Found in a 1967 General Electric documentation this circuit uses unijunction transistors that may be equivalent to those indicated. The number of stages can be modified.
Found in a 1967 US magazine this circuit generates positive and negative voltage pulses from a...
This audio mixer was found in an old American documentation. The potentiometers are 1M and the...
In this circuit of a 1968 publication the unijunction may be 2N2646 and the transistor BC548. The...