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GK 400RB III no bias voltage

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  • #1

    GK 400RB III no bias voltage

    This amp came in w/ blown output transistors. I replaced all of 'em, driver transistors and ballast resistors included. Fuse doesn't blow anymore but I have no bias voltage. I'm thinking that Q18 bay be bad. Would a shorted Q18 cause 0v bias?
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  • #2
    Yes, but more likely Q8 (or both), because if Q18 is SC, than at least 0,6 volts should be there.

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    • #3
      Me too. CHeck both those transistors, and check the boas pot for open condition as well.
      Education is what you're left with after you have forgotten what you have learned.

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