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RE: My VTTC fun begins...

Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxxxxxxxxx>

Hi Brett,

Looks like you are off to a good start... I am not sure if you followed the
VTTC threads I started last year but I made some advances with my VTTC,
which was also based on the Steve Ward design, by increasing the height of
the grid coil above the primary. I was able to achieve a 37 inch arc with
120V/20A or less input power. I have photo documented my progress here:


I also believe you will get better performance by increasing the number of
MOT caps in your system. This was derived from Chris Hooper who is another
VTTC'er that made some advances in the art. His site is here, but seems to
be down right now:


Good luck with your project and drop me a note if you need any help or have


> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Thursday, January 18, 2007 10:53 PM
> To: tesla@xxxxxxxxxx
> Subject: My VTTC fun begins...
> Original poster: Brett Miller <brmtesla2@xxxxxxxxx>
> Dan, John Freau, Steve Ward and VTTC fans,
> I have uploaded some pics to my hot-streamer site
> which document some preliminary tube testing I've been
> doing.
> Here's my test of the filament of the 813 I got from
> Dan Williams.  It was powered (through a variac) using
> the same Zebra MOT which I rewound for the 833
> filament.  It works great for either one, and also for
> my 304TL:
> http://www.hot-streamer.com/brett/misc/813_fil_test1.jpg
> Tonight I also checked the filaments on my 833A's:
> http://www.hot-streamer.com/brett/misc/833lit1.jpg
> http://www.hot-streamer.com/brett/misc/833va.jpg
> Now all I need to do is wait for my doorknobs to
> arrive in the mail, and get my hands on a 5k 100w (or
> thereabouts) resistor for grid leak.  After than I'll
> finish fabricating the hardwood base and wire
> everything up.  Here is a picture showing some of the
> parts I have assembled, including the extremely classy
> toroid I purchased from Mr. Freau several years ago.
> Extra large MOT made by Advance Transformer Co., a
> huge MOT diode for the doubler and the usual pair of
> can caps.   RL network to suppress parasitic
> oscillations on the plate, and of course, the primary
> form which still has needs a primary and grid coil
> wound onto it.  This is very exciting, even though I
> am probably a week or two from first light, maybe
> more.
> http://www.hot-streamer.com/brett/misc/brett_vttc_overview.jpg
> This would not be possible without the excellent work
> of John Freau and Steve Ward, plus many others.  The
> VTTC FAQ is an excellent document from which I have
> learned an immense amount...what an excellent
> resource.   I will keep everyone posted.  Maybe I can
> eventually inspire others to do more VTTC work.  I
> know it has been discussed at length on the list over
> the years, but I always felt it didn't really get its
> fair share.  Maybe we can change that.
> -Brett
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