Quote:
Originally Posted by colorfixer
Notice that the red dots are slightly larger than the green and blue? Remember that the red phosphor at the time was less efficient than those used for green and blue. It's known that the red gun was run harder to compensate for this, perhaps they also made the dots slightly larger to help as well?
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In these tubes, like all the early tubes, the size of the excited area was limited by the size of the holes in shadow mask ("positive guard band"). What you suggest could not be done until black matrix, negative guard band tubes were developed, in which the mask holes are larger than the visible area of the phosphor dots; and then it was not done, as far as I know.