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.

1 to 15 MHz Crystal Oscillator (CB882E)
Frequency in this oscillator is controlled by a crystal. Any 1 MHz to 15 MHz can be used. The JFET can...
Universal AC Motor Control (CB855E)
This control is intended for 110 VAC or 220 VAC Motors. Any TIC series triac can be used according the power...
Simple infrared transmitter (CB7024E)
A Popular Electronics from the 90's suggests this circuit that is based on a low voltage...