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 solid-state relay circuit that can function as a shield in a Radio Electronics...
We found this filter in a documentation for radio amateurs from 1974. The transistors could be the...
The power supply for this circuit, which we found in a publication from the 1980s, must be...