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.
This circuit has visual and audible status indication using an oscillator. The circuit is from a...
This circuit was found in the Linear Applications Handbook of the National Semiconductor of 1994....
The figure shows how to use a 3-winding transformer to switch outputs with different voltages by...