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Simple to explain...See the first picture on Doug's post with the CRT still in the cabinet. The frosty appearence of the face of the CRT shows the condition..hence the dreaded cataract!
What is happening is that the bonding agent used to seal the safety glass face to the CRT itself is breaking down. This is most common on early color sets when the manufacturers went away from non-bonded glass fronts. Even on some early 70's sets this is still seen. RCA derived tubes/sealents are the worst! The Zenith type tubes create a greenish haze along the sides that may not take away from being able to view it under operation, as a different type of material was used.
On older sets dirt will accumilate between the two surfaces and affect the picture quality, and increased glare from sunlight/brightly lit rooms/reflections/etc. Bonding the face does make sense.
Come to think of it, black and white CRTS don't have this problem...hhmmm.
And Doug, I'm glad nothing happened to you! I've always thought of those 23EGP's to be nothing more than a black and white CRT with a color gun as Motorola's attempt to create a square crt!
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