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Nice comparison, thanks. One comment...

You observed:

"While CDs were playing, a co-worker kept tapping his fingers on the Minimax CD's chassis. At least with the tubes we were using, there were no probelms with microphonics."

All tubes suffer from microphonics at some level, and you may not be able to detect severe thumps and bumps with tubes that are still degrading the resolution through their internal acoustic responses and resonances.

Try this when you have access to a tubed unit again. Wrap the tube envelope tightly with Teflon thread-seal tape at the place where an internal mica spacer is touching the glass. Also wrap the tube pins with Teflon tape rolled up into a string, one at a time, at the places where the pins come out of the glass or base. You should hear greater resolution. Whether you like the remaining tonal character is a matter of taste.

Warning to the enthusiastic: do not cover too much of the glass with Teflon tape, or the tube will overheat. A single belt of tape with about five turns should be sufficient.


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