Voltage amplifier with the 37 tube (T392E)

Found in a modern design book with tubes, this stage with the triode 37 has a plate current of 3.7 mA.

2-transistor LC oscillator (CB22388E)
This circuit was found in English documentation from the 90's. Transistors are general purpose types....
Precision Rectifier (CB24972E)
This instrumentation circuit is from the June 1986 issue of Radio Electronics magazine. Equivalent...
Audio Remote Control (CB24138E)
This is an interesting idea that we found in the May 1971 issue of Radio Electronics magazine. It can...