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In Reply to: RE: 12av7 tubes posted by firstname.lastname@example.org on February 24, 2017 at 14:24:34
Just be sure they are checked for microphonics! I'm trying to dig up some right now for a customer - and I've had 60+ out of 100 NOS GEs turn up microphonic. I wouldn't have believed it if it didn't happen to me!
BE SURE you get tubes tested for microphonics regardless of which brand.
I wonder if some tube circuits aren't just microphonic by design. Not intentionally of course just the nature of the beast!
would some type of dampening make those usable?
Good thought - but no, these are BAD! And the reason I say 60 or so are bad is I haven't tested the rest yet. I fully expect that all will be microphonic. None are even close to usable.
I got taken on this batch!
Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."
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