Electrician's advice wanted: safely lifting ground

Death is always lurking. Better to live less afraid and enjoy it than hide like a worm forever.
Possible failures and fears can create a living hell all just in your mind.
I'd get over it.
I have stuck my fingers in PLENTY of live A/C.. And, unfortunately for you, I am still here.
(when you start grabbing 240V+ standing in a full tub of water..or 600V+ with some amps behind it... THEN worry, but just a little..)

yeah, some folks are afraid of tube amps, imagine that. like capt. beefheart said it's "safe as milk" :)

Wow, what a great thread, I really like (and agree with) Elizabeth's rules for living, and who'd believe someone would actually quote Captain Beefheart. Way to go, Pehare. This thread has really brought out the "inner poet" in you two.

Regarding ground loops, consider trying Jensen input transformers just ahead of your amps. Totally solved my problem going from a single-ended preamp to my balanced only amps. Went from all sorts of noise (almost sold the Clayton's) to dead-nuts quiet. Go to their website and give them a call - very helpful folks and the stuff is not that expensive. BTW, since you have "multiple amps" be aware that they sell single line models of the transformers that may be logistically easier for you than the twin versions shown on the website. They will make them as you need, rca-rca, xlr-xlr, rca to xlr, and xlr to rca.

Outsiders do not appreciate the dangers audiophiles routinely embrace . . . all for the love of music . . . Courage!

yeah.. I'm sort of surprised too that the origin of the loop wasn't or isn't being addressed by the Jensen idea or some other like Dayton. Finding the unit causing it I'd think is the better approach, if after all, you want to do things the right way here.