Most Effective Tweaks?

mapman,
Thanks for the details!
This has been an ongoing issue for me for years. It's managable but creeps into audibility at higher volumes. I've chased it with ICs, power cords, rack placement, "cheater plugs", medium output cartridges, etc. I think the hum is associated with the placement of my rack in the room (in front of an ornamental fireplace with the furnace/boiler directly below in the basement) and I have no options to move the entire rig. I have the system on a dedicated line also. So seeing your post, I was wondering if the mu metal might be wrapped around my already shielded ICs or some other placement around the rack, or even in the basement.....
Might be worth the experiment.
Thanks again!
Dave
PS: I know there are many Audiogon forums on RF.
  

A good woman and some wine. If she loves the music like we do, then I find having someone there to share the music while sipping on some great wine works for me. At that point, I'm loving the music and thoroughly enjoying how fantastic my system sounds without thinking about the next upgrade, etc.

On the hardware side of things, a really stellar audiophile outlet on a dedicated 20 amp line can make a huge difference. For relatively little cash outlay, in comparison to major components, it can really shock many people. Even if you already have a dedicated line, but a fairly generic hospital grade outlet, the truly excellent outlets are a big step up.

Paper if source is in basement as you suspect then you might be able to place a flat my metal shield between either on ceiling in level below or floor on upper level.   

If if so then you might be able to hear differences in the noise level if affected device can be raised and lowered somewhat while playing.  

Jerroot, I've done the same trick using lead shot (got it from a gun store) and then filling the gaps with sand.  Not as cheap--about 40 dollars per stand, about 35 lbs. of shot per stand.