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RE: plans (fwd)
---------- Forwarded message ----------
Date: Sat, 22 Sep 2007 12:57:52 +0000
From: David Rieben <drieben@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: plans (fwd)
Hi Mark, Dr. Res,
Ah yes, that makes sense now. I thought at first that Dr. R was
mistakenly referring to my VTTC as an SISG coil. My VTTC
can't quite hit 4 ft. sparks and my Green Monster coil exceeds
4 ft.sparks by a factor of >3!
Mark, if we were a bit geographically closer to each other, I might
would take you up on making the Green Monster SISG ;^) Taking
the Green Monster to SISG would require a pretty substantial in-
vestment of time and funds on my part and I am really pretty aca-
demically challenged in a good general knowledge of electronic
circuits. I don't really know anyone locally who could "hold my
hand" to take on such a project. The only reason that my VTTC
works as well as it does is because I closely followed the plans
of Steve Ward and Cameron Prince's modification of Ward's
original plans for an 833 VTTC project. Once I got it to working,
then I was able to make a few MINOR modifications of my own
to further improve the output ;^) Also, until I get a larger enclosed
shop built that I can actually run the Green Monster inside of, I am
really limited on how much time that I can actually fire and tune her
up for "upgrades" since I currently have to fire her off in my drive-
way in the glaring presence of suburbanite neighbors. I haven't
gotten a visit from the local police about my coil yet and I would
like to keep it that way ;^0 I suppose I could try out SISG on a
small scale first to "get the hang of it" before trying it on a "Green
Monster" scale ;^))
-------------- Original message --------------
From: "Tesla list" <tesla@xxxxxxxxxx>
> ---------- Forwarded message ----------
> Date: Fri, 21 Sep 2007 22:30:15 -0500
> From: Mark R Dunn
> To: 'Tesla list'
> Subject: RE: plans (fwd)
> Hey Dr. R:
> The Green Monster still had an RSG at the Teslathon.
> We are trying to convince Dave R. to dump the RSG and switch to SISG, but we
> haven't succeeded yet. Hope to soon.
> I think you were referring to my Dual MOT SISG coil.
> When you turn 50 the memory goes. I have the same problem!
> Great job on the Teslathon.
> Amazing how many people came this year.
> Mark Dunn
>Hi Dr Res, all,
Well, I do have a dual MOT driven coil, but I don't think it qualifies
as an "SISG" coil, if I correctly understand the use if that terminology. It
uses an 833A transmitter triode tube as the "switch", so I believe this coil
would be classified as a "vacuum tube" Tesla coil (VTTC). It is stacatto
controlled too, so as to allow higher power levels to be pushed through
at lower duty cycles and allow for longer sword-like sparks w/out popping
the breaker and/or burning up the the tube plate! It is based on Cameron
Prince's modification of Steve Ward's original 833A vacuum tube coil
plans for 22" to 24" sparks. Since I followed Cameron's modification
with the 2 seriesed MOTs which are then fed to a level shifter voltage
doubler circuit, this allows up to around 7 kV peak voltage on the
tube plate, so I can get up to 36" or 38" sword-like pulsed, spark dis-
charges with mine. Although this consdierably exceeds the tube's plate
voltage rating, I've never had any problems running it in the stacatto mode
and the plate only glows a dull orange.
> >---------- Forwarded message ----------
> >Date: Fri, 21 Sep 2007 16:21:46 -0500
> >From: resonance
> >To: Tesla list
> >Subject: Re: plans (fwd)
> >Yes, I have the info --- contact me off-list. 8.5 foot spark with two
> >Dave Rieben also has a very nice dual MOT SISG type coil with a 4 ft long
> >With the price of copper you can forget "cheap".
> >Dr. Resonance
> >Resonance Research Corp.
> >----- Original Message -----
> >From: "Tesla list"
> >Sent: Friday, September 21, 2007 2:09 PM
> >Subject: plans (fwd)
> > ---------- Forwarded message ----------
> > Date: Fri, 21 Sep 2007 10:14:25 -0700
> > From: Clive Hansen
> > To: Tesla list
> > Subject: plans
> > Does anyone know of good plans for a medium sized coil using two mots and
> > cheap parts?