With only 1% distortion, this Motorola amplifier found in a 1968 documentation makes use of period components. The frequency response ranges from 10 Hz to 100 kHz.
Circuits of the same type can be found in this section from various publications. This one is from...
This circuit was found in a 1964 Electronic Design. The circuit makes use of transistors of the...
This telegraphy broadcast monitor delivers a signal to a speaker from a unijunction transistor...