Re: [TCML] Rectifying a Tesla coil

[Sfxneon@xxxxxxx]

Beautiful specimen of a tube (or tubes?), Kurt!
 
Is this a 3 phase rectifier? I suppose by having all three tubes share the  
same internal atmosphere, their voltage drop remains matched much longer.  It 
appears to contain some amount of gas or vapor at a low enough pressure  to 
produce cathode rays, causing the glass on the spiral electrode end to  fluoresce 
a greenish color, while being high enough to have a purplish glow  discharge 
in the middle of the envelope. Are their any detectable mercury  droplets 
inside the tubes, or, are those all just light reflections? 
 
You're probably not producing any x-ray radiation that would even escape  the 
glass envelope as long as there is a glow discharge visible inside the tube.  
It would be interesting to find out if it still works, or was pulled from  
service because it became "gassy". I seemed to notice some darkening of the  
glass envelope.
  
Nice find, and thanks for sharing it!
 
Tony Greer
**************

In a message dated 8/31/2008 11:36:03 A.M. Central  Daylight Time, 
k.schraner@xxxxxxxxxxx writes:

Hi,

A cold elecrode tube device, essentially based on the "point  and plate" 
principle, is called "Villard Valve",  see:

http://danielgiroux.neuf.fr/page304.htm

By good luck I was  getting hold of a nice  specimen:

http://home.datacomm.ch/m.schraner/Villard0696k.jpg
http://home.datacomm.ch/m.schraner/Villard0699k.jpg

I  tested it, and the tube is working  fine:
http://home.datacomm.ch/m.schraner/Villard0700k.jpg

However I  don't operate it for extended time, in order to avoid exposure to 
the  unknown amount of X-Rax radiation. (Didn't yet try to charge a 
capacitive  device).

Regards,
Kurt
 



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