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The tube you are describing is not the modern one, but one invented by John Logie Baird before WWII. It had the guns off at three very different angles. This would work with a screen made up of pyramids (half cubes). He proposed a variation that used a two sided transparent screen with two colors on a ridged surface on one side and the third color on the back. Either way, the mini-pyramids or ridges have different sides that are each illuminated only by one gun. No shadow mask needed, but the keystone correction would be horrendous. Here is a sketch from "Elements of Television Systems", George. E. Anner, Prentice Hall, 1951. I know I have seen a photo of an experimental tube with widely spaced guns, but can't put my hands on it right now
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