ok,just checking.

Have you tried isolating your Amp? That worked for me.

I don't know what is meant by isolating the amp.

You probably have all or most of your equipment plugged into a surge protector that is then plugged into an outlet in the wall. Put the plug for the Amp into a different outlet. If the humm goes away, get yourself a seperate surge protector for the Amp and plug it into that outlet.