Read on this and recall it is impossible. It's a vacuum, so there is no air or gaseous material inside to expand and burst the glass vessel. If anything it would have to implode but that would require a set of circumstances outside the tube that would not (or cannot) exist under ordinary conditions.
The biggest danger with tubes is you drop it and cut yourself on broken glass or breath in dust from heavy metals they use on the internals. I believe some older DHT's also could contain Thorium, which is radioactive.
I've never experienced a tube explode in over 60 yrs of using them. The only time they have catastrophic failure of the glass is when dropped, struck with a solid object such as a hammer, or thermally shocked like pouring ice water over a hot tube. As the wise men say, don't do that.
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