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.
We found this circuit in a 1977 publication. With it we can test general purpose operational...
Lamps in the range between 20 and 50 mA can be used. Voltage supply is according the lamp and...
This 100 kHz crystal controlled oscillator was found in an American 1980s documentation. The...