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I know this is a bit offtopic for this particular forum, but while we're on the subject of rebuilding tubes... I've heard of people that had set up shop for rebuilding black and white tubes in their houses - from what I'd heard, it seemed simple enough, a car battery and some nichrome wire to cut the neck off the tube, replace the gun and reseal the tube, and pump the air back out. But what kind of pressures are required for a black and white tube? And I'm only referring to all-glass tubes here - the metal cone kind would have the same sorts of sealing problems. But just how low does the pressure need to be in order to have a serviceable B&W tube?
Another thing that confused me about tube rebuilds (B&W tube) - did they replace the phosphors or only the gun assembly? I always thought that the phosphors in black and white tubes degraded with use too. Kinda like the screen burn on computer terminals where something would get burned into the tube if left long enough, and occasionally you'd see a really well used terminal with 24 rows of 80 fuzzy little boxes from where the characters lined up. Wouldn't a black and white tube eventually get the same sort of phosphor degredation over the entire tube? Or does the relatively rapidly changing content on television prevent this?
Basically, there's a lot that I don't know about picture tube rebuilds... Any insight?
-Ian
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