Are both on the same circuit? Do you have a dedicated line for your equipment?
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First change either the fridge or the amp to a different circuit. If that doesn't work, try floating the ground - You'd just need one of those .99 cent cheater plugs that allow you to plug in a three-prong plug, while only having two prongs to plug into the outlet (having eliminated the grounding plug). Give that a shot before spending big bucks on an aftermarket cord.