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Definitely projection sets. Home projectors that I have worked on ran up to 35-40 kV on some of them. Some professional/theater CRT projectors ran 70 kV or even more.
Serious X-ray hazard on these things if shielding is disturbed or removed. Not only does the phosphor darken with age, but the faceplate glass itself browns from the radiation exposure just like a 6BK4.
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