Harmony Central Forums
Announcement Announcement Module


Harmony Central has “soft launched” our new mobile experience this past week. While we have done extensive testing, we know that with a community as large as HC that there will be items that surface that will still need to be addressed. We are asking that you utilize the thread belowto report any challenges you may encounter. Here are the things we request you provide: A brief description of the issue, the device and operating system version you were using, the browser and version, screen resolution, and a screen shot of the display.
Thanks for your patience as we work towards the best experience we can provide to our community.

See more
See less

Ampeg J12T Tremolo Noise- Any Suggestions? What's Causing It? And, Attenuator Okay?

Page Title Module
Move Remove Collapse

Conversation Detail Module
  • Filter
  • Time
  • Show
Clear All
new posts

  • Ampeg J12T Tremolo Noise- Any Suggestions? What's Causing It? And, Attenuator Okay?

    Just recently got a nice little Ampeg J12T guitar amp. Two EL84's and two 12AX7's. It was filthy, so I removed the chassis, speaker and reverb tank, washed the cab, let it dry. Also took the circuit boards out of the chassis, and used almost a whole can of auto-shop contact cleaner (not De-Ox-It, but the stuff I used is plastic safe, etc.) on the scratchy pots and the tube sockets. Then I blasted the circuit boards, top and bottom, with the same cleaner- they seemed to have a slight film (nicotine?) on them. Put the amp back together, and the pots are much quieter, but the tremolo still makes a static-y sound that gets more pronounced the more I turn up the tremolo intensity. I thought it might be a tube, but I read that the tremolo and reverb on this amp are solid state. I don't have a schematic for this amp, and even if I did, I would not know what to test or replace to address this problem.

    Anybody have this problem licked? What did you do to fix it? I'd love to have the on-board tremolo working right- everything else is okay, including the reverb, and it's a sweet, portable little amp. I have a tremolo pedal, but it seems silly to cart around a pedal for something the amp has and does well (except for the noise.) Good help is hard to find, but if anyone here can offer some learned or experience-driven wisdom, I would be so appreciative.

    Also, I have a 50-watt attenuator. This amp lacks a jack and plug for the speaker, but I can not imagine any reason I could not install one. Will this amp do well load- (speaker) attenuated? I want power-tube OD, NOT pre-amp tube or stomp-box OD.


  • #2
    bump. Anyone? Anyone? Bueler?


    • Prairie Dawg
      Prairie Dawg commented
      Editing a comment
      Did you ever figure this out? I've got a SJ12T that has the same issue.