Playback Amplifier (14W)

This 7-tube circuit was obtained from an American publication in 1947. The circuit has a push-pull output with a source using a transformer.

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20 MHz Oscillator (CB8135E)
Found in a 1967 EEE, this circuit oscillates at 20 MHz according to the values of the given...
Audio Stage with Bootstrap (CB12203E)
In the figure we have an amplifier step configuration with a transistor suggested by a 1985...
5 mA Constant Current Source (CB25615E)
This constant current circuit was found in the October 1993 Electronics Now magazine. The current can...