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Carvin Legacy (105 hz hum?)

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  • #1

    Carvin Legacy (105 hz hum?)

    It's got a pronounced 105 cycle hum ten minutes after warm up.

    Yes, I've used freeze spray. Nothing.

    Amp is biased correctly. All voltages look good.

    Yes, I've traced it w/a signal. The hum seems to be all over the place.

    105 hz?
    Tags: None
  • #2
    Are you on 50hz or 60hz power? How are you measuring the hum frequency?
    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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    • #3
      60 cycle.

      Frequency counter, audio sig gen, e.t.c.

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      • #4
        Reverb feedback? Turn reverb off and see?
        Education is what you're left with after you have forgotten what you have learned.

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        • #5
          Reverb turned down.

          Pan not connected. Both sides.

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          • #6
            maybe it's an oscillation due to a bad silicootie? 105Hz pretty much takes filament, mains and PS rail noise out of the equation.
            "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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