Is there a substitute for the 12au7 tube, like there is for the 12ax7, that has better sonics and microphonics? Of the many brands available, which are considered the most transparent, and pure sounding, compared to colored or lush, one note bass, etc.
The European equiv.s are ECC82, ECC802s, CV4003. Go to Joe's Tube Lore at AudioAsylum for a detailed evaluation of 12AU7s. In my system, I liked Amperex Holland Heerlen labelled Dumonts best.
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