Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

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RE: Listen for yourself

Posted by Donald North on July 7, 2017 at 11:35:35:
You say again "one of the most striking distinguishing features of an SET amplifier is the relatively large percentage of second-order harmonic distortion." As I previously said, 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%. Another differentiating factor which you have not mentioned is the fact that they do not split or mirror the phase as do differential and push-pull amplifiers do. I believe this is a contributing factor to the SET sound.

An example: Back in the 90s Audio Note UK made two tube amplifiers that were as identical as possible, one a parallel single ended, the other a push-pull. The reviews all said the single ended version sounded better.