4 Oct
2005
4 Oct
'05
5:39 p.m.
That's how I scrapped out VT100 tubes at DEC and elsewhere.
That's kind of a controlled failure since the suction pretty much is
controlled by the small input at the back of the neck.
An uncontrolled failure could be different. I've seen one old 1960
vintage tv blow up and the glass was retained by a plastic or glass
sheet across the black and white tube.
Never saw anything like a real accident, though.
Bill
Curt @ Atari Museum wrote:
I'll never seen anything horrendous in so far as
implosions. I used
to service Mac's "back in the day" and had to replace a few CRT's on
the original Macs. Apple would send the replacement monitor in a box
and inside was another box that you placed the whole mac inside of,
you'd follow the standard discharge and then purposely snap the tip of
the neck off the back of the monitor before closing up the box and
disposing of it, it was a scary moment the first time, but just a
quick zip of air and it was done, never had anything happen, did a few
dozen monitor replacements and disposals.
Curt
Jules Richardson wrote:
Tony Duell wrote:
At least one person here has used a thin wire to
cut the bonding,
then removed the front piece of glass, cleaned it up, and rebonded
it. It sounds like a dangerous project to me, not only because the
CRT could implode while you're cutting it, but also if you don't get
the bonding strong enough when you put it back together and the CRT
then subsequnectly implodes, the results would be very unpleasant.
That does beg the question of under what conditions a CRT implodes.
Do age-related implosions happen (or implosions for other reasons
other than mechanical shock)? I've never heard of a CRT imploding,
except for when physical damage has occured to it - but presumably it
does happen.
In other words what are the risks - or is it a case of
over-engineering in the first place to make sure (to a reasonable
extent) that there are no problems out in user-land?
Also curious as to the extent of the outward blast / debris field
(that sounds horribly technical but I can't think of a better
phrase!) when a CRT does implode. I'd *assume* glass just extends
outward a foot or two, but happy to be corrected there! (of course an
explosion would be a rather different matter)
Actually, is the faceplate actually there for dsamage limitation
reasons - or in fact there to help prevent implosion in the first
place from mechanical shock? I imagine that coupled with the sealant
layer it provides a reasonable damper if the CRT is dropped with
face-down.
Any people on the list involved (past or present)with CRT manufacture
who can provide more information?
cheers
Jules