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In Reply to: Yep.. posted by Lew on December 17, 2023 at 09:08:17:
I just tried two more KenRad 6SN7GT tubes; one is also microphonic but fortunately one is not. I left the good one in the MP-1 for now. So, between the 4 KenRad NOS 6SN7 tubes, half of them are microphonic. Very disappointing.
Maybe I had been lucky, I've used many NOS 6SN7 tubes. Everything from 5692, VT231, GT, GTB, GTA and these two are the first microphonic ones. They are so bad, the noise is clearly audible 6 feet away from the speaker when all I did was turning the volume knob or lightly tap the pre-amp chassis, not even tapping the tubes.
It makes me wonder if it's the tube socket?
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Follow Ups
- RE: Yep.. - MLin 13:49:07 12/17/23 (4)
- 5692 - Lew 20:02:32 12/18/23 (2)
- Sockets don't cause microphonics. - Ralph 10:32:02 12/18/23 (0)
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