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Re: That's what I was thinking....

It's likewise possible to nearly null out H3 in a pentode. You can do this by making Rp small. H2 can be entirely nulled by making i+ and i-symmetrical.

Before you end this experiment, why not see what happens as feedback
--> infinity? What I predict you'll find is that high-order products first *increase* (with small feedback) then *decrease* (as feedback is increased). This assumes that feedback is not bandlimited (as in conventional amplifiers). IOW, high-order harmonics --> infinitessimal as feedback --> infinity. Does Spice now tell you that feedback can reduce its own harmonic multiplication? Just be sure that your 1kHz feedback factor does not roll-off at high f's.


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