This 1950s audio amplifier uses output tubes of type 1625 in its output stage. The Class B circuit provides a few watts of power and uses transformers that are not readily available today.
The frequency of this oscillator can be set in a range from 5000 to 1. We found it in an old...
This filter was found in Radio Electronics, and its configuration can be applied to any...
The keyboard for this organ is made by small metal plates where the probe touches when in...