Quote:
Originally Posted by tausifs with the technology now rendered obsolete as a result of EU law, wouldn't replacement tubes be a thing of the past pretty soon, so any pj would be on its last legs. |
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