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Eric,
I had a 48-2500 so I can also be classified as officially crazy. I brought it all the way home from Rochester, NY on the roof of my Safari minivan. Took 6 of us to perch it up there at the swapmeet.
Mine had a raster too. I sold it to finance the acquisition of an even heavier projection set a few years ago. I now enjoy a non restored RCA 9PC41 instead.
That screen is soft aluminum with a very fragile micropitted surface. You cannot rub it with a cleaning cloth or it will be marked. It is basically the same screen surface that all those curved screen Advent videobeam projectors in the bars in the 80's had that always got ruined when someone tried to clean it. You have to use non-contact washing technique. It looks to me like you have liquid stains there. Try removing the screen and laying it on its back. Spray some Fantastic spray cleaner in there and let is coat the entire surface for a couple of minutes and then hose it off with warm water from a hose or shower wand. Stand vertically and catch the runoff at the bottom with a bath towel. Use a hair dryer to dry it. If Fantastic doesn't work try Varsol.
Rob
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