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12BH7 Pain to find good ones!

Discussion in 'Amps and Cabs [BG]' started by sedan_dad, Mar 31, 2009.

  1. sedan_dad

    sedan_dad Supporting Member

    Feb 5, 2006
    I'm haveing a heck of a time finding some good ones. I just got a pair off the bay. NOS Westinghouse . They check fine on the tube checker but in the amp I get distortion WAY too early. You can't even see the speakers move. Where a GOOD dependable TRUTHFUL source?
  2. johnk_10

    johnk_10 vintage bass nut Supporting Member Commercial User

    Feb 16, 2008
    Thousand Oaks, CA
    John K Custom Basses
  3. Rick Auricchio

    Rick Auricchio Registered Bass Offender

    A tube checker won't give the fine details of audio quality of the tube. It will measure transconductance (gain), but little else.
  4. sedan_dad

    sedan_dad Supporting Member

    Feb 5, 2006
    Spoken like a true idiot, I posted BEFORE I spoke with my repairman.
    After I threw the new 12bh7's in there I DIDN'T but NEEDED to re-bias the head.
    I'm suppose to be looking for .073 volts at the test points and I was way low. What a difference a little tweek can do.

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