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Ampeg B2RE squealing ultra mid (updated, edited post)

Discussion in 'Amps and Cabs [BG]' started by DeliriumTremens, Aug 8, 2016.


  1. Common issue with these guys? The other pots seem a bit scratchy when turned so I'm hoping it's just dirt inside but I'm wondering if there are known problems with these amps. It's a SLM era model. Thanks
     
    Last edited: Aug 9, 2016
  2. BassmanPaul

    BassmanPaul Inactive

    You have a bad connection inside the amp so therefore it’s tech time. :(
     
    DeliriumTremens and /\/\3phist0 like this.
  3. Kind of suspected this, but I got it for free because of the issue so I don't mind putting a little cash into it
     
  4. BasturdBlaster

    BasturdBlaster

    Feb 19, 2012
    Crandon WI
    I have had something similar if not the same issue on an SLM SVT350H as well as a LOUD B2RE. IIRC, the tech told me it was a 25cent Zener diode in the output protection circuit. Of course it cost 75 bux in labor (and in my case-plus shipping). It's really hard to say what's really happening/wrong though, if you don't have a good "fix-it" shop locally, I would check the Ampeg website for a list of authorized Service Centers and hopefully you can get it fixed. Last year I had my SVT4 serviced, it was 35 bux to diagnose/estimate the repair which went toward the overall cost if you go forward with repairs. Keep in mind that those heads can be had for 200-250 range. Hope things go well/inexpensive!:)
     
    DeliriumTremens likes this.
  5. Thanks that's something to go on. I think engaging the limiter was making it happen, I'll check when I get it home tonight
     
  6. wave rider

    wave rider

    Jan 5, 2005
    Does it have a preamp tube?

    =wr=
     
  7. Not to my knowledge
     



  8. Okay, I plugged it in at home and it seems the ultra mid knob is the culprit. The other knobs are scratchy when turned but the mid knob goes off into crazy theremin type sounds when used and the input clip light goes on. Otherwise the amp seems to operate fine, before I touched the mid it was good... I have the master at 0 in the clip
     
  9. BasturdBlaster

    BasturdBlaster

    Feb 19, 2012
    Crandon WI
    DeOxit time?
     
  10. I turned the ultra mid a bunch of times with the power off and it seems to have remidied the situation!
     
    BasturdBlaster and wave rider like this.
  11. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
    Apr 10, 2021

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