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That is fascinating!

So if I'm understanding you correctly, it sounded bad without any degeneration. But then you only added a little bit of degeneration to one of the two tubes to get the sound you wanted. Very interesting indeed, but difficult to draw any conclusions.

You also noted that the amp is sensitive to the components used. I have found this to be true in our zero-feedback designs as well. My hypothesis is that just as the presence of feedback dominates the measured results, it also dominates the sonic results.

In other words, you can take a mediocre circuit, add a bunch of feedback and it will measure pretty well. The feedback is the dominant factor in the measurements. In the same way, adding feedback will give a strong "feedback sonic signature that dominates the overall sonics. Remove the feedback, and the signature goes away. The amp is now much more neutral and transparent, allowing component changes to be heard much more clearly.

Best regards,
Charles Hansen

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