Tube Power Source (CB6743E)

This circuit is from a high voltage tube source. It does not include the filament voltage that must be supplied by a separate transformer.

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Darlington Touch Switch (CB7191E)
This circuit is from 1968 General Electric documentation. It can certainly be adapted for any...
Capacitor Tester (CB4391E)
This tester from a 1960 magazine is only for capacitors with insulation voltages above 200 V (110...
Unijunction Telegraphy Oscillator (CB12283E)
Found in a 1991 publication this circuit can be assembled with more modern components. We can use...