Looks to me as if the TV is overscanning quite a bit. I have never seen a color bar pattern fill a round screen that much. Also, I did not see any burn marks on the CRT when I looked at your pictures of the set in operation. The ion burn must be very small, almost like a flyspeck. In any event, it isn't noticeable (at least, as I said, I don't notice it) on the pattern from the generator or on the pic of the ID screen from Syfy. It may be that the burn only shows if one looks at the picture in person and not on digital photos.
