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.
I think the inductors make the difference.

When I was young and did my basic EE training, we had two old men in our company (more than 3000 employees) who were experts in this field and they did nothing but wind mains & signal transformers and chokes. They had a hell of respect for the "Wickelgüter" in the V76 and related units even though they had the best machines and materials for the job.

Other experts, such as Gerhard Haas, also considered these inductors to be not fully reproducible at a justifiable economic cost.

It's not that simple, even if some would like it to be...
 
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