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Re: vacuum tube construction. (fwd)



---------- Forwarded message ----------
Date: Tue, 14 Aug 2007 18:34:57 -0500
From: Drake Schutt <drake89@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: vacuum tube construction. (fwd)

They sell some old recieving (don't know what that means) rectifier tubes on
unitednuclear.com as x ray tubes.  They also make you buy some of their
radiation shielding too.  Can anyone identify them as to whether they are
priced well and their relative size?

thanks
drake

On 8/14/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>
>
> ---------- Forwarded message ----------
> Date: Tue, 14 Aug 2007 15:22:35 -0700
> From: Ed Phillips <evp@xxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: vacuum tube construction. (fwd)
>
> Look up "An Inexpensive X-Ray Machine" Should come up with a reprint of an
> old Scientific American article that pretty much sums it all up.Was going
> to try this myself with a few UV201A tubes I think (can't remember any other
> reason why I'd buy them).Seems easy enough to do! Be careful. Wyatt"
>
>         That article is interesting in that he used a form of "kicker
> coil" to provide the HV.  Tubes [needn't be 201A's if the envelobe and
> getter are right] with heavy magnesium getter should work best but the
> "vacuum" needs to be good enough to avoid gas breakdown but not so good that
> there isn't any conduction at all.  I've tried the idea with several tubes
> from my collection but never had much luck, probably due to lack of
> effort.  Certainly needs long enough exposure to get response from the film.
>
> Ed
>
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>
>
>