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RE: Listen for yourself

"I have made SET phono stages and headphone amplifiers which have very low measured distortion in their normal operating range yet they still sound different and I believe superior. I don't believe this is attributable to 2nd harmonic distortion when the THD is less than 0.1%"

I think simple SE amplifiers made with direct heated triode output tubes that do not use feedback are notable by what is lacking in the HD. Namely, upper order HD.

I believe it's not the (relatively) high amounts of 2nd HD that make them "sound so good", it's the lack of 5th, 7th and 9th.

I believe (but can not prove) that the smallest amount (maybe even an amount that can't be measured) of 7th and it's game over. The electronics sound like electronics instead of music.

I could be proven wrong on all counts but this is what I believe and it is what guides me when designing circuits and picking operating points.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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