Help with my analog rig.

I had a slight buzz or hum problem, seems when I was exchanging and trying new interconnects the WBT's weren't as tight as could be. Was driving me crazy. Just a thought.

In a single-ended system, there are many sources of hum. Tubes per se are usually NOT one of them. You probably have a ground loop somewhere. Try ungrounding some of the items that are now grounded. You don't tell us much about that. Have you grounded your tonearm? Your turntable? Etc. Have you tried bypassing the Running Springs (never heard of it, but great marketing name)? Above all, I would advise you not to buy another piece of gear to cure this problem, because you have zero idea of the cause and it would be a complete shot in the dark. As to RF; what are you hearing that makes you think you have RF problems?

Typically if the noise increases with volume a component is the problem. However, there are easy but time consuming ways to diagnose the problem. It would help if you had a set of shorting plugs handy for the diagnostics. Maybe even a set of Jensen plugs used specifically to detect ground loops. Cheater plugs are also something you should have on hand.

In any case remove everything from your system but the amp and speakers. This means removing all appropriate interconnects and power cables. My recommendation would be to plug your amp into a wall socket, not the Running Springs. Short the inputs of your amp and turn it on. Listen for hum and noise. If you hear noise it could be the problem or just one piece of it. Try a cheater plug on the power cable and see if the noise goes away. Continue hooking up each component one at a time repeating the exercise.

The Ground Zero never worked for me and is more pain than pleasure IMO. Running Springs makes great products but don't rule it out as part of the problem. I typically have only one component grounded in my system and float the grounds on the others. This may or may not work for you. Also, is your equipment single ended, balanced or a combination of both?

Time to call in an experienced electrician to check the power connections at the panel box, outlets and from the street service. I doubt it is an equipment problem.