Grounding Hum

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 have been dealing with noise/a hum in the path of my turntable and phono preamp. It's a royal pain. The only other suggestion that I have heard that has not yet come up here is to find a cheater plug (on that reduces the three prongs to two) and try that on the amp and the turntable.

It appears that my noise is a result of outside interference (radio, tv, ???). I'm trying some different cables as well to see if I have any more luck reducing the noise.

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 had a hum coming thru my preamp from a little 12V transformer used to power something unrelated that was too close to the pre.....look around the unit for anything that might cause the problem. Also turn off any dimmer, automatic light sensor and flourescent fixtures anywhere in the house. (auto light sensors and dimmers can create havoc).

Is the IC that runs from your preamp to amp shielded? I recently had this same problem and discovered that it was said IC and not the TT ground. Switching to a different IC did the trick for me.