Re: New VTTC (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 4 Aug 2007 23:46:54 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: New VTTC (fwd)


PVC can have tracking problems due to its ability to hold water molecules to 
its surface.  Acrylic tube is perhaps a better choice, but expensive.  I 
favor winding the primary on some 1/4 inch dia. G-10 rods (usually 8-10 
pieces in a circle) and then using a "shield" consisting of 6-8 wraps of 
1/8th inch thick polystyrene.  The PS is cut into 48 inch long pieces for 
nearly continuous wrap.  You can make a seam if your overlap approx 4-5 
inches. Go about 1/2 way up the coil with this shield.  PS does a great job 
of holding off RF currents that tend to track even further than 60 Hz AC 
currents.  VTTCs usually operate at higher frequencies than classic RSG 
coils which helps exacerbate the tracking problems.

If you haul your 833 coil to our fall TeslaFest I have a 3,000 Volt, 1200 mA 
plate transformer we could try on your coil.  That should provide all the 
drive you need to get a "full power" operation, at least for testing.



Dr. Resonance
Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, August 04, 2007 10:12 PM
Subject: New VTTC (fwd)


>
> ---------- Forwarded message ----------
> Date: Fri, 3 Aug 2007 23:04:31 -0700
> From: James Zimmerschied <zimtesla@xxxxxxx>
> To: Tesla <Tesla@xxxxxxxxxx>
> Subject: New VTTC
>
> Hello to list members, Lately I have been spending time and money putting
> together my first vacuum tube coil. I wanted to do this type of project
> for a long time but it took incentive such a Cameron Prince's and Chris
> Hooper's results that made me go ahead with the project.
>
> I used the design on Steve Ward's website pretty much as a cookbook design
> (thanks Steve) with some added help from Brett Miller and John Freau. I am
> using the 833C Taylor tube from RF Parts. Many of the other items I had in
> my spare parts so that helped some on cost.
>
> I made use of a bunch of Sangamo mica caps in a MMC arrangement for the
> tank capacitor. I have a staccato board but haven't go that working yet.
> My current best spark length is around 18". This is below the performance
> that others have achieved but I am confident that there is room to
> improve. I will be adding a lexan shield at the top of the primary form as
> others have done. I took a heavy secondary to grid coil arc pushing the
> grid coil location upward. The arcs from this coil burn through PVC
> voraciously in the few seconds of breakdown that occurred.
>
> A few specifications:
> secondary is 900 turns of #28 on a 4 inch PVC form.
> primary is 32 turns of #12 stranded on a 6.5" PVC form
> tank cap is 0.002uF
> grid leak resistor is 5K Ohms (100W)
> grid leak cap is 0.002uF ceramic disks
> one MOT with DC doubling
> three micorwave oven caps (~4uF)
> grid coil is 25 turns of #20
>
> I was happy to be able to get this going without too much problem. Thanks
> to the VTTC pioneers and those who willingly share their knowledge.
>
> I tried to send some photos but they were apparently blocked. If the
> moderator could let me know the current procedure, I could get some photos
> posted. Jim Zimmerschied
>
>
>