amplifier that uses a pickup coil placed next to the telephone set and the listening is done in...
Function Generator (CB14859E)
This circuit was found in a French documentation from the 80's. The circuit must be powered by a...