Did anyone manage to ``repare'' a buzz, ever?

I'm not an electrician, but I know dimmer switches emit heavy ac waves, even when turned off. So your gear might buzz even with the lights off. If it doesn't buzz hooked up to another socket elsewhere (without a dimmer attached to that fuse), then it's the dimmer switch. Or, if the buzz gets louder when the dimmer switch is set higher, that's a good way to find out too. Also, if the lighting is track, there will be transformers present somewhere - maybe in between the wood beams between floor levels. They also emit ac waves. If you find the dimmer/track lighting is the reason, you can replace the switch will a standard on/off switch, and that might reduce it a bit. If it's the tracking light/transformer, then short of gutting your ceilings and installing new lights, I guess you'll just have to deal with it (I have to). Make sure to throw the fuse switch before installing a new light switch. Hope this helps.

I had a buzz that a technician fixed by re-soldering some connections that had hairline cracks.

On the off-handed chance this may help....a few years ago I found the source of a buzz in my system thru luck. The system was completely ground-floated except for the tube preamp and, at higher volumes with no source signal, it was very clear - annoying bzzzz. After trying quite a few things, I grabbed the metal rack to support myself and moved to the back of the preamp to take another look and touched the case. No, no shock! Just no buzz. It completely disappeared! I wound up taking a lead from the pre's grounding post to a connection on the rack and have been happy ever since....well, except for that tweaking stuff! Good Luck!

This was the very problem that I had for 8 months. I tried everything. I finally found the problem when I replaced a pair of RCA intercon that had one bad connector.

I manage to reduce my ``buzz'' plugging these cheap 5-cents IC's into the unused RCA input sockets. (I cut the connectors off and isolated their wires first.) I found this ``recipe'' in the forum discussing those Cardas caps (well, they seem do not help but look just great). This method does not kill the buzz but made it somehow much less annoying and not that loud. How long I can live with this remains to be seen though. Thanks again for all your help.