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RE: Why is Square / Rectangular Wave Deal of the Day?

The technique I'm using applies ultrasonic AC to the filament in a manner that is both differential and balanced WRT ground. It does not affect bias. The circuit below is a simplified version. I've only used this with DHT output stages, so I apply bias to the grid. Bias could alternately be applied to the cathode, for instance by inserting a resistor or parallel resistor/cap combination in series with the wiper of the hum pot. The ultrasonic heater supply does not cause bias to vary in any case.












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