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cyclic hum/buzz ampeg ba115hp

Discussion in 'Amps and Cabs [BG]' started by indieandrew11, Mar 26, 2009.

  1. hello all!

    i wanted to see if anyone could offer some advice on what i could do to isolate and/or repair this problem. it seems to be correlated with the built in tuner. it will hum until the green light flashes, when it will then go quiet, and begin to hum again when it goes off. it also seems to be overly sensitive to grounding issues, like when a 1/4" cable is plugged in and not also into my bass. it also will have a high buzz when i get too close to the amp with the bass plugged in.

    any help will be greatly appreciated!

  2. MIJ-VI

    MIJ-VI Banned Supporting Member

    Jan 12, 2009
  3. the engine

    the engine Guest

    WOW...Another Eastern NC bassist! I thought I was the last of our kind! Anyway... A couple of questions:

    Does it do this everywhere?
    Have you tried borrowing a really nice power conditioner (when I say "nice" I mean like several hundred dollars, high end Monster stuff etc.) to see what effect (if any) it will have?

    I'm an electrician as well and my gut tells me it has as much to do with the power where you are as it does with the amp itself. But I could be wrong. Keep us posted.
  4. it does do this everywhere, and i have played at great big churches with pro sound guys running the show to little outdoor venues and everything in between. i was told by some of the guys in the tech lab here where i work, who are also musicians that it was probably a filter cap (not to say you are wrong), but now the problem is which cap is it, and where can i get new ones locally.

    and nice to meet a fellow east nc bassist too!

  5. Cable plugged in to amp and not to bass. This is quite normal. The tip of your plug is floating and will pick up hum and noise from the environment. If you touch the tip, your body will increase the amount of noise being picked up.

    Hum as you approach your amp. Your pickups create a magnetic field as does the power transformer in your amplifier. The nearer you get to your amp the more these two fields interact thus hum. Again quite normal and even humbuckers will do this.

    Your tuner issue i am unsure about. Perhaps you can explain more fully?

  6. even when nothing is plugged in, it will have a buzzing hum and it seems to be correlated with the built in tuner. when the green light comes on, it goes away but comes right back when it goes out. it flashes constantly to show that its ready.
  7. ashtray9


    Aug 1, 2002
    Tempe Arizona
    When/if you get this figured out, sell it. I had a B115 combo that started giving me early warning signs (like humming) and I dumped it before it got worse. These things seem only built for bedroom work. BTW, the amp started acting up after a few gigs where I cranked it, so it seems to be a thermal issue.
  8. MIJ-VI

    MIJ-VI Banned Supporting Member

    Jan 12, 2009
    Hi indieandrew11.

    The Ampeg (pdf) BA115HP/BA210 Owner's Manual (it includes the amp's BLOCK diagram) can be downloaded/viewed HERE.

    Hopefully it can help the more tech literate members of TalkBass to troubleshoot your amp's problem.
  9. MIJ-VI

    MIJ-VI Banned Supporting Member

    Jan 12, 2009

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