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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Oct 03, 2009 2:56 pm Post subject: 210,000 hour CRT PJ |
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I found this post over on the Euro AVforums quite interesting.....
| TVrepairman000 wrote: | Average optimal performace lifetime of a TV CRT is rated at 20000 hours at optimum emmisons that's a long long time even if on for 5 - 6 hours a day.
even after the 20000 hours the tube does not simply stop working, the electron emmisions from the cahtodes might / may start to tail off a bit and the colour may drift as a result but you can bet that it is still very watchable and can be tweeked, if it needs tweeking at all, generally not an issue as this happens evenly to all 3 electron guns unless you have a dodgy tube.
My nan has a 21 inch Sony manual tune Valve TV its wooden cabinet made around 1965 and its still going to this day and apart from me fitting quite a few new capacitors and the odd valve over the years the picture tube is still as good as the day it was made, plenty of emmisons on my tube tester, very nice vintage TV in daily use.
Projector tubes suffer from burn in due to very hight brightness output needed and this heats up the phosphor inside, over time due to the heat the used phosphor starts to darken in colour and emmit less light output, and that changes the colour of the image displayed but the tube still works unless the cathode has totaly stopped emmiting electrons.
I was given a while back a Grundig rear projection TV from 1983, (this was adapted into a front projection unit and mounded to a ceiling in a pub) it was on 24 - 7 - 365 from about 1984 - 2008, 24 years non stop (eurosport on analogue satellite) never turned off or put into standby (apart from for repair power out ), had a few triplers over the years and caps in the power supply, we worked out that it was on for 210,000 hours ish, the 3 tubes were almost burnt black, but it still projected an image (all be it a pretty poor one) after 210,000 hours, now that's darn good going, I do have pictures of it and its tubes I will upload as proof.
CRT's will be around for a very very long time, just as it is a reliable solid technology thats had the best part of 80 years of refinment, I have a CRT TV and intend to keep unit it fails, been going 11 years, bet you bottom doller whe it does pack up it will not be the CRT its self but some other component that can be replaced no problem + I prefer CRT picture to the blocky picture found on LCD / Plasma display because there are only a small number of colour combinations, on CRT its 0 off black though an infinate number of values to fully on white, digital its down to a palette of 16.8 million colors due to digital processing restriction. 256Red x 256Green x 256Blue = 16.8M
All hail the almighty CRT |
I can't wait till he posts pics.
So what the most hours on any based CRT you techs or anyone for that matter you've come across or experienced.
I had a small 20 inch CRT zenith in my office that was on at least 14 hours a day every day for 13 years, that comes out to
71540 hours, I could have fixed it as the convergence was going out on it and some color changes(probably a good degaussing would have done the trick) but i wanted to get a CRT HDT 27 inch Sammy for the office.
Athanasios
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Last edited by Nashou66 on Sat Oct 03, 2009 6:58 pm; edited 1 time in total
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sat Oct 03, 2009 5:42 pm Post subject: |
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He'll probably be posting a picture of a AmPro 4600HD 
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Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Sat Oct 03, 2009 6:18 pm Post subject: |
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| stefuel wrote: | | He'll probably be posting a picture of a AmPro 4600HD |
Yea.....I was going to say.....you must be around those hours by now Chip...... 
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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: Sat Oct 03, 2009 6:25 pm Post subject: |
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I've had a bunch over 50K hours, Barcos and E'homes, the highest chassis I've ever had is on the front page of the FAQ, 68,000 hours. I retubed it, redid some caps, and sold it.
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Sat Oct 03, 2009 8:24 pm Post subject: |
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| macgyver655 wrote: | | stefuel wrote: | | He'll probably be posting a picture of a AmPro 4600HD |
Yea.....I was going to say.....you must be around those hours by now Chip...... |
Sheeit. it's running right now on HD theater. the Mecum muscle car autions are on and no one is watching it. I occasionally walk in to see a gleaming 67 red 427 vette and begin to drool. 
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Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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Sparky015
Joined: 12 May 2009
Posts: 1185
Location: Cleveland / Akron, OH
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| Posted: Sat Oct 03, 2009 10:10 pm Post subject: |
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I doublt you can get much higher than this. This would make the pj the first ever piece of electronics every built.  These were the hours on my 8500 I picked up from a university auction. Ultimately I found the memory to be corrupted, so actual hours are unknown.
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perisoft
Joined: 29 Aug 2007
Posts: 2920
Location: Ithaca, NY
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| Posted: Sun Oct 04, 2009 2:09 am Post subject: Re: 210,000 hour CRT PJ |
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| TVrepairman000 wrote: | I prefer CRT picture to the blocky picture found on LCD / Plasma display because there are only a small number of colour combinations, on CRT its 0 off black though an infinate number of values to fully on white, digital its down to a palette of 16.8 million colors due to digital processing restriction. 256Red x 256Green x 256Blue = 16.8M
All hail the almighty CRT[/i] |
Oh my god... this guy works with displays for a living? I'd hate to be one of his customers... 
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