speaker ground hum

No apology necessary, Jea48. I'm just not equipped to defend the checklist's validity without further study of your criticism, which I admit I am too lazy to do.

I will say the source of the buzz was finally traced once the tech instructed me to systematically plug all the components into an extension power strip that was alternately plugged into several different outlets in the room.

The problem turned out to be lack of common ground between certain outlets.

Raybo76, Many times the culprit is the Cable TV cable or an outside antenna cable. Make sure you unplug all cables of these to test.

All excellent suggestions. If all else fails have
your Cable TV ground checked where it enters your house.
This eliminated a terrible hum in my family room
surround system. Good luck.

want to thank everyone who responed to my problem ,the audiogon community are great people....thanks again ..raybo76....