Extremely LOUD tone coming from BIAS AMP HEAD



  • Well today my AMP HEAD has gone bonkers! Anything plugged into any of the outputs now gives an extremely loud tone and nothing else. Speaker cab...loud tone. Balanced and Unbalanced outputs...loud tone. I'm talking ear piercing high pitched digital tone. I've changed from series to parallel...loud tone. None of the knobs are responsive on the front of the unit and has no affect on the tone or its loudness. I've factory reset the unit and it still does it. I've changed absolutely nothing to how I use it...it stays in my guitar studio and worked fine up until the second time I tried using it today. It's been plugged into a Furman power regulator, but I did switch power sources just to check...same loud tone.

    Any thoughts...tricks? I just contacted support so waiting to hear back from them.



  • Turns out it was a mainboard that needed replacing. Luckily it was covered under warranty.