Power stage (T409E)

This tube is similar to the 6V6 and 6AQ5. We found the circuit of approximately 1 W in modern documentation on experiments with tubes.

Complementary Transistor Oscillator (CB495)
Audio signals can be produced by this circuit. Frequency range is determined by C1 and adjusted by...
10 to 84 MHz Colpitts oscillator (CB4052E)
This Colpitts crystal oscillator was found in an American publication for amateurs in the 1980s....
Negative Resistance Circuit (CB926E)
This configuration presents a negative resistance caracteristic such as the one found in...