20 Apr
2005
20 Apr
'05
1:32 p.m.
From: "Vintage Computer Festival" <vcf at
siconic.com>
On Tue, 19 Apr 2005, Joe R. wrote:
Hi
I think most times, it is that the plastic pulls
away from the glass as the plasticizer evaporates.
There are issues of mold attacking but I don't
think this is the common failure that looks like
fern leaves.
I would suspect that one can protect a CRT that
one expected might have troubles by carefully sealing
the edges of the front shield with RTV.
One might consider a repair by placing the CRT in
a vacuum chamber such that their was some of that
windshield repair fluid in a small dam around the
edge. One would pump it out for at least one day
and then while under the vacuum pour the repair stuff
around it. Then release the vacuum and allow the
repair stuff to be pulled into the glass.
Not an easy process but it might work.
Dwight
Mine doesn't. I bought seven HP 64000s a
couple of years ago and none of
them had the problem. Their (the 64000s) CRTs were all made by Clinton but
they were still perfect. However they were stored on the second floor of a
large barn like building and it was bone dry. However it was un-air
conditioned and within site of the Atlantic coast. I don't know the history
of any of the other systems that I got except for the first HP9845. It had
been stored in a cheap leaky aluminium shed for a number of years and it's
CRT was full of spots. My Soroc came from a surplus store and it's CRT is
perfect but the store had just gotten it and I have no idea where it came
from before that.
My stuff has always been stored in dry areas with fairly stable
temperatures year round so who knows.
Another computer that gets affected that I just remembered is the Imlac.
My Imlac has it bad, and Tom Uban's has it as well.