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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Four Channel Mixer (Cb13613E)
We found this circuit in a 1974 integrated circuit manual. Operational amplifiers can be of...
Parallel crystal oscillator (CB9652E)
We found this circuit in American documentation from the 1980s. Transistors can be of general use....
Field strength meter (CB7561E)
This sophisticated remote field strength meter circuit was found in a 73 magazine for radio...