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 is a shunt circuit to be used on a multimeter, expanding its scales to measure high currents....
This step is also suitable for the AC188k and SK3004 transistors and was found in a 1980s...
This high quality audio preamplifier uses three bipolar transistor and is powered from 24 V...