Role of 12AX7 in Script logos

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Author Message   Giordano da Silva (macg1) Username: macg1 Registered: 06-2009 Posted on Wednesday, July 22, 2009 - 03:58 pm:    So, form my reading here I read what the physical definition of a PI tube is. However what i do not understand is this: my 1976 112 Sixty-five has two power tubes and the 12AX7 PI, it is a master volume amp; in other tube amps with master volume controls, the channel volume increases preamp gain while the master controls the power tubes. Is that true for my amp as well?   Lars Verholt (lmv) Username: lmv Registered: 11-2009 Posted on Thursday, September 30, 2010 - 10:31 pm:    Yes. -Lars Verholt