Question about MXR M288 Bass Octave Deluxe

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Growl knob not working mxr 288

When I start moving the knowb clock-wise the volume of the octaver doesn't turn up. Sometimes when I reach the end of the turn it starts to sound but at a very loud volume.

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I would get a can of good electrical contact cleaner and open the unit, spray the cleaner into the back of the controls while rotating them back and forth quickly. This will somewhat clean the control contacts inside eliminating most dust and corrosion. If the control is too old and dirty, it may not work but, I would definitely try. It probably has a special made potentiometer that would be hard to find and replace. They usually have special legs attaching them to the board. I am almost positive that the control is bad or dirty, though. If the sound gets loud when almost all the way up, it does indeed work, just not in a dirty position. That already proves it.

Posted on Mar 29, 2014

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Posted on Jan 02, 2017

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