how to get rid of hum

I have had 2 episodes with hum. Cable TV coaxial lines are notorious for carrying hum into a stereo system. Try disconnecting coax lines and see if this is the source of your hum. A small isolation transformer put in the coaxial cable eliminated this hum. Some components with 3 prong AC plugs can cause hum in my experience. If you can find the offending component then a cheater plug (one with 3 slots on one side and 2 spades on the other side) may do the trick. This happened to me with a turntable, the cheater plug eliminated the hum.

I am having the same problems with hum in my system. I've tried lifting the ground, but doesnt work.

"If you can find the offending component then a cheater plug (one with 3 slots on one side and 2 spades on the other side) may do the trick. This happened to me with a turntable, the cheater plug eliminated the hum." -Rfj5106
-was that one component responsible for all the hum in the system? i get hum without any interconnects to my amp...

"Cable TV coaxial lines are notorious for carrying hum into a stereo system. Try disconnecting coax lines and see if this is the source of your hum. A small isolation transformer put in the coaxial cable eliminated this hum."-Rfj5106
-my system is a 2 channel system... does this mean that the coax cable for my cable tv in the other room can cause hum in the ac lines even when my ground is lifted?

If the amp puts out a hum when all other components (except speakers) are disconnected, the problem is the amp. Turn the amp off before disconnecting, then turn it back on to check.

Breaking off the ground pin on a three-contact plug is not a good idea, and could even be lethal. Those are there for safety. If you have a "ground loop" making its way around through the power cords, it would be a lot safer to try to fix it by connecting all to the same outlet. Or better yet, get an isolation transformer.