Suggested by General Electric in a 1968 documentation this integrated amplifier uses a component of the era, the PA237. The circuit runs on 24 V and excites a 16-ohm speaker.
This two-transistor amplifier has good gain but delivers a fraction of a watt of power. The...
This circuit was found in the 1969 RCA thyristor manual. The circuit has a limiter (clipping) with two 12...
This small amplifier, with output less than 1 W, was found in a 1960 transistor manual from...