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Kustom 150 run hot?

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  • #16
    Maybe the oscillation is causing the warm outputs?
    Originally posted by Enzo
    I have a sign in my shop that says, "Never think up reasons not to check something."


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    • #17
      Okay, got everything looking good!

      First of all, I have no idea where that 5MHz signal was coming from, it wasn't there at work and it's not there now at home.
      There always was a little high frequency fuzz on the top half of the sine wave that would go away when cranked.
      It was caused by the T039 I used for Q6, a brand new transistor. I replaced it and it's gone.
      I don't think it was enough oscillation to cause the amp to run warm.

      Across the bias diode string from CR1 to CR3 there is ~ 1.9v. If I jumper across CR1 & CR2 and leave only .6v bias there is no crossover distortion and it should run cooler.
      Think I should leave those diodes out of the circuit?

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      • #18
        The question is DOES it run cooler. We know it should. COmpromise. What does it do with just one diode out? Or replace both those with a single new diode.
        Education is what you're left with after you have forgotten what you have learned.

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