Quote:
Originally Posted by Jeffhs
I once had a Majestic TV (1951 model) which had a round 16GP4 CRT (metal cone). Never had one bit of trouble with the tube losing vacuum or anything else. Also, I did not realize that round CRTs had seams anywhere in or on them; in fact, I don't recall seeing a seam anywhere on the 16GP4 in my set. (I learn something new all the time reading the posts in these forums.)
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The metal cone tubes have a seam where the glass face is bonded to the metal cone, they also have a seam where the neck is joined to the other end of the cone.
That said I have a 50+ year old 16AP4 that is still holding vacuum as was the worn out tube it replaced.
I think the bigger tubes (19", 24" 30") probably had more problems because of the larger joint surface and the extra expansion contraction problems.
The metal tubes don't hold a charge on their own but I guess you could still get shocked with the set off if the doorknob cap was charged up.