Re: Does the cooling fan protect slides in projection?

[P3D bob wier <wier@xxxxxxxxxxxxxxx>]

|
|I think you haven't been challenged yet because you are right. I came to
|the same conclusion a few days ago. As to the equilbrium point, you should

An additional function of the fan is to keep the lamps from coming apart.
Not only will the glass melt/crack if too hot, but there is a problem in
some types of lamps where the the glue/solder etc holding the pins onto
the base will melt, which can result in a nasty short.

A similar problem exists in high power tube based radio transmitters, even though there is only incidental light produced. I've seen some pretty
amazing melted tubes (BIG tubes!) when the cooling system failed in a
TV/Radio transmitter, making jelly out of 25,000 watt triode!

Back at my last school, they had an EIMAC all metal "tube" which was
victim of a cooling failure. It was pretty small, only 5,000 watts, but
the metal had deformed to the point that it was no longer circular, and
the handles on the top had drooped down to the point of touching the
body of the tube (where there had been a couple of inches previously).
I sure coveted that tube, but couldn't ever get the electronics shop
guy to give it to me :-(

--BW

    ====== wier@xxxxxxxxxxxxxxx ======
  Friday, December 6, 1996 12:46 AM
  Texas A & M University - Commerce
   keeper of the Photo-3d, Motorola
 MC68HC11, Overland-Trails, LDS State
Research Outline Guides and other stuff
 



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