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In Reply to: RE: 6SL7 posted by Laudanum on April 12, 2017 at 05:14:23
"in general, is there a better chance that the short plate 6SL7's wont be microphonic?"
Yes, in general the smaller the plate area the less likely the tube will be microphonic.
Of the "normal" type 6sl7 "round" plate tubes, I find the short bottle GE 6sl7 to be the least microphonic.
You might look for the 6188, shown above, with ladder type box plates kind of like a 12ax7.
Those should be even less microphonic.
There is also a 6sl7 with real short black plates. See link.
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Almost as much as 5691 which also should be non microphonic. The 5691 tube was built for rockets so it could withstand something like 200Gs.
I thought the 5691 and 5692 were built mainly by RCA as a long lived tube but did not have the incredible internals of a Bendix with their ceramic spacers eg and Nonex glass etc.
Actually 5691 and 92 were made mostly by GE for RCA. I guess they had the excess jigs to make them. And not made to the standard of the Bendix tubes, but way above the needs for an ordinary 6sl7 with 10,000 hour lifespan if recommended specs were followed.
Yes, a Sylvania with the plate type in your link (the one on the right) is the type I purchased as a test. Don't have it yet to try.
Also interesting that the structure of the CBS Hytron that I have that is not microphonic is very much like the 6188 that you pictured. Of course, that could just be luck.
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