Return to the CurtPalme.com main site CurtPalme.com Home Theater Forum
A forum with a sense of fun and community for Home Theater enthusiasts!
Products for Sale ] [ FAQ: Hooking it all up ] [ CRT Primer/FAQ ] [ Best/Worst CRT Projectors List ] [ Setup Tips & Manuals ] [ Advanced Procedures ] [ Newsletters ]

 
Forum FAQForum FAQ   SearchSearch   MemberlistMemberlist  Photo AlbumsPhoto Albums  RegisterRegister 
 MembershipClub Membership   ProfileProfile   Private MessagesPrivate Messages   Log inLog in 
Blu-ray disc release list and must-have titles. Buy the latest and best Blu-ray titles to show off in your home theater!

Front glass on a CRT with coolant scratched

 
Post new topic   Reply to topic   Printer-friendly view    CurtPalme.com Forum Index -> CRT Projectors
View previous topic :: View next topic  
Author Message
normende



Joined: 11 Feb 2019
Posts: 5



PostLink    Posted: Thu Feb 14, 2019 3:11 pm    Post subject: Front glass on a CRT with coolant scratched Reply with quote


        Register to remove this ad. It's free!
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 90 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!
Back to top
Tim in Phoenix



Joined: 21 Oct 2006
Posts: 4226
Location: Phoenix


PostLink    Posted: Thu Feb 14, 2019 5:00 pm    Post subject: Reply with quote

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.
Back to top
Curt Palme
CRT Tech


Joined: 08 Mar 2006
Posts: 23729
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Thu Feb 14, 2019 6:19 pm    Post subject: Reply with quote

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.
Back to top
deronmoped



Joined: 03 Nov 2006
Posts: 1153
Location: San Diego


PostLink    Posted: Fri Feb 15, 2019 3:07 am    Post subject: Reply with quote

I had some glass on some 6PG tubes crack for no apparent reason, they were just sitting in storage. Seemed really strange.
Back to top
normende



Joined: 11 Feb 2019
Posts: 5



PostLink    Posted: Fri Feb 15, 2019 1:05 pm    Post subject: Reply with quote

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 Smile

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?
Back to top
CIR Engineering



Joined: 25 Aug 2008
Posts: 3886
Location: Chicago USA & Berlin Germany


PostLink    Posted: Fri Feb 15, 2019 6:45 pm    Post subject: Reply with quote

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

_________________
JETI Specbos 1211 Spectroradiometer
Photo Research PR-650 Spectroradiometer
Klein K10-A Laboratory Grade Colorimeter
Murideo Fresco SIX-G HDMI 2.x Multimedia Generator
Murideo Fresco SIX-A HDMI 2.x Analyzer
*NEW Light Illusion LightSpace XPT Pro Version 10.x Color Calibration Software
ChromaPure3 Pro Color Calibration Software
Sencore CR7000 CRT Tube Analyzer / Rejuvenater
Audyssey MultEQ Pro Audio Calibration System
Authorized Dealer for Lumagen & just about everything else Wink
www.CIR-Engineering.com - craigr@cir-engineering.com
Phone: 865-405-6892
Back to top
normende



Joined: 11 Feb 2019
Posts: 5



PostLink    Posted: Thu Apr 25, 2019 2:07 pm    Post subject: Reply with quote

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 90 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!!
Back to top
Tim in Phoenix



Joined: 21 Oct 2006
Posts: 4226
Location: Phoenix


PostLink    Posted: Thu Apr 25, 2019 9:59 pm    Post subject: Reply with quote

Any regular glass should do.
Back to top
garyfritz



Joined: 08 Apr 2006
Posts: 10627
Location: Fort Collins, CO


PostLink    Posted: Thu May 02, 2019 3:17 am    Post subject: Reply with quote

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.
Back to top
BruceR



Joined: 05 Nov 2018
Posts: 3
Location: Brisbane, Australia


PostLink    Posted: Sun Oct 06, 2019 6:00 am    Post subject: Front glass on a CRT with coolant scratched Reply with quote

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.
Back to top
Display posts from previous:   
Post new topic   Reply to topic   Printer-friendly view    CurtPalme.com Forum Index -> CRT Projectors All times are GMT
Page 1 of 1
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum