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I suspect he real reason it was changed is the insulator used for the metal tube had a very bad habit of breaking down and would start arcing at some very inconvenient time. My parents had an early RCA color set with a metal tube. It was a regular occurrence that it would start arcing on Friday night, making the set useless for the weekend. On Monday, RCA Service was called and on Tuesday or Wednesday, the service tech would arrive. As a kid, I got on a first name basis with him. He came that often. He'd change the insulator and all would be OK for a couple of months, then the problem would return. Eventually, they changed the CRT for a new all glass version. After that, we had very few problems with the set.
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