26 Oct
2011
26 Oct
'11
1:31 p.m.
On Tue, 25 Oct 2011, Tony Duell wrote:
I haven't seen any metal band (I know what band you mean) on those CRTs
here with "screen rot". The faceplate is just glued in front of the actual
How is the CRT mounted? In the HP machiens I've worked on (which would be
similar, I think, to the ones we're discuessing -- things like the 9836A,
9836C (colour CRT), 2623 terminal, 9845B, etc), there is a tension band
and it carries the mounting lugs for the CRT. I've had the CRts out...
I was
referring to holding the faceplate on the CRT, not supporting the CRT=
. I plan to replace the metal band, padding with e.g. strapping tape if ne=
cessary. Does that make more sense? - Ian
It wworries me, I can tell you that. That metal band is fixed ot the
glass, it's also deliverately very tight. Somehow it supports the screen
glass during an implosion, protectggn the viewer. It's not just a mouting
band for the CRT. picture tube, and there's a considerable gap
between the two (around
0.5-1cm) at the outer edges that is filled with said filler/glue. I've
only seen some kind of thin (and thus quite weak) adhesive tape around the
border. But I'm only speaking of the CRTs in HP terminals and some other
mid-80s computer monitors (e.g. one from a BASIS-108, containing a Philips
CRT).
I think that normally the tension band goes on the inner glass (the
actual CRT envelope), the seocnd facepalte is then bonded to the screen
area. It shouldn't be necessary to disturb the tension band, should it?
-tony