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Marshall JMP 2203 Pair of valves redplatting when cranked.

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  • #31
    +1 on fixing the original fault.

    If you had a 4-cylinder car that was running lean and it had a single carb, would installing 4 carbs be a good way to fix it?

    Whenever you modify a circuit you have a chance of introducing a new fault, making a mistake or obfuscating the original fault, making further diagnosis even more difficult.

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    • #32
      Originally posted by Mick Bailey View Post
      If you had a 4-cylinder car that was running lean and it had a single carb, would installing 4 carbs be a good way to fix it?
      I'm experiencing analogy envy
      "Take two placebos, works twice as well." Enzo

      "Now get off my lawn with your silicooties and boom-chucka speakers and computers masquerading as amplifiers" Justin Thomas

      "If you're not interested in opinions and the experience of others, why even start a thread?
      You can't just expect consent." Helmholtz

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      • #33
        It isn't the analogy, Chuck, it is what you do with it...
        Education is what you're left with after you have forgotten what you have learned.

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        • #34
          Do what Enzo said. I recently went through my entire stock of 6L6 pulls in that way - one in the amp at a time. With no changes in the bias pot, current readings varied from IIRC 15ma to 55ma (I marked each one). With that info, I was able to make a bunch of good pairs. This sure will make it a lot easier to find what I need the next time I have one of a pair or quad crap out (and to figure out if my problem with an amp is the amp or the tubes).

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