Paraphase amplifier (T389E)

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

Pulsing Tone Generator 4011 (CB10743E)
Although it is a common configuration today, these circuits were taken from an old publication. The...
Resistance Multiplier (CB19497E)
The idea of this circuit is to obtain a resistance of 10G ohms using an operational amplifier....
Capacitive discharge ignition (CB9522E)
Found in a 90s American documentation, this circuit is used in vehicles with contact breaker. The...