Would a power conditioner stop a 60 cycle hum ?

Is the existing outlet grounded ? IMO, the branch circuit by itself should not be causing a 60Hz hum. You should start with you amp alone hooked up to your speakers and connect your other components one at a time to see which is causing a ground loop.

An Equi=Tech conditioner is not going to be cheap, and may cost more than what the electrician would charge to install a new dedicated line or two. Their smallest Son of Q unit (1kW rated) is $1489.00.

Garebear,

I assume all your audio equipment is plugged into one duplex receptacle or maybe 2 duplex receptacles but both are fed from the same branch circuit breaker. Correct?

Do you have a CATV box receiver connected to the audio system? If yes that is more than likely the problem. A difference of potential, voltage, exists between the CATV Cable Company’s coax shield and the safety equipment ground of the 120V AC power system feeding your audio equipment.

If you do have a CATV receiver hooked up to your audio system try disconnecting the Cable Company's Coax cable from the receiver and see if that stops the ground loop hum.

If it does buy one of these. A Cable TV isolator.
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Get a Hum X from Ebtech.

Get a Hum X from Ebtech. My conditioner (APC H15) did not eliminate the hum caused by my RT707 reel to reel. I finally had to put a cheater plug on the APC H15 to eliminate the hum. I am awaiting delivery of my Hum X.

...thanks everyone but what the hell is a Hum X from Ebtech. The system is on a seperate circuit that my cable TV, I worked with an electrician who moved the ground wire of the cable to a difeerent part of the circuit box......did not work.