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Erich,
That is a most unusual find! Some of the early color video projection sets used exactly that technolgy and they just placed a single refractive projection lens after the dichroic mirror combiner. The very first experimental RCA color (NTSC type) prototype circa 1950 is built like your Mitsubishi, but has 10" CRT's I think and was all vacuum tubes of course so it has a cabinet as large as a chest freezer.
How about posting some interior pictures of the guts?
Rob
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