18 Apr
2005
18 Apr
'05
4:07 p.m.
On Mon, 2005-04-18 at 15:40 -0700, Vintage Computer Festival wrote:
The HP300 at the Computer History Museum has the same
"mold" effects, as
does a 2648 I've got in my warehouse. HP CRTs (especially the elongated
ones found on the mentioned machines) seem to be more typically
susceptible to this effect than other CRTs. I wonder what it is about
them?
Yep, I've not seen it on much else. Digico springs to mind, plus a
couple of others that we have whose names escape me right now - but it's
almost exclusively the HP stuff.
Could just be an age-related breakdown on the sealant stuff that for
some reason is almost unique to HP. Or I did wonder if it's some
strange reaction between the sealant and something else - maybe the glue
on the black tape that HP used around the fronts of their screens, or
something odd like that.
Actually, I wonder if most CRTs even have the faceplate like the HP
systems do? Once I removed the faceplate on this 250's display, it was
just like a regular CRT underneath. Maybe the reason it doesn't happen
to other systems is simply that they don't have this additional glass
panel over the CRT in the first place, and it was an HP addition that
isn't normally found elsewhere? I know that sounds silly, but I've never
paid *that* much attention to the front of CRTs on old systems, and the
ones I do remember seem just like normal TV-type CRTs...
cheers
Jules