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.
Maxim MAX20056B 6 Channel High Brightness LED Controller Maxim Integrated makes available through...
We found this circuit in American documentation from the 1980s. Transistors can be of general use....
This circuit for car engine spot adjustment was found in an 80's Radio Electronics. The circuit...