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Subject: Re: CRT decay
Author: classiccmp_at_u.washington.edu at internet
Date: 11/2/98 3:19 PM
On Mon, 2 Nov 1998, William Donzelli wrote:
> > Yes, "getter" is the word.
>
> Spefically, the getter is the wierd looking bit of metal that is near the
> silverly coating on the tube, whose job is to get the residual and trapped
> gas during manufacture. The keeper is the actual silvery coating, whose
> job is to keep the oxygen in a state so it can not get rereleased.
>
>>Is this related to what I am about to ask? Could somebody do a short
>>summary of why Fimi(?) greyscale megapixel NeXT monitors fade after
>>20,000 or so hours of use and indicate whether there are any other
>>monitors (perhaps some classic) that show similar problems?
Neither the getter nor the phosphor should have anything at all to do
with fading. The culprit is probably a weak cathode on the electron
gun. The cathode isn't boiling off enough electrons to 'paint' the
phosphor to the intensity needed. There used to be boosters available
for older tv sets to goose additional life out of weak crt's. I've
never heard of it in this case. Also, you can have old crt's rebuilt
with new electron guns but this is VERY expensive. I would search for
a replacement tube first.
Marty
-- Stephen Dauphin
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From: Stephen Dauphin <ai705_at_osfn.org>
To: "Discussion re-collecting of classic computers"
<classiccmp_at_u.washington.edu>
Subject: Re: CRT decay
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