Try unplugging every appliance in your house one by one. I had an amp that hummed. The hum stopped when I unplugged my waterbed heater. I bought a new waterbed heater and the problem was solved.
Have you tried using a ground cheater. Ace hardware sells them for $1 and it converts a 3 prong plug into 2. I have some tube monos which need them, and a pair of SS monos which dont.
Sailor, contrary to the above post, don't give up the ship yet! Is the hum from the amp chassis or the speakers? Is the hum constant, or intermittent? Is it source dependent?
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