This class B circuit was found in the 1960 Mullard transistor reference manual. Transformers are the critical components. The source is not symmetric.
Found in Motorola documentation from the 90s, this circuit makes use of a triac from that time. The...
This transistorized signal injector was one of the first that we found using the well-known...
This 200-mW amplifier uses one of the first commercial power transistors. The circuit is from a...