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12bz7 preamp sub for 12ax7?
Posted: Wed Nov 09, 2005 10:59 pm
by 79 Transam
I just came upon a couple 12bz7 nos from tung-sol.
Has any one used these in a Marshall?
I have read that they can be substituted for 12ax7s
Posted: Fri Nov 11, 2005 6:34 pm
by dynaman
I tried them in a Marshall before. They stunk. They made a bad humming noise. I tried multiple 12bz7's and they did the same. The amp would play but the noise was unbearable. I tried them because I saw them being advertised as a hot rod high gain replacement for the 12ax7.
Go ahead and try them, I'm curious to see if anyone else has the same problem.