Re: Tube switch (was -tube coils)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "R Heidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

on 10/11/01 6:14 PM, Tesla list at tesla-at-pupman-dot-com wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <FutureT-at-aol-dot-com>
> 
> In a message dated 10/11/01 2:53:22 PM Eastern Daylight Time,
> tesla-at-pupman-dot-com writes:
> 
>> if one were to have a high voltage, high power triode tube,
>> 
>> could this replace the spark gap thus quiting down the coil while in
>> operation?
>> 
>> Ry
> 
> Ry,
> 
> A normal vacuum tube type triode will not work because the
> impedance is too high.  A hydrogen thryratron will work, but
> needs two of them arranged back-to-back to handle the two-way
> current in the tank.  These hydrogen thyratron systems need
> special triggering circuits and isolation, and may tend to fail
> after awhile.  It's tricky.  I heard there's a new expensive type
> of thyratron that can handle two way currents.
> 
> Richard Hull is the only person I know of who has tried a
> single hydrogen thyratron for a TC.  Since it was a single
> thyratron, he was not able to obtain a full power transfer.
> 
> Cheers,
> John
> 
> 
> 
a hydrogen thyratron requires a variable regulated filament supply to
controlthe gas presure inside while being used. If not used, no tube...dead.
   Robert H