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120hz

  1. Fasturd

    Pair of Dynaco Mark IV buzz. SOLVED

    New to the Dynaco world. My new to me Mark IV amps have an identical buzz that is too loud to ignore. They were partially updated prior to my ownership and did not buzz at the sellers home. I do not know the make of the boards yet but they are currently running 1 Sylvania 6GH8A on each board...
    • Fasturd
    • Thread
    • 120hz 60hz 6gh8 buzz dynaco mark iv problem solved
    • Replies: 69
    • Forum: Tube Audio
  2. J A

    SX-580 120hz hum

    I've been digging around the forums and I think this is power supply related based on what I'm seeing. I have a 120hz hum (spectrum analyzer confirmed) from both speakers. It is not influenced in any way by volume, input changes, or switching channels. The only time it stops is disengaging...
  3. crkeith65

    QRX-5500 120hz hum caused by my mistake

    While troubleshooting a dial lamp short that was blowing F1 fuse, I had a wire disconnected from the light box that has 6.3vac. (Lamp Power). When I was moving the light box around to get a better look, the loose wire accidentally contacted a wire on the 330ohm resistor that had 58vdc. See my...
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