I have an orig Threshold S-500 and it needs atten


My S-500 was blowing mains fuses up to 15 ampupon turn on. Now it won't power up period.Q. Wasn't there a man named sodderburgh, soderman or such who used to work for nelson at the threshold firm and now is the man for repairs? Help!
misteresistor

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I have Oasis s-200m huge mono amplifiers. Keep blowing fuses on turn on. Only one amp is affected. Can anybody help?