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An easy way to tell how much use the CRTs have had is to remove the lenses and look at how much phosphor burn there is. A new CRT will all be the same color, but an old one will have a brown area where the raster is. If there's only a small amount of burn in, the CRTs should have a lot of life left. These old front projectors seem to be very easy on CRTs. I've seen well used ones that still put out a good picrure after cleaning and adjustment.
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