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Broken Bass head?

Discussion in 'Amps and Cabs [BG]' started by Zach Pritchard, Feb 5, 2016.

  1. Zach Pritchard

    Zach Pritchard

    Feb 5, 2016
    20160205_102935. 20160205_102941. 20160205_102949. 20160205_102955. 20160205_103001. 20160205_103006. 20160205_103013. I work in a college in their music tech department, and one kid had the bright idea of plugging a jack into an audio interface via the speaker outputs on the back of the head. People then complained they smelled burning and when we tried to turn the amp on it would only produce a loud buzzing sound. I've attached some images to see if anyone can spot anything immediately wrong with it.

    Amp: Ashdown MAG 300 Evo II
  2. You did not include a photo of the kid with the bright idea. That's where the real problem lies.

    But seriously, these are very good photos and I don't see any signs of anything that looks like it got hot.
    Unfortunately, many electronic problems, even those that smell funny, don't leave visual clues.
    So here are a few initial questions:
    When you turned the amp on and got the buzz, was it connected to speakers? Or still connected to the audio interface?
    If you have nothing connected to the amp except the A.C. power, does it still buzz?
    Does the amp work properly when used normally?
    Are you sure the smell came from the amp and not from the audio interface?
    If you run the amp for a while does it begin to smell again?
  3. Zach Pritchard

    Zach Pritchard

    Feb 5, 2016
    Sorry for the late reply
    When we turned the Amp on it was connected to the speakers, however we connected the speakers to another amp head and they worked fine, so it must be an internal problem. We unplugged it from the interface straight away so that it didn't get damaged (didn't fancy paying another grand for an apogee quartet). There was no buzzing when it was unplugged but left on. After we tested it a bit it seems that it IS picking up input from the bass (the VU metre was flicking a little), but it isn't coming out of the line out and is only causing a buzzing out the speakers, so it may well be something between the input section and VU metre and before the output.
  4. Your amp is busted so “Tech Time.” Sorry.
    Old Garage-Bander likes this.

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