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RE: vacuum tube construction. (fwd)



---------- Forwarded message ----------
Date: Mon, 13 Aug 2007 13:02:40 -0400
From: khalil@xxxxxxxx
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: vacuum tube construction. (fwd)

Quoting Tesla list <tesla@xxxxxxxxxx>:

>
> ---------- Forwarded message ----------
> Date: Mon, 13 Aug 2007 07:52:30 -0400
> From: Jeff Fink <revtec@xxxxxxx>
> To: 'Tesla list' <tesla@xxxxxxxxxx>
> Subject: RE: vacuum tube construction. (fwd)
>
> I am new to this list and ironically this is the first post I have read. 
>
> Over the years I have been experimenting with massive cold cathode vacuum
> tube diodes, looking at the phenomena of PAGD (pulsed abnormal glow
> discharge).  I was wondering if the tube could be used as the spark gap on a
> TC.  I understand there could be X-ray production, but would it be
> dangerous?  Another question: Would the X-rays register on 60's vintage
> Civil Defense radiation dosimeters?
>
> My tube design is incredibly easy to build when you consider that there is
> no grid or filament, though some machine shop work is required.  They can be
> easily disassembled for cleaning and modification. 
>
> My largest is 12" diameter, using a 12" by 3" long by 1/2" wall pyrex tube. 
>
> The anode and cathode are 3/4" aluminum plates.  The tube sets into a
> circular groove on each plate and is sealed with a 3/16" O'rings coated with
> vacuum grease.  A hole and fitting on the cathode plate provides connection
> to a refrigeration vacuum pump sold by Grainger, which developes a very nice
> vacuum.  The tube lights off on only 600 volts. 
>
> Jeff

It wouldn't work so well for a TC because TCs have discharge currents in the
hundreds to thousands of amps and I don't think a discharge tube would handle
that too well for long. Also the 600V firing is kind of low so you 
wouldn't get
much energy output from the coil.