3-channel preamp (T484E)

This 4-tube circuit was found in an American publication from 1947. It is intended for audio distribution lines using a transformer source.

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Transmitter modulator (CB7492E)
This modulator circuit for AM transmitters was found in a 1960 Sylvania transistor manual. Modern...
Electronic Relay (CB504)
circuit is used to increase the sensivity of a relay. A 50 to 100 mA relay can be triggered with...
Logic Proof (CB21193E)
We find this circuit in an Electronics Now. The indication of the logic level is done on a...