The hum is probably from too much DC in the power line (DC Offset). Blame your power company. While you can issolate the hum with "anti-vibration stuff"; fixing the power is the real solution.
The various power regeneration, balanced power, power issolation devices that use their own transformers to produce clean power will probably do the trick. However, the cheaper ones might hum themselves since they'll be getting the same lousy outside power (LOL!!).
Never tried the PSA Hum Buster, but I assume it works.
Power "conditioning" or "filtering" will not work.
The various power regeneration, balanced power, power issolation devices that use their own transformers to produce clean power will probably do the trick. However, the cheaper ones might hum themselves since they'll be getting the same lousy outside power (LOL!!).
Never tried the PSA Hum Buster, but I assume it works.
Power "conditioning" or "filtering" will not work.