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Guitar hum can be a very difficult/complex issue to deal with. All those balanced power boxes won't do a thing for RF/EMI, unless it's coming from the line itself. The $2000 unit I demoed actually made my guitar hum LOUDER.
Start by shielding your guitars. Suhr makes a backplate that is supposed to work miracles for strats.
The next step would be to hire an electrician qualified to deal with audio issues.
Balanced power is not a cure all for guitar amps.
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