So that RCA ground tab/washer was the issue. It amazes me how one "little" thing can cause quite a showstopper. Just spent the last few hours listening to some records. I'm definitely pleased. I purchased the upgrade kit as well, but will wait till I'm ready.
Gotta say, it was pretty cool learning about that trace signaling. I've heard it before, but never knew what it was.
Thanks for your help and patience PB. Much appreciated.