I would wager its the transformer. Have you taken wire and grounded everthing to each other? And now I read your post again, why do you have a two prong post on a 220 amp? Did not come from Sonographe that way I am pretty sure. Run a ground wire from your amp to your 3 prong pre amp, thats gong to help some, but I still go back to the step up trasnsformer.
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