Tube rolling a Demeter VTBP-M-800D

Discussion in 'Amps and Cabs [BG]' started by Coolhandjjl, Jan 11, 2015.

  1. Coolhandjjl

    Coolhandjjl Supporting Member

    Oct 13, 2010
    Like the title reads, any one opened 'er up yet and tried some out?

    Stock, mine has an EH 12AX7 in the left, a JJ ECC81 (12AT7) in the right slot. I do know that ECC81s are 60mU.

    I have some NOS tubes, a GE black-plate 5751, those are 80mU; and some Mullard Blackburn long-plates ECC83s, 100mU.

    I wonder if I will fry anything putting a higher gain tube in the right slot?
    Last edited: Jan 11, 2015
  2. B-string

    B-string Supporting Member

    You won't "fry" anything. Keep in mind the 12AT7 is a higher current device than the 12AX7xxx. If the 12AT7 is in a buffer (output) circuit a sub for the higher current lower gain 12AU7 would be the choice.
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