Very cool and very helpful. However, my situation is a little different in that I have a standalone system, ie nothing connected but the speakers. I've turned off flourescent lamps and other "things" on the same circuit and still hear a hum, very low and faint. I suspect it's the system, unless of course due to the wiring (which is 60+ years old) may be shared on another outlet, where some other device is the culprit?
i plugged the CDR player into the same outlet as the amp. problem solved! (at least 80% better). If not for this site, i would have never known such a simple solution existed. thanks to everyone
just tried clicking to page 2 from page 1 .got a warning about viruses ..www.pictureshareworld.com this might be a false positive but i don't think so as i very rarely get these warnings