Quote:
Originally Posted by andy
I never said the bonded safety glass had anything to do with preventing stress on the CRT. All it does is provide a layer of protection for the CRT (in case something strikes, or scratches the screen), and it helps contain the flying glass if it does implode for some reason. I hope Hawkeye wasn't sending back rebuilt 21FJP22s with missing safety glass and no tension band unless they customer asked him to turn it into a 21FBP22.
Using a CRT with the bonded safety glass removed is fine as long as there is a separate safety glass installed (either flat like 50's sets, or curved like most 21FBP22 sets). Using a CRT with no implosion protection is dangerous and should be avoided.
There's a reason every TV ever made (over about 5") has either had a safety glass, or tension band. Using a TV with no implosion protection is like driving without a seat belt. Everything is fine until something bad happens. Unfortunately, you never know when or where a disaster will happen.
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AFAIK no roundies had implosion (tension) bands. Any banding, I think, was for mounting only, and not for pre-compressing the faceplate, which is what the true implosion band does. So, impact protection was supplied a separate flat glass or later in some tubes by the bonded faceplate
My rebuilt 21FJP22 from Scotty definitely does not include a bonded faceplate, but it is behind the flat glass on the CTC-5, so it's protected just as much as a 21AXP22 (metal) or more relevant, the same as a 21CYP22 (glass) that was used as a later replacement.