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.
I found this circuit in an ond publication from 1958. The transistors are germanium types but the...
The AC125 transistor is an ancient germanium type widely used in audio stages as a preamplifier. In the...
Found in a 90s R-E Experimenter Handbook, this amplifier uses an integrated circuit from that...