Craig's SGTC (plus SSTC)

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Craig Dunn" <craig_d73@xxxxxxxxxxx>

Hi,

I've just started to get decent streamers from my first SGTC so I thought I 
would post the results.  The setup is:

* 4 MOT Stack Power Supply (no oil)
* Inductive Ballast (limits current draw to 10A).
* 80nF MMC (was originally beer bottles).
* Asynchronous Rotary Spark Gap
* 110mm Diameter Secondary (1000 turns 0.55mm wire).

At the moment I'm getting streamers which are over 1 meter long.  I've only 
just started tuning the coil, so it's not performing at it's best yet, but 
I seem to get good results with around 2 turns on the primary.  My original 
calculations led me to believe that best results would be between 3 and 4 
turns on the primary, but this doesn't seem to be the case.

Pictures of the coil and it's streamers can be found on my website 
(www.craigsarea.com/sgtc.html).  Scroll to the bottom of the webpage for 
streamer pictures.

Previously I made a SSTC, which is also on my website 
(www.craigsarea.com/sstc.html).  I really like the robustness of spark gap 
coils.  An out of tune spark gap coil just results in poor performance, 
whereas an out of tune solid state coil often results in having to desolder 
the MOSFET's.  I also think the streamer behaviour of spark gap coils is 
more pleasing than solid state coils.

Hope you like it,

Craig.