WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.

1948 Wireless World - 50 Watt Amp

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Never mind the year of publication or power rating, but a simple, clever, practical circuit none the less.

Push-pull KT44 triode amplifier - self-aware

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