Re: On buying a new CRT these days...
Re: On buying a new CRT these days...
- Subject: Re: On buying a new CRT these days...
- From: Pete Gamby/mekocert<email@hidden>
- Date: Thu, 23 Oct 2003 15:34:03 +0100
Re the gun vs phosphor aging issue
The 2070SB uses a new/updated gun to achieve the higher brightness (it has
a reduced cathode element size if I recall correctly) but runs at the same
cathode drive voltage as previous generations.
Orginally the Diamontron M2 tube was specced to have a peak white spot
brightness of 450cd/m2 (compared to 135cd/m2 on the conventional tube).
This was later reduced to 300cd/m2 for the commercial product
As well as boosting brightness, the new gun includes a revised control grid
enabling better focus at the higher brightness levels
As far as we know, the tube does not have a shorter/lower lifetime spec
than the conventional Diamondtron tubes due to the higher brightness
capability
For information, Mitsubishi has just shown a new wide gamut 22 inch CRT
monitor at CEATEC in Japan - they claim 93 percent of NTSC - so we'd expect
them to stick in the CRT biz for some time to come. Especially now that
Sony has given up.
Regards, Pete
Editor - Display Monitor
Meko Ltd
http://www.meko.co.uk
* Covering the World of PC Display Systems *
=========================================================
There are two factors in CRT aging. One is phosphor degrade. Since the
phosphors will fade no matter what, and will fade faster at higher
luminance,
manufacturers are reluctant to put long life guns into monitors... on the
theory
that its a waste of money, since the screens will fade anyway. But its is
usually
gun drop off that actually ends up limiting older CRTs more than phosphor
fading... rather a chicken and edd situation. Your monitor may have more
powerful
guns with a longer life expectancy, so they may reduce the gun issue, but
if
they are brighter than usual, they will still wear faster, and will
definately
fade the phosphors faster...
One solution is to get a monitor with long life, high powered guns, and
resist running it at higher luminance, and turning it off or blacking it
out
when
not actually using it(warm up times for CRTs make this a bit awkward...).
This
will allow you to get all that you can out of your phosphor life. But as
you
say, CRTs are so affordable these days, that I would be more worried about
whether I could still get a similar replacement in a year or two than the
cost
of
the unit.
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