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If those are liquid cooled tubes could there be mold or fungus growing in the coolant? I know that was a problem with some rear projection sets. It would cause a major loss in brightness for that tube. The solution was to empty the coolant, then clean the front of the tube and the lens, then replace the coolant with new fluid.
By the way when you search for the tubes try searching for PRT's as well as CRT's. This was to distinguish them from regular picture tubes.
Bill R
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