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Original Message
RE: 12av7 tubes
Posted by Jim McShane on February 24, 2017 at 15:26:46:
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.