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HELP!! My Zoom B3 has developed a hum

Discussion in 'Effects [BG]' started by lotusland9663, Feb 17, 2014.

  1. ...I know - it hums because it doesn't know the words - lol

    The hum is the same frequency as a B note on the 4th fret of the G string. It remains the same (low) volume regardless of how loud my bass/amp is.

    I've tried the B3 with 3 different amps - same result

    I've tried it with 4 different basses - same result

    I've swapped out and tested all the power cords, and patch cords - no problem there

    There is no hum when I use it with headphones - only with an amp and speakers

    Any ideas??
  2. Do you tune a 1/2 step flat?
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  4. Try plugging it into a different wall socket? Any other pedals sharing the 9v power supply?
  5. Sounds top me that the L/Stereo magic jack on the B3 is defaulted to a stereo output, try the R output.
  6. Thanks for the suggestions.

    I've used different wall outlets in different locations (home, studio, rehearsal space)- same result

    No other pedals are used with the B3

    And it doesn't matter which out (L or R) I use - no difference

    I guess the next step (maybe shoulda been the first step) is to contact Zoom and see if they have any suggestions
  7. DiabolusInMusic

    DiabolusInMusic Functionless Art is Merely Tolerated Vandalism Gold Supporting Member

    I would try to use another power supply if possible, maybe see if a local store can let you try one if you don't have a friend. Odds are the problem is in the unit, but it could be the power supply. Other than that I would jut contact Zoom.
  8. ZenG


    Dec 13, 2013
    Maybe you have a "groundloop" hum........

    I had a groundloop hum that came from my bass amp......I isolated it to the amp itself....but you could hear it elsewhere when I connected the amp to other equipment.

    I used an Ebtech anti-hum plug....plug this in the wall (3 prong) and then plug amp (3 prong) into that.

    It didn't entirely eliminate it but it certainly reduced it bigtime.

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