Re: [TCML] A New Kind of Valve Coil

[Roger Smith <rwsmith@xxxxxxxxxxxxxx>]

On 6/19/2011 6:44 PM, Phillip Slawinski wrote:
> Roger,
>
> I had to do a lot of things to push the 833 that hard.  Driving the
> coil via grid feedback is really finicky.  The grid coil is pushed up
> as high as it can go, and that's the only place where it works.  I
> also added some inductance in series with the grid.  When I added the
> inductance I almost doubled the spark length that I could get.  I'm
> not sure these results are very repeatable.  The tube I have seems to
> be more rugged than the standard 833.  I'm able to push about 20kV
> peak on the plate.
>
> http://www.flickr.com/photos/pslawinski/5530682878/in/photostream
>
> I also overdrive the filament to 10.8V.  There may be some more
> performance to be extracted from an 833C based system, but I'm ready
> to move on.  I'm trying to find a larger tube now, so I can make
> longer sparks, and run a higher PPS rate.
>
> -Phillip
>
>
> > Hi Phillip,  Thats quite a remarkable setup there.  Is there anything
> > special you had to do to the 833 tube coil so that it could handle this
> > pulsed mode operation.   I noticed that the tickler coil was up kind of high
> > but I'm guessing that that's where you keep it for CW operation as well.
> >
> > Roger
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Thanks Phillip,  I am currently trying to drive an 833 based system with 
an 3cx10000a3 so this is of great interest to me.  At low power I have 
no trouble getting about a foot of spark but as I increase power it 
doesn't improve much.   The sparks get brighter but not much longer and 
the efficiency goes way down.

Roger
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