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Marshall AVT150H Master Volume and OD1 not working

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  • Marshall AVT150H Master Volume and OD1 not working

    Hello all!

    After many google searches, I have ended up here. I'm hoping you all can point me in the right direction to solving this problem.

    My Marshall AVT150H's master volume pot and OD1 channel have stopped working.

    I am able to adjust the volume on these channels individually, but they max out around what I am guessing would be 4 on master volume. Rotating master volume has no affect on any channels volume.

    Acoustic, clean, and OD2 all seem to be working just fine (except no master control). None of these channels hum or sound crackly. When I go to OD1 I get nothing at all.

    If anybody has any suggestions, it would be greatly appreciated as I have no idea what is wrong.

    Thanks in advance!

  • #2
    First guess is a bad op amp, specifically one that is connected to any muting contacts on the input jack.
    Education is what you're left with after you have forgotten what you have learned.

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