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The 19AP4C is supposed to be aluminized, and that's the only metal CRT
that I know of. I did pose that question to an older gent at Clinton years back. He told me that the phosphor required a protective laquer
coating to protect it during the aluminization process. But, due to the tight corner created by the bonded faceplate, the laquer was difficult to remove entirely during final evacuation. I did want him to aluminize a 16GP4 for me,
and he said he would give it his best shot. I would only get charged if it
was successful. But, that was right when Clinton went to new ownership,
and the new owners said no to all metal tubes.
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