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normende
Joined: 11 Feb 2019 Posts: 5
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Link Posted: Thu Feb 14, 2019 3:11 pm Post subject: Front glass on a CRT with coolant scratched |
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Hi,
While manipulating a Sony VPH-1044 CRT projector, one of the front glasses of the tubes cracked.
What I did was to carry the projector tilted 90º on my arms to be able to pass through a narrow door. Maybe the lens touched the glass applying a strong force on one side of it, and caused the crack. The coolant remains withing the chamber while the projector off. If I turn it on it starts dripping from the crack. It is a vertical crack in the middle of the glass which causes a very annoying effect on that particular color but anyway i can't use it like that because the coolant starts dripping..
The question is, can I replace this glass with any regular glass I can buy in any glass store?
Here in Argentina there are no spares for almost no vintage stuff, so no chances of getting an original glass from anywhere.
Thanks a lot in advance!
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Tim in Phoenix
Joined: 21 Oct 2006 Posts: 4379 Location: Phoenix
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Link Posted: Thu Feb 14, 2019 5:00 pm Post subject: |
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Yes
If you can have the shape and thickness of that glass duplicated. You might be left without the antireflective coating but you have few other options. Clean all surfaces of old adhesive and install your new glass, black RTV silicone is probably best. Allow 48 hours for RTV to cure. Put it in the sun to speed that up. Get fresh glycol if possible, and a big syringe to load it with.
Someone here might have a dead tube to send you.
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Curt Palme CRT Tech
Joined: 08 Mar 2006 Posts: 24305 Location: Langley, BC
TV/Projector: All of them!
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Link Posted: Thu Feb 14, 2019 6:19 pm Post subject: |
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Put up a separate post to see if anyone still has an 07MS tube left. I threw all mine out years ago, but that might be cheaper than getting new glass cut. As Tim says though, that's totally doable too.
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deronmoped
Joined: 03 Nov 2006 Posts: 1154 Location: San Diego
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Link Posted: Fri Feb 15, 2019 3:07 am Post subject: |
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I had some glass on some 6PG tubes crack for no apparent reason, they were just sitting in storage. Seemed really strange.
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normende
Joined: 11 Feb 2019 Posts: 5
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Link Posted: Fri Feb 15, 2019 1:05 pm Post subject: |
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Thanks!
I started a thread to see if anyone has a spare.
Curt it hurts to hear that you had a lot of them but not anymore
If nothing shows up I will have to go for the custom glass solution.
Do you have recommendations from now on related to why this happen and how to avoid it? Should I add some space between the optics and the tubes?
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CIR Engineering
Joined: 25 Aug 2008 Posts: 4264 Location: Chicago USA & Berlin Germany
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Link Posted: Fri Feb 15, 2019 6:45 pm Post subject: |
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Have you bled the coolant to see if it's under pressure? Over time water can slowly accumulate in the coolant and increase the pressure on the glass. This can cause cracks to happen randomly. You should probably pull the other two tubes and make sure there is no pressure by opening a filler screw. Also, put a small air bubble in there when you put the filler screw back.
craigr
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normende
Joined: 11 Feb 2019 Posts: 5
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Link Posted: Thu Apr 25, 2019 2:07 pm Post subject: |
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Hi all,
Thanks for all your tips.
Due to lack of time and also because I am a bit afraid of doing it I still haven't removed the cracked glass out from the CRT.
Just in case I would like to ask again if somebody has a glass and is willing to send it to Argentina. If not, is this a somehow special glass appart from the coating? Can I use any regular glass I can get in any glass shop used for windows or tables? We don't have spares here or special products so my options are limited to an extreme.
I really want to be able to use the projector again after sooo much work disassembling the lenses completely (which was a real nightmare) to take apart the 5 interior lenses and remove the water between them (it was not condensation, they were exposed to rain and sun for months). I still can't believe it works perfectly.
I was just able to watch one video and then boom... Taking it from one room to the other handling it tilted 90º to make it pass through a door it craked! :(
I wonder if the lens assembly was just too close to the glass and it cracked becaus the metal assembly pressed against the crt.
Thanks a lot!!
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Tim in Phoenix
Joined: 21 Oct 2006 Posts: 4379 Location: Phoenix
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Link Posted: Thu Apr 25, 2019 9:59 pm Post subject: |
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Any regular glass should do.
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garyfritz
Joined: 08 Apr 2006 Posts: 12026 Location: Fort Collins, CO
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Link Posted: Thu May 02, 2019 3:17 am Post subject: |
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normende wrote: | I wonder if the lens assembly was just too close to the glass and it cracked becaus the metal assembly pressed against the crt. |
I doubt it. There is usually room between the rear of an AC lens and the tube glass.
Maybe carrying the projector put some added stress on the glass, but most likely the glycol absorbed water and cracked the glass with internal pressure, like Craig said. It's not unusual for a tube to shoot a little geyser of glycol when you remove the filler screw. That's why he recommended leaving a little bubble of air in there -- if the pressure builds again, it can compress the bubble instead of pressing out on the glass.
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BruceR
Joined: 05 Nov 2018 Posts: 4 Location: Brisbane, Australia
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Link Posted: Sun Oct 06, 2019 6:00 am Post subject: Front glass on a CRT with coolant scratched |
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Hi, I'm in Australia, I've got a couple of dud SD187 tubes which use the same glass as an 07MS as far as I know. I've never tried, but I think you can separate the face glass from the rest of tube by cutting it away with a sharp knife. How to do that was covered on the site somewhere at one time. I can send one or both if you're prepared to pay the cost. In saying that, postage out of here is pretty expensive. It's been a while since I logged on. If you're still looking, let me know.
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alb_qwerti
Joined: 30 Sep 2008 Posts: 41 Location: Italy
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Link Posted: Sun Feb 11, 2024 10:38 am Post subject: |
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Hi all,
I reopen this old topic because I'm in the same situation.
I've bought a new refreshed VDC 180DVB22 for GB808.
It was cheap because the front glass broken during the transport. The glycol is still inside.
I thouht to change the glass using one of another one almost dead tube.
But I cannot take out the glass.
I removed the glycol and cut all the black silicone around but is still very strong to remove.
Do you have to heat up something ?
Thanks,
Alberto
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alb_qwerti
Joined: 30 Sep 2008 Posts: 41 Location: Italy
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Link Posted: Sat Feb 17, 2024 4:30 pm Post subject: |
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Nobody knows how to remove the front glass from an air cooled tube ??
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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alb_qwerti
Joined: 30 Sep 2008 Posts: 41 Location: Italy
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Link Posted: Sun Feb 18, 2024 9:00 am Post subject: |
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Ohh, a knife!
Thanks !!!!!!!!!
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alb_qwerti
Joined: 30 Sep 2008 Posts: 41 Location: Italy
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Link Posted: Sun Feb 18, 2024 11:01 am Post subject: |
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Anyway not an easy task with a 180DVB22.
The glass is not flush with the frame.
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Link Posted: Mon Feb 19, 2024 4:42 pm Post subject: |
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Not designed for easy service. You may try soaking the silicone in vinegar, That may soften it as well.
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alb_qwerti
Joined: 30 Sep 2008 Posts: 41 Location: Italy
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Link Posted: Mon Feb 19, 2024 7:08 pm Post subject: |
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Thanks !
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tschaeikaei
Joined: 08 Apr 2013 Posts: 489 Location: Germany/Saarland
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Link Posted: Wed Mar 06, 2024 7:39 am Post subject: |
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Hello, i have a full set of 07MS tubes with barco yokes (red and green in very good, blue in bad shape phosphorwise)
and a set of three very good 180DMB22 tubes from a marquee 8500 ultra.
Tubes are in Germany.
Regards, Julian
_________________ Marquee 9500U edgeblend P43 | NEC 9PG
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alb_qwerti
Joined: 30 Sep 2008 Posts: 41 Location: Italy
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Link Posted: Wed Mar 06, 2024 8:02 am Post subject: |
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Hi, I've just bought this tube, is a new VDC rebuild.
I want to try to change the glass before buy another tube.
Do you have a green P19LUG in pristine condition?
It is for my BG1209s/E.
Thanks.
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tschaeikaei
Joined: 08 Apr 2013 Posts: 489 Location: Germany/Saarland
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Link Posted: Wed Mar 06, 2024 8:42 am Post subject: |
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Hello,
no i don't have LUG tubes at all, just LCP tubes, but i wont sell these.
_________________ Marquee 9500U edgeblend P43 | NEC 9PG
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