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Ampeg B4R buzz problem

Discussion in 'Amps [BG]' started by robbiebruce, Jan 24, 2014.

  1. robbiebruce


    Jan 24, 2014
    Hey, I've been searching online for a few hours now and I still haven't found any sort of answer to this problem. I've got an Ampeg B4R that makes a loud buzzing noise as soon as it's cut on. It doesn't matter if anythings plugged in or not, and volume and tone adjustments make have no effect on it. I've tried different basses, speaker cables, cabs, power cords, and outlets. I'm at my wits end. Has anyone figured out the solution to this problem?
  2. JimmyM


    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps
    Yes, take it to a tech. Sorry, but it's a solid state amp, and unless you're experienced with them, it's best to let a tech deal with it. One thing you can try is to clean the effect loop jacks with contact cleaner or by inserting a plug into the jacks rapidly over and over a few times, but I don't know that will fix it.
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  4. beans-on-toast

    beans-on-toast Supporting Member

    Aug 7, 2008
    If it is 60 or 120Hz, it could be a bad power supply cap.
  5. Dawntreader


    Aug 23, 2013
  6. That would be my guess as well. Simple repair.
  7. green cm

    green cm

    May 4, 2015
    I know this is old, but same issues here. Any solution?
  8. JimmyM


    Apr 11, 2005
    Apopka, FL
    Endorsing: Ampeg Amps
    Well, I think the old answers still apply.

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