• 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.

Cancelling Harmonics

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regarding the 'anti-tube' Wavebourn mentioned - of course there is the option to put a tube in the feedback loop of a tube, like the 'supertriode' conenction. Based on the fact that a function placed in the feedback loop becomes it's reciprocal at the output. In the real world, one is still et with the considerable problem of finding two triodes that fit well together in this approach...
 
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