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Re: tube advice needed

Subject:      Re: tube advice needed
       Date:  Thu, 22 May 1997 20:09:20 -0700
       From:  gene lambert <tesla-at-cyberverse-dot-com>
Organization: Tesla Electric, LTD
         To:  Tesla List <tesla-at-pupman-dot-com>
        CC:   tesla-at-poodle.pupman-dot-com
 References:  1


Tesla List wrote:
> 
> Subject: Re: tube advice needed
>   Date:  Thu, 22 May 1997 13:23:11 -0400 (EDT)
>   From:  FutureT-at-aol-dot-com
>     To:  tesla-at-pupman-dot-com
> 
> << John, I am the guy that has a CX140 thyratron.
> > What you mentioned about using a thyratron as a "switch" or spark-gap,
> > is what I would like to do. I am a little weak on the theoretical
> > aspect, however, and so need some help. Is there any information that
> > you know of, that goes into using a tube in this matter? Has anyone out
> > there done it?
> 
> > Gene Lambert
>   >>
> 
> Gene,
> 
> I have not tried the thyratron idea yet.  A normal (non-hydrogen)
> thyratron has a rather slow de-ionization time that is longer than
> one RF ac half cycle long.  Thus, these thryratrons will not shut off
> until the circuit has rung down -- so they're not good quenchers.  In
> addition, thyratrons are not designed for ac use, the reverse voltage
> will tend to cause damage within the tubes.  To solve this, two "back
> to back" thyratrons can be used, each conducting during one half
> cycle.  May be tricky to trigger them properly -- I have no experience
> in this area.
> 
> A hydrogen thyratron is a different beast -- it can deionize in less
> than
> one RF ac half cycle and therefore can be used as a quencher (TC's
> work best with fast, first beat-notch, quenching).  But again, these
> should be used in back to back fashion to work properly.
> 
> Richard Hull has done some preliminary work with hydrogen
> thyratrons which he has posted on this list in the past, and some
> of my comments above are based on his work.  Perhaps Richard
> will present his thoughts on the matter.  I seem to remember reading
> that others have also done some thyratron experiments, but don't
> remember the details.
> 
> Wish I could be of more help,
> 
> John Freau

John, you have helped quite a bit, thank you.
Richard, do you have anything to offer? do I need two CX 1140's?

Gene Lambert