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That the hum goes away when you lift the ground tells me that it's not your equipment. The last time I had one of these problems, I started swapping interconnects and then the problem went away. I got a few pair of the Cardas braided interconnects and my hum went away. For me there was some mismatch between gear and the braided interconnects solved the problem.
It may be worth the time working on to solve because you tend to hear more with headphone amps. You may want to try the cheapest interconnects possible from Radio Shack just to see if a change-up in interconnects help.
Actually, I mentioned in my last post that I have now determined that lifting the ground does not eliminate the hum; I thought it did at first, but after checking it out further, I can still hear it. I have also tried several different pairs of interconnects, but that's not the problem since the hum persists even when the Woo is plugged directly into the wall with nothing else connected except headphones.
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It definitely sounds like a ground problem in your electrical system. Do you have cable TV? Those systems are notorious for ground loop issues. If there is any way to disconnect your cable connections that would tell you if that's the culprit.
No, no cable TV. I have satellite TV, but in a different part of the house, and on different circuits.
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+1
The mere touching the coax will give it up (grounding issue or no?).
I'm almost positive it is coming from the amp, and is not a house wiring, etc., issue. Wherever I plug the amp in, even in my shop (which is a separate building behind my house where I work) the hum is there if I listen closely.