Dear @pauly : In all my system items only my phonolinepreamp is grounded and from this item is from where the audio signal goes to all other electronics items avoiding this way ground loops that always are noisy.
Now, years ago I decided to have a true ground coming from the earth so a " technician " did it: he, as @oldhvymec stated , took a 2m. copper rod in a hole in earth ( at around 2-3m deep. ) where previously he puts a combination of some " ingredients " as salt and the the rod gone there with the attached cooper cable and he close the hole and that cable is connected to my phonolinepreamp. That's it. Btw, that connection goes too at my dedicated electrical line where my system is fully regulated.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
Now, years ago I decided to have a true ground coming from the earth so a " technician " did it: he, as @oldhvymec stated , took a 2m. copper rod in a hole in earth ( at around 2-3m deep. ) where previously he puts a combination of some " ingredients " as salt and the the rod gone there with the attached cooper cable and he close the hole and that cable is connected to my phonolinepreamp. That's it. Btw, that connection goes too at my dedicated electrical line where my system is fully regulated.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.