After sitting for months, in a protective carrying case, my GK MB Fusion 500 developed an inexplicable scratchy-ness and distortion in the gain stage pots, and to a lesser degree in the main volume pots, rendering the amp pretty much useless, unless I go in through the effects return and don't turn the volume knobs too much. Research has indicated the requirement of replacing all pots, as they are sealed...Apparently, it's not uncommon for these amps. I'm obviously disappointed, especially...

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