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When I crank up the verb to above 4 I begin to get some real buzz (I might simply call it trash). I have taken the (2) existing 12AT7's and swapped places and I think it has gotton a little better buit don't have a db meter to confirm, which really means it has not gotton a lot better. Recently acquired the Amp and the pre-amp tubes say "fender" so I assume they are original. S/N indicates the amp is a 1992 model. Could the 12AT7's be the cause of the noise??? Should I go ahead and replace these 2 tubes or should I replace the entire pre-amp tube bank 12AX7's as well. The power tubes seem fine on both channels.
Thanks,
Thanks,