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RE: I'll have to dig it up. I've read several articles on this topic

I'd like pointers to the articles.

It is interesting that Nelson wrote the linked info back in 2013 and since then I hear he has been playing with the phase of the harmonics in successive stages so any 2nd generated remained in phase rather than nulled. Take a simple driver and output with a typical H2 dominant distortion spectra and the nature of the phase inversion puts the even order harmonics from each stage out of phase from the other creating a new overall spectra where the evens partially null leaving the odds to possibly dominate. The story goes Nelson would inset a 1:1 inverting transformer between the stages to keep the evens summing in phase so 2nd dominates and each following order declines.

The above is a rough paraphrase from my fuzzy memory... if anyone knows nelson's current thoughts please chime in.

dave




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