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SGIforever
Joined: 06 Jul 2009
Posts: 66
Location: Sweden
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| Posted: Mon Sep 24, 2012 4:53 pm Post subject: Is it ok to store a crt projector in a cold place? |
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Hi,
I was thinking of storing some crt's in an unheated garage over the winter, but then I thought that it might not be a good idea.
Can the glycol freeze and damage tubes, lenses or anything else?
I'm in southern Sweden and it usually don't get very cold, but can go down to -20°C (4°F?) on rare occasions.
I know that use of glycol (maybe different type) in other applications is to prevent freezing and it depends on the mixing ratio.
The projectors in question are ECP4100 and Marquee 8000 so they are not LC.
/B
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Sep 24, 2012 5:08 pm Post subject: |
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A marqee 8110 manual says that sorage temperature should be between -30°C and +65°C
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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garyfritz
Joined: 08 Apr 2006
Posts: 12088
Location: Fort Collins, CO
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| Posted: Mon Sep 24, 2012 5:45 pm Post subject: |
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B, even an AC projector has glycol -- the glass behind your lenses is the front of a glycol chamber on the tube. It helps to cool the tube face.
I think they use pure glycol in projectors. 50% glycol has a freezing temp of -40°F/C, so you should have no problems. I don't think there are any other cold-sensitive components.
As with any electronics, be a little careful about bringing in from the cold into a warm/humid house. You can get a lot of condensation on the cold parts.
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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mc86
Joined: 20 Sep 2008
Posts: 767
Location: pittsburgh, pa
TV/Projector: ECP 4500 (Vidikron box), ECP4500+, wanting 07MS/07MTS, evaluating pc soft-blend
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| Posted: Wed Sep 26, 2012 1:38 pm Post subject: Re: Is it ok to store a crt projector in a cold place? |
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| SGIforever wrote: | Hi,
I was thinking of storing some crt's in an unheated garage over the winter, but then I thought that it might not be a good idea.
Can the glycol freeze and damage tubes, lenses or anything else?
I'm in southern Sweden and it usually don't get very cold, but can go down to -20°C (4°F?) on rare occasions.
I know that use of glycol (maybe different type) in other applications is to prevent freezing and it depends on the mixing ratio.
The projectors in question are ECP4100 and Marquee 8000 so they are not LC.
/B |
But they still have coolant behind the glass on the tube face...If that freezes and expands (the ones I tested in identifying the dyes used) had indecies of refraction that were no where close to pure EG, though I didn't do GC analysis to determine the mixture components. Anyway, if water is present and expansion occurs, I'm guessing one of three things could fail: the seal on the fill screw would leak, the silicone sealant would fail, OR the tube's face would implode. Otherwise, the pressure inside the air bubble in the tube would just pressurize a little and no big deal.
BTW, I have a set of 9 or better SD-187 tubes I've been trying to give away. They'd not be cheap to get to Sweden, however!
Just some thoughts.
Matt
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Wed Sep 26, 2012 1:55 pm Post subject: |
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| kal wrote: | Cold is not the issue, condensation is. If it's been in the cold, let it sit for many hours (even overnight) once inside before turning it on.
Kal |
Correct. What I do is let sets sit indoors with all the covers off for 24 hours, then I disable the HV section (pull the HV power supply), and let the set run idle for another 24 hours. Once in a while an HV lead goes bad, but usually there's no issue.
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SGIforever
Joined: 06 Jul 2009
Posts: 66
Location: Sweden
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| Posted: Fri Sep 28, 2012 3:35 pm Post subject: Re: Is it ok to store a crt projector in a cold place? |
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| gjaky wrote: | | A marqee 8110 manual says that sorage temperature should be between -30°C and +65°C |
Ahh ... reading the manual. That is not a bad idea 
| mc86 wrote: | | ... OR the tube's face would implode... |
This was the scenario I was thinking could happen but I feel safer after all your suggestions,
and I will not start them up until they have been in a warm enviroment for at least 24 hours.
| mc86 wrote: |
BTW, I have a set of 9 or better SD-187 tubes I've been trying to give away. They'd not be cheap to get to Sweden, however! |
I have noticed some masking on the tubes from the PJs original installation in a simulator.
I have three old Barco Data PJ's whoose tubes supposedly can be used in the ECP. At least that is what the guy who sold them to me said. Don't really know the condition of them.
Proper ECP tubes in good condition that wouldn't need modifiation is interesting. Shipping cost and current economy status make it impossible to think of though.
I might get back to you on the tubes when money situation is better and see if you still have them.
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