Quote:
Originally Posted by compucat
If a picture tube loses vacuum in an empty cabinet, does anyone hear it hiss?
The biggest problem with rebuilding CRTs that have gone to air is that the phosphor degrades.
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It depends on what happens to the tube. If it develops a slow leak at a glass-to-metal seal (as with 15GP22 and 21AXP22 often,) you'll never know it. It can take years and years. I had one 15GP22 that was starting to lose vacuum, as evidenced by bright blue glow in the neck. Later the filament got brighter and brighter, then after about 2 years, it started arcing when enough vacuum had been lost.
In cases where the tube gets busted, either by a high voltage regulation problem (many Zeniths in the 70s, and in many newer projection sets,) you hear "Krack- HISSSSSSSSSsssssssssssssssss". If you snap the neck off, you hear "KSHTHWUPF" (Try to pronounce that
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Charles