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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Converter Stage of a Transistor Radio (CB937E)
This is a converter stage found in old transistor superheterodyne radios. The circuit is for...
Pulse stretcher (CB9244E)
Found in a 1967 American documentation, this circuit increases the duration of a pulse applied to its...
3W and 5W amplifier (CB9904E)
This amplifier, which can supply 3 or 5 W of power, according to the values of some components given in...