An article written for potential fish-tankers states almost incidentally:
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TV tubes up until about 1960 do not have integral implosion protection. These can be extremely dangerous, because they can implode very violently. You'll notice a label on all tubes that are less volatile that says something like, "This tube provides integral implosion protection." If you don't see that, don't mess with it.
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This would eliminate from their consideration virtually all sets of any real interest or value to serious collectors.