What would cause an amp to cut out at volume?

Discussion in 'Amps and Cabs' started by Random Hero, Feb 23, 2012.

  1. Random Hero

    Random Hero Member

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    I went to try out a Marshall JVM yesterday. All was fine until you got the masters up to about halfway. At that point, every time you hit the strings, the amp cut off for a second or two before coming back on. Very weird.

    Any clues?
     
  2. Blue Strat

    Blue Strat Member

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    Could be any of 50 things. If you're considering buying the amp have the seller fix it first.
     
  3. picknpluck

    picknpluck Member

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    Any chance it was an issue with the guitar or the cord, like a short?
     
  4. solitaire

    solitaire Senior Member

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    Sounds like a valve issue of some sort. Probably the outputs.
     
  5. ken374

    ken374 Member

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    thought that amp kinda sounded like crap at high volume, few other people said that also
     
  6. vain_guitarist

    vain_guitarist Member

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    Momentary silence at loud volumes suggest that there's a vibration issue somewhere and as the note dies down a bit, the vibration subsides enough for the issue goes away.

    Cables and jacks are a place to start and don't forget the speaker cab jack as well as speaker cable. This is where I think you'll find the problem (if it is not tube related). Make sure there's none of those Switchcraft cable extender adapters (dual female) in line with the speaker cable. I've seen this problem when someone had two 3' speaker cables connected together to make a single 6' cable with one of those adapters. Vibration caused it to loose connection momentarily.
     
  7. Random Hero

    Random Hero Member

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    I don't think it was a vibration thing as the lights of the amp went off and back on again in the second or two the process took. It wasn't the lead or guitar.
     
  8. Blue Strat

    Blue Strat Member

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    Power cord connection on either end, or whatever outlet the amp was plugged into.
     

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