A few things about your YT video.
The appearance of the horizontal output tube, you can't judge a tube's life based on the appearance of the flashed getter spot alone, it can often be very misleading.
https://tubesound.com/brown-or-black...not-mean-used/
The tube in the shielded area in front of the HV box, the spec often is that they can be mounted in any position, and often are :p They tend to radiate outward in a circular pattern from the bottom, so an open top is minimal x-ray risk.
Broken CRT cap / socket guide, this is very VERY common with these type tubes, and the bane of their existence, I need 2 myself, if someone could find a way to make them, they could make a good deal of $$$ :O
But the most disturbing thing was the broken convergence coil, with the wire jus hanging out like that, the plastic on it just deteriorated? O_o