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Re: [TCML] A New Kind of Valve Coil
Phillip -
I was perplexed by the "extreme" grid feedback coil location when you first built your 833 VTTC, and I see that you have stuck with that location while adding further improvements. On your Flickr page there are some scope shots of the grid drive with and without the added inductor, but no shots of the grid drive obtained at different feedback coil elevations.
Do you remember if you looked at the grid drive signal at different feedback coil positions, and if there was anything that stood out as far as amplitude, pulse shape or pulse timing?
Scott
--- On Sun, 6/19/11, Phillip Slawinski <pslawinski@xxxxxxxxx> wrote:
From: Phillip Slawinski <pslawinski@xxxxxxxxx>
Subject: Re: [TCML] A New Kind of Valve Coil
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Sunday, June 19, 2011, 4:44 PM
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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