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Hum detection: Amp or Cab?

Discussion in 'Amps and Cabs [BG]' started by isky, Mar 26, 2018.

  1. isky

    isky Supporting Member

    Jul 6, 2008
    Madison, WI
    The rig: Genz Benz Shuttle 9.0 -> Audiokinesis TC115

    No issues ever, and now all of a sudden there's this hum/rustling coming out of the speaker and especially the horn.
    It's still there when the amp is in "mute" mode, and disappears only when the volume is all the way off.
    Odd thing is: everything works fine for 5-10 min when I switch the amp on, and then gradually the noise appears.

    What could be the issue? I'm not much of an amp/cab specialist, therefore the layman question: can it be the preamp tube? Time to change it?

    Any thoughts?
  2. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Well, it can't possibly be the speaker, which makes the troubleshooting a whole lot simpler.

    There are quite a few possibilities with your amp, possibly the tube but not all that likely.

    I have a flat rate service program for the GB amps, PM me and I can get you the information.

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