Anybody match/test tubes in the Chicago area

Discussion in 'Amps and Cabs' started by brucesinger, Feb 22, 2012.

  1. brucesinger

    brucesinger Member

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    I've got a quartet of 6L6s that got mixed up, so I don't know what the pairs are.
    Anybody in the Chicago area capable of "re-matching" tubes?
     
  2. Blue Strat

    Blue Strat Member

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    Got a bias probe? You can use that. If you don't you probably should have one anyway. ;)
     
  3. xntrick

    xntrick Member

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    i'm curious how to do such a thing, could you explain further?
     
  4. Blue Strat

    Blue Strat Member

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    Insert bias probes into amp's tube sockets, insert tubes to match into bias probes, measure idle current of tubes, group the tubes with the closest idle current readings.
     
  5. mike shaw

    mike shaw Member

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    Makes sure you don't adjust your bias pot (negative bias voltage) while testing.
     
  6. capnjim

    capnjim Senior Member

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    Considering most caps and resistors have a 5-15% tolerance, the whole idea of matching tubes is a huge farce. Stick 'em in, and let her rip!!
    But, then again, I have only been doing this for 25 years. I probably have over 100 6L6's and I mix them up any way I want and just use my ears.
     

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