Grounding Hum

I just tried the separate piece of wire trick. That didn't work. Now, I'll try moving the 'table and see what happens.

Here's some additional information, which may help:

If I flip the switch on my preamp (NAD1155) from MC to MM, the hum reduced, but doesn't go away. However, it seems that I, then, act as ground, because there is a more pronounced hum whenever I touch the preamp. The hum comes from both channels. A bypass wire from the turntable to the preamp had no effect. Moving the turntable (to the extent that I could) had 0 effect. The amp (B&K ST-140) is connected to a Stax SR34 headphone preamp. Then Monster Cables from the Stax unit to Vandersteen speakers.

Thanks to all those who contribute to my problem resolution.

Lee

It's Monster Cable interconnect cable, if that helps. Besides taking the cable apart, is there a way to tell if it's shielded?

The situation gets weirder, and weirder....

As any good technician will do, I disconnected everything from preamp, still a buzz. I even unplugged the TT! After that resounding flop of an experiment, I swapped out the amp. Still a buzz. So I've eliminated the CD player, the TT, and the amp. All that's left is the preamp, the Monster Cables, and the VPI 16.5 (which is only drawing power when I'm cleaning an LP). The Stax headphone preamp is going to get taken out Sunday morning. Then the plugs get reversed. The other thing I thought of is that I have PC plugged in to different outlet, but they could be on the same circuit. I'm scratching my head over this one... Grounding is certainly an art, not a science,

Well, there's more than one way to skin a cat, and this cat will get skinned!

I've tried every suggestion, but still no success. I've even tried "shielding" the preamp, the amp, and the TT with tinfoil. No luck. Any other suggestions? I'm scratching my head so much it may start to bleed.

I finally (3+ days) figured out. I pass along this update in the hopes that it helps someone else out. The source of the hum wasn't grounding at all. It was airborne RF given off by a Kodak camera dock in a distant room. All I can figure is that the electrical circuit for that device went through a wall behind my stereo system.

A big thank you to all those that responded.

Never mind what I said in the previous post. The buzz returned. After venting my frustration, I went to turn the volume up on the preamp, so I could the noise while I went around the house searching for the source. When I went back to the preamp, I inadvertently touched the faceplate, thereby grounding it, and the hum stopped. My conclusion is that the preamp itself is having a grounding problem, that only be heard when the phono input is selected. So the issue becomes one of grounding the preamp. Any suggestions? I don't want to have to act as the ground myself...