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In Reply to: Re: Tubes - Sylvania 12ax7 vs 5751 3 mica blackplates posted by tvr2500m on October 6, 2004 at 18:56:29:
SJ,Thanks for the info. It seems that the concensus is that a 12ax7 cannot be a mislabelled 5751. I paid $155US for a "matched" pair of advertised Sylvania triple mica blackplate 5751's and received 2 tubes that are clearly labelled 12AX7's with no other labelling (even the original boxes said 12ax7); they are triple mica blackplates. The source claims these are 5751's because of their gain and that Sylvania never made a 12AX7 that was a triple mica. My question is, "How can they have the same gain as a 5751?" I can't confirm this as I have no way of checking.
So being that this 12ax7 is a triple mica blackplate, and supposedly has the same gain as the 5751's, do you think that it would "sound" the same?
Is their some visual aid to identify the tubes by looking at its construction? ie. the plates, etc.
Finally, what is the street value of a "matched" pair of Sylvania 12ax7's with triple mica blackplates?
4kids
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- Tubes - Sylvania 12ax7 vs 5751 3 mica blackplates - 4kids 20:25:55 10/06/04 (0)