Re: Happy Fun Band...

The band is there for implosion prevention. It is probably installed before the
tube is evacuated. It is meant to keep the glass under tension, probably to
counteract the stress caused by a fairly flat faceplate responding to external
air pressure versus internal vacuum.

As a secondary function, the band on some tubes has mounting ears.

James Nelson wrote:

> I don't want to ressurect a bad topic, but I don't buy the thing about the
> band around the tube being critical anyway. Do you suppose they blow the
> tube with the band in place? NO. I think if you try to take it off, you'll
> probably accidentally cause stress somewhere and OOPS! That's all. Doesn't
> matter either way. It's like arguing over predestination... it doesn't
> change the fact that you do what you should do and don't do what you
> shouldn't. :-) my 1/2 cents.
> James
>
> ----- Original Message -----
> From: David Shuman <dshuman@mindspring.com>
> To: <vectorlist@lists.cc.utexas.edu>
> Sent: Thursday, December 09, 1999 6:12 PM
> Subject: Re: Happy Fun Band...
>
> > Doug Jefferys wrote:
> > > ...I actually got a little curious as to the metal rim band of a CRT and
> > > did some poking around on USENET. As a matter of fact, a few people
> > > *have* removed it while the tube was under vacuum and lived to tell
> > > about it, but only barely:
> > > In a nutshell, taunting happy fun band results in an almost immediate
> > > implosion.
> >
> > I had an incident a few years ago in which a Space Fury (sold to me by
> > Duncan Brown; note this is clearly on-topic for vectorlist) tipped over...
> > the plywood frame around the monitor got crunched, and the CRT slipped out
> > of its band. (The bolts holding the CRT to the frame were attached to the
> > band.)
> >
> > The CRT didn't implode--sounds like I got lucky! I never was able to get
> > that band back on, though.
> >
> > --
> > Dave
> >
> >

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