Okay-
The whole saga as I have finnaly figured it all out:

We got a new shed out in the yard that I am going to use as my workshop. I have been working to finish the interior, so I have an electric space heater in there on an extension cord from the house. I didn't know it, but the exterior outlet that the thing is plugged into happened to be on the same circuit as the AV gear.

So, I noticed my M200 amps humming a couple of days later. I called Outlaw and Scott suggested it was a voltage or current drop in the line from something else pulling a large load. I figured out it was the space heater. Scott said it did no harm to have the amps hum, so seeing as how the space heater was only temporary, I didn't want to run an extension cord from another circuit as I could live with the hum for a few more days.

So with the amps humming every once in a while. I started to notice a color bloom in the corners of my TV. I had an old set of speakers that I thought were shielded next to the TV for a little while and thought they might have done it. The TVs self-degauss wasn't doing anything for days, so I figured the speakers had screwed up the shadowmask bad enough to need a manual degauss.

Well, the lightbulb went off in my head and I woke up at 3am and checked for Santa, then the TV. Colors still there, I turned off the humming amps, ran the extension cord and waited a few minutes to let the field dissapate.

I Turned the TV on and -magic-. The degauss actually worked and the picture is perfect again. So, yes, the transformers were putting out a huge magnetic field while they were humming.

So, to recap: Space heater on same circuit as M200 amps caused voltage drop, making amp transformers hum. Humming caused magnetic field that screwed up the TV. Fixed by putting amps on another circuit while space heater is in use. Permanant fix will be to run a dedicated line for the AV gear. Phew!
I need an Egg Nog.