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.

15 W PT 2B Commercial Amplifier (CB18435E)
This power amplifier circuit was marketed in Japan in the 1960s. The transistors are made of...
Pulse Generator 555 (CB15102E)
When excited by a pulse of variable width at the input, this circuit produces a pulse of constant...
Tunnel Diode Multivibrator (CB1339E)
The frequency of this circuit, that makes use of a tunnel diode as an active element, depends on...