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 old radio with a germanium transistor was obtained from an English documentation from the...
Found in an old American publication, this article is suitable for incandescent lamps. SCRs can be of...
We found this circuit in 1967 General Electric documentation. SCRs can be replaced by current...