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IIRC cathode requirements of larger CRTs are more stringent. I think it has something to due with current per square inch to achieve a certain brightness... If they used the same guns that were in the original 12" in all sizes up until that point I can see those guns probably being decent in a 19" set, but 26" could have been a bridge too far that required a cathode emisive surface redesign that was unforeseen.
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