Thanks for your advice guys, well it seems that for some strange reason the ion trap magnet has decided to reverse directions. When I turned it around the picture comes in bright, but I'm positive it was only working the other way around before, because I used to have to reach around the tube neck to undue the wing nut to remove the magnet, now the wing nut is on the other side so its easier to remove, go figure.
I tried the other picture tube and it is remarkably brighter and clearer, but its so clear that now I can see I have a wave moving from the bottom up to the top of the screen. Its hard to tell if its a one part wave (60cps) or a two part wave (120cps). Usually the electrolytic are suspected with this symptom but I've replaced all of them. Hmmm back to the old drawing board.
