This circuit was obtained from Elektor magazine and published in the Encyclopedia of Electronic Circuits Vol 5 of 1995. Transistors are RF types that are still common today.
This low-power circuit for small lamps according to transistors was found in the January 1959...
This dimmer for the 120 V (117 V) network was found in the magazine Electronics Now of August...
This old amplifier uses germanium transistors from the time. The circuit is from a Mullard...