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RE: RH84 type test amp: THD & THD+N @ 1 to 3 watts ...

Having the third harmonic dominate in a SE amp suggests some "distortion cancellation" is happening. you should check the distortion at the grid of the output tube at 3W out and see if it is the driver stage that is causing this.

If the distortion is vanishingly low at the driver then the other place to look is the output transformer and a SE output running too much current will start generating even harmonics as you hit saturation.

dave


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