Amp - Loud humming noise.

[martinm]

I get hum from my amp caused by the mains broadband distributer (power lines or something they are called). Doesn't effect the music enough for me to go turning it off every time but it quite noticeable when close to the amp.

You don't happen to be running one of these do you?

 

[Jack Palance]

I vaguely recall something about Kimber cable years ago. Not sure if its the way it's twisted together but it can be a problem with some amps.