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In Reply to: RE: If you are experiencing micro phonics with the 12au7(s) used in... posted by JoshT on July 2, 2017 at 12:49:23:
As you have 4 of the LP's and assuming that only 2 of them are used for gain you could try the noisy tube in a non gain position (which would get you up and rolling right away assuming the other 3 are much less noisy).Ask your dealer about which positions/sockets do what within the preamp and then swap the tubes accordingly.
If this works then you have plenty of time to research backup tubes.
Edits: 07/02/17
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Follow Ups
- And... a PS to my post below... - DeKay 17:14:54 07/02/17 (1)
- Yeah, it was as you said, a bad tube in the gain stage - JoshT 22:04:05 07/02/17 (0)