A slight hum coming from my amp

I have a slight hum coming from my amp. It is not present in the speakers. Anyone know if this is normal or a problem?
Thanks
Greg

gdush10-13-2012 1:13am

Post removed Aug 12, 2015
roscoeiii Details Discussions Posts This discussion Message User 1,155 posts 10-13-2012 at 04:18pm Copy Comment URL Report Comment Edit Delete Could also be DC on the line, which can be eliminated with a PS Audio Humbuster or a similar product from CI Audio.