Preamp difference : if it's not the frequency, not the slew rate, and not the harmonics, what is it ?

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I built a V76 with transformers from Ollie and NOS EF 804's, exact same circuit,

A friend bright over a real one and boy was I disappointed , they did not sound the same at all. His was better. What was the difference? I have no idea.
You could try swapping his tubes for yours see if that changes anything
 

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