When you say the electric isn't great in your house and you are trying to eliminate hum, it's good to know if your outlet is really grounded or not. People put three prong outlets in boxes with only 2 wires which makes for an ungrounded outlet. Buy or borrow and outlet tester so you know what you are dealing with. If you run a wire to the outlet cover screw of an ungrounded outlet, it will do nothing.
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