This NEC commercial amplifier was manufactured in Japan in the 1960s. The circuit uses 4 transistors from the time and was powered by a 9 V battery voltage formed by large batteries.
Two potentiometers mounted at right angles, so that they can be operated by a lever, form a very...
The integrated circuit and configuration are uncommon. However, the sound quality is good. The...
Found in General Electric's 1969 documentation, this circuit uses two Foto Darlingtons to control...