solo - 30-6-2007 at 20:01
I recently took apart an old IMac computer and salvaged all I could use, one thing I noticed that after breaking the cathode tube ..... there is a
neat fine sieve screen inside that is useful , but more to the point the cathod glass tube is very thick and can be used for a reaction vessel.....I
bet it will hold a good amount of pressure.........I will take one apart carefully and remove the gas material safely as well as the screen that's
inside for other uses and test the tube for usefulness as a reaction vessel......has anyone tried using the tube for a reaction vessel? .....solo
[Edited on 30-6-2007 by solo]
12AX7 - 30-6-2007 at 20:48
Do mind the 2nd anode connection, which is probably a metal seal, as well as its internal coating (is it barium, or merely metallization --
aluminum?). And the phosphors (rare earths, maybe beryllium among them?).
Use a glass scoring "blade" to snap it at a convienient place, then go over the edges with lots of wet/dry SiC sandpaper to ease the edges. You might
also sand off the aquadag (bonded graphite stuff) on the outside.
I doubt the glass is anything special, beyond the lead content, at least in the face. It's probably not a good idea to heat it, but as a big,
rectangular Erlenmeyer, it'd probably work. Kinda large for swirling titrations though 
The shadow mask probably makes a great screen for sifting things around 100 mesh or less.
Tim