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Old 01-24-2017, 05:55 PM
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RCA cataract removal

I'm doing an experiment on RCA cataract removal. I took the 25XP22 out of my CTC-40 tonight and replaced it with a Sylvania 23VAJP22 rebuilt tube. It looks really good in the set. I put the cataracted tube in the bathtub with water. I've seen videos where people put them in water, and after a while, the cataract fell right off. I'll report back with my findings.
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Last edited by TUD1; 06-19-2018 at 03:55 PM.
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Old 01-24-2017, 06:29 PM
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YMMV...Mine sure did! I had the same tube out of a CTC-25 it sat in water for about 2-3 months. All that happened was the mounting hardware rusted.
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Old 01-24-2017, 06:38 PM
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I have no idea what YMMV means. I had to use the mounting hardware to mount the Sylvania CRT, so no problem there.
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Old 01-24-2017, 07:05 PM
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YMMV=Your Mileage May Vary.....Google is good for acronyms and text message style gibberish.

The water never did a thing to loosen the glue on mine....All it did was invade where the glue had always been bad...
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Old 01-24-2017, 07:13 PM
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Interesting. In the video I watched, the entire piece of PVA came off in a big sheet even where it had not delaminated yet. Maybe you didn't let it sit long enough. It was an RCA tube identical to mine.
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Old 01-24-2017, 07:14 PM
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How did you get a 23" picture tube to fit into a 25" TV?
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Old 01-24-2017, 07:15 PM
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25XP22 is a 23" tube.
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Old 01-24-2017, 07:20 PM
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Quote:
Originally Posted by TUD1 View Post
25XP22 is a 23" tube.
I thought the first two digits of the picture tube number indicated the size of the tube? e.g. 25xxxxx meant it was a 25" picture tube and 23xxxxx meant it was a 23" picture tube and 19xxxxxx meant it was a 19" picture tube.
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Old 01-24-2017, 07:39 PM
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That's correct. Before ~1970, manufacturers lied about the size. The government made them tell the truth.
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Old 01-24-2017, 07:39 PM
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In about 1970 or so the Federal Trade Commission came up with a ruling that said the advertised size must match the VIEWABLE part of the picture tube and not the overall diagonal measurement of the face. This cut down the size of a 25" to 23". After the change 25xxxx became 23Vxxx. Later, bigger tubes came out that were 25Vxxx. The "V" is the key!

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Old 01-24-2017, 07:44 PM
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The PVA (adhesive) seamed to vary a lot, and I guess it's condition after all these years matters, too. I first discovered water would work when I dug out an old RCA round tube that I'd left sitting out in the woods for a number of years. The PVA had turned to jelly. I did one in a kiddie pool and it worked after 2-3 weeks, though still took some prodding. Others haven't responded nearly so well, especially the green type used by Zenith and others.
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Old 01-24-2017, 07:45 PM
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23V=25" tube. You have a 23VAJP22, never seen a 23AJP22, just the 23VAJP22 and a 25AJP22.....

23VAL/VATP22 were standard tubes in the 80s to replace the 25AP/XP22 CRTs.
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Old 01-24-2017, 07:48 PM
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By current FTC standards a 25XP22 is a 23 inch crt as in 23VAJP22. The "V" is to show current standard of viewable area. All the best, Tom.J
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Old 01-24-2017, 08:47 PM
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IIRC the government put the viewable area law in place in 1968.

I've put that tube in for the longest time I'd heard used. It belonged to a client so I could only wait so long.

Zenith CRTs can be done cool, safe, and reliably by cutting the soft glue with a guitar string....I'll take a dozen Zenith cat removal jobs over one RCA any day.
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Last edited by Electronic M; 01-24-2017 at 08:55 PM.
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Old 01-24-2017, 10:38 PM
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Is the screen cover usually glass or plastic on these sets? I've honestly never seen one in person. I know they're bonded with clear... adhesive or whatever, but that's it lol
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