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Tom-
The colors and geometry look fantastic on your 21GUP22, but I don't know if is a black-matrix CRT. I thought that term referred to the areas between the phosphor dots being black or very dark, or another method of making the screen appear dark, but a brief Google search returns descriptions of the internal construction of the shadow mask or other parts, so now I can't say how to find out. One benefit is supposed to be better contrast in a bright room.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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