Cataracts repair gone wrong........

[Dave A]

I wonder if putting a farm water trough heater in the pool would help by warming the water?

[leadlike]

I like Carmine's suggestion of using solvents like Lacquer thinner or MEK to dissolve the PVA goop. I would also give acetone a try. As I have never had to handle a CRT with a face like this, is the face plate itself made from glass, or is it plastic? If it is anything other than glass, those solvents may also dissolve it as well...

[eberts]

The 23EGP22 was the first mass produced rectangular tube made by a tube company called National Video.
The first ones were sulfide screens.
Later batches used rare earth.
It was the most dangerous and stupid tube designed, based on costs and profitability, with no regard to consumer safety.
At the time, just making a rect tube was like landing a man on the moon.
The tubes were very unstable. At the time, the technology just wasn't there, no computers, just draftsmen in a room, saying "Oh yea, that looks good."
Many engineers were very closed minded too.

Look at an old TV, You have a high wattage, high temperature, high voltage generating mess with a potential bomb all enclosed in a real wood highly combustible box. Almost like an automobile.

You guys should use an infra red heater to remove an RCA type safety glass, and use a piano wire to slice the gooey Zenith type plates off. You can clean up a Zenith mess with paste paint remover.

The tubes should be warm. Wear eye protection.

Never, ever remove a tensioned band.

[julianburke]

Two things here, the tube itself was not banded and it had a scratch in it somewhere. The faceplate has to be heated uniformly and completely-not spotty with a heatgun. You got one area too hot and it couldn't expand uniformly. Also, NEVER EVER EVER remove a pressure band from a live tube either or the same result will happen.

We used a infrared heater that covered the entire faceplate. The tube should be a little warmer than room temperature to start with.

[Red October]

OK I'm curious; I've got to admit. Once the safety glass is off such a set, what is done? Is it re-sealed? Is the safety glass simply omitted? Is some sort of protector installed? I have a big RCA (currently waiting for a CTC-131 Chassis...) with a piece of plate glass over the tube, and I've seen other sets with this before. Is this a safety glass or is it just to protect the surface of the tube? Note that the flat glass panels I speak of are factory items.

[radotvguy]

Doug, the same exact thing happen to me . I was attempting to remove a safety glass from a color tube and the crt imploded right in front of me on my work bench . Lucky for me i was wearing safety glasses . I had a piece of glass fly into my arm and slightly cut me , but i was ok . It really scared the hell out of me and i never would attempt it again. Can be very dangerous . I either buy another crt or throw out the tv , wont dare to try the catarac removal procedure again .

[andy]

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[newhallone]

More likely to save one knowing they can be fixed!

[bgadow]

I trashed many a crt with cataracts before reading the "how-to" here on AK!

[eberts]

Originally Posted by Red October

I have a big RCA (currently waiting for a CTC-131 Chassis...) with a piece of plate glass over the tube, and I've seen other sets with this before. Is this a safety glass or is it just to protect the surface of the tube? Note that the flat glass panels I speak of are factory items.

The old sets with flat plates of glass are tinted and tempered.
They were pretty strong and thick. I would throw some in a dumpster, they would not break unless smacked hard with a hammer.
The glass bonded to old tubes with resin are thin, crack easily, most are treated on the outside to be dull looking, not shine, most were tinted dark.
The next version used glass that was not tinted, designed to reduce x-ray exposure, and let more brightness through, mostly used on black matrix tubes.

[jshorva65]

Doug and Mike, glad to hear you're both OK! Wow, scary stuff! My condolences on the loss of the tubes, too. FedEx killed a client's double-boxed 7DP4 on its way to me last year, so the loss of a tube is bad enough in and of itself. I'm not equipped to do cataract surgery, so I haven't tried yet. Now, I'm wondering if I ever will. I'll probably just let the seasoned pros at that kind of work take care of any cataracts I encounter, although the kiddie pool idea sounds much safer than a heat gun. If I do attempt a cataract fix, I'd probably use the slow-and-steady water method with the setup locked safely in a garage.

[RCAkid]

This may be a obvious question, but I am a bit confused as to the tension band VS a mounting band.

I have replaced round and rectangular CRT's but have only experienced a band which holds the mounting ears on. This band was basically a huge clamp with a tightening screw on it. I never wanted to tighten it too much for fear of putting too much stress on the CRT. This is especially true of a
25AXP22.

I would appreciate it if someone could explain the difference between these type of bands. Wouldn't you have to remove this to transfer the mounts to a new CRT?

Thanks!

[andy]

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[steerpike2]

I saved this off the web a while ago: I don't recall the original source.

Anyway, a friend of mine decided to cut the rimband off a picture tube. I wasn't there, he told me about it. This was a 25" RCA tube he wanted to fit into a Zenith TV (don't ask me why). What happened in the next few seconds after he cut the rimband, the picture tube imploded in his face, embedding the neck and yoke assembly in the ceiling, he came out with a cut about half an inch above his right eye that needed 6 stitches to close. Had that shard of glass been half an inch lower, he would be wearing an eye patch or have a glass eye for the rest of his life.

[bgadow]

I've heard of at least a half-dozen instances of this happening. Plenty of folks tried it; not sure if anyone ever did it successfully. I did install a tension band tube in a set that used a bonded tube; it was a tight fit but it worked. As long as you leave it intact you are A.O.K.