On Fri, 19 Sep 2014, Tony Duell wrote:
we got a nice
squary blue tele-tec terminal but the screen is covered
with a lot of spots in the silicone between the safetyglass and the
tube. is there a way to fix that?
AS I understand it, the is due to the decay fo the bonding 'glue'
between the 2 layers of the CRT faceplate. The direct vision tubes (no
separate implosion guard) have a 2-panely faceplate like a car's
laminated windscreen. If the glass breks it will not fly everywhere.
I would eb very careful aobut follwoiugn maot of the instructions on the
web, which suggest removing nad discardign the outer glass panel. You
would nto get me to sit in front of a CRT to which that had been done
(my father spent most of his life workign on high vacuum systmes and
knew what an implosiong could be like!). IMHO rmeovign the outer glass
layer is as irresponsible as removign a safety earth connection or
shorting otu a fusholder. More irresponsibel in many ways since a CRT
can implode when the device is not powered up.
I have never had to do this (although I have got soem CRTs that need
doing). I think I would want ot remvoe the outer glas layer intact and
re=bond it, possibly withaht that UV-curign adhesive used for bonding
lens elements.
Oh yes, do not scratch the inner CRT glass. No matter what is said about
polishing out hte scratches. They are still potential weaknesses,
possible cuases of an implosion.
Thank you for mentioning this. The "instructions" in the link mentioned
earlier in this thread which suggested breaking and prying off parts of
the outer glass and such with a screwdriver made me cringe. I guess it is
true...anyone can publish anything on the web.