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  1. cupcupcup

    Mark IIB tubes

    I accidentally threw out the power tubes for my Mark IIB when it was shipped to me. It had 2 6L6 Groove Tubes in it before...can i just plug some Mesa tubes in there (because it's fixed bias?) or do i need to get it rebiased?
  2. cupcupcup

    Mark IIB knobs

    Hi, I recently purchased a Mark IIB combo, serial number 10335. From what I have read, all Mark IIB amps had black knobs with silver tops, but mine are solid black like you see on the IICs. The presence knob on the back, however, is silver topped. I do not think the front knobs have been...
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