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Re: Valves
There are a number of tubes that are available from the medical MRI market
that should do to replace the spark gap. The YC-156 (3CPX5000A7) comes to
mind. This tube has a max plate voltage of 6500 volts can handle 4 amps
continuous or up to 64 amps in a pulse mode. The tube requires no socket,
is a triode and needs about -100 vdc to cut it off. Norm
At 07:24 AM 9/26/99 -0600, you wrote:
>Original Poster: "Bill the arcstarter" <arcstarter-at-hotmail-dot-com>
>
>Mark Finnis <mefinnis-at-medicine.adelaide.edu.au> wrote:
>
> >>Original Poster: "Jim Lux" <jimlux-at-jpl.nasa.gov>
> >>
> >>Except that a thyratron really is a "latching" kind of tube (think of it
> >>as
> >>a SCR) as opposed to an amplifier (like a triode or tetrode). I believe
> >>that Richard Hull did some stuff using thyratrons as a replacement for the
> >>spark gap though...
> >
> >My limited knowledge tells me this means it "stays switched-on" once fired,
> >until the forward current source disappears that is.
> >
> >How would this work with our RF cap oscillations ?
>
>These tubes have a deionization time. If the current stays zero for roughly
>the deionization time, then the tube will switch to a nonconducting state.
>
>I would think that the period between zero crossings for a tesla coil LC
>oscillation would be faster than the deion time, and the tube would
>therefore stay on for the entire oscillation envelope.
>
>But I could be wrong. Depends on the tube. I know the H filled ones are
>faster than mercury vapor tubes, but more than that I don't know.
>
>-Bill
>
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