The Transcendent grounded grid preamp uses 12au7's (gain of 20) at all stages, one of the lowest gain tubes in the 12??7 range.
You could change the input tube first for a 12at7 ( gain of 60)and see how you go. These 12at7's are interchangable with the 12au7 as are 12ay7's (gain of 40).
Cheers George
You could change the input tube first for a 12at7 ( gain of 60)and see how you go. These 12at7's are interchangable with the 12au7 as are 12ay7's (gain of 40).
Cheers George