Using transistors at the time, this circuit was found in a 1967 Ferranti documentation. The circuit is for 150-ohm transmission lines.
This circuit may be modulated by a very low frequency signal, for example to obtain the vibrato...
This circuit is from Motorola's Linear Databook from 1990. The integrated circuit and transistors are...
This circuit that uses only transistors that are still common was found in a 1995 documentation. The TIP41...