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Re: More tube coil stuff (Carl Willis)...

Hey Robert,

Some real snazzy photos!  A pleasure to look at.  (Here's another nice effect-
I procured a 2.6-L neon flask (the neon is ~1 atm) that is made by EGL, and it
makes a great, loopy orange arc inside when I am within a few feet of my coil.)

I would certainly be interested in your progress on Coronatron since I think it
is hands-down the biggest tube coil ever built.  Are you going with a pulsed
(staccato or sputter) mode or are you running straight CW?  And where does an 
EEV BR1160 come from?   I have never heard of this type.  I do believe that
there a lots of tubes made for induction heaters and other equipment that can
get you many more watts for your dollar than the tubes well-known in radio and
audio amps.  Could you clue me in on where your biggies came from?

And what kind of discharge can you get at just 3 kW with the makeshift



Sent by: "Tesla list" <tesla-at-pupman-dot-com>
08/31/2000 09:28 PM CST

To: tesla-at-pupman-dot-com
Subject: Re: More tube coil stuff (Carl Willis)...

Original poster: "Area31 Research Facility" <rwstephens-at-hurontario-dot-net>


I did not use flat spirals but rather concentric solenoids.  I used #22 AWG
enameled wire for the driver winding and #26 AWG for the outboard 3rd coil,
both on 4" PVC.  The driver winding got pretty warm.  No topload, just a
tungsten tip.  22" brush discharge with a single 833A. See
w.geocities-dot-com/CapeCanaveral/Hangar/3108/833mag01.html. The
outboard resonator was 14" wound length, the driver was about 8" wound
length.  Tank coil was #10 solid AWG PVC covered 600 volt wire.  Grid coil
below it was #14 solid PVC covered 600 volt wire.  Form was 8" PVC pipe I
think, it has been a while and I no longer have the device in my lab.

Someone recently asked about my big vac toob TC, the CoronatronTM.  It uses
three 5kW plate dissipation triodes in parallel (EEV BR1160) and runs about
5 kVDC fully filtered on the plate supply at several amps.  I've not had
the chance to play with it in several years.  My plan was to build a
totally new tank for it out of 3/4 inch copper tubing as the present 22
inch diameter tank is made from RG-214, double silver braid coax.  It gets
to the point of almost melting the plastic overcovering after about 60
seconds at just 6.5 kW plate input.  You make stuff outa what you got at
the time.  It is to be a magnifier setup.  I've used it only so far by
dropping the 14" secondary coil from my MTC disruptive TC that throws 13+
footers into the tank.  It suffers clearance and flashover problems by the
time I hit 3 kW in so I've never been able to give it a good test.  The
uncle fester photo
w.geocities-dot-com/CapeCanaveral/Hangar/3108/uncfestr.html with me
holding a 1000 watt tungsten filament lamp in my mouth ablaze as a plasma
globe was taken with me standing near this TC operating below spark
breakout at a low couple of kW input.  The e-field gradient in the area was
quite high.  Sorry, no photos of the Coronatron on the website.

Robert W. Stephens
AREA31 Research Facility

----- Original Message -----
From: Tesla list
To: tesla-at-pupman-dot-com
Sent: Thursday, August 31, 2000 19:57
Subject: More tube coil stuff (Carl Willis)...

Original poster: cwillis-at-guilford.edu

Hi Dave, Other tube coilers,

And now I have found that I get best results with the plate coil -above- the
grid coil.  I have a flat-spiral secondary in two parts to allow some tuning by
changing the mutual inductance between the "pancakes" and the grid coil is a
similar flat spiral.  Tomorrow I am going to try a variety of magnifier-like
configurations with a spare flat spiral I have hanging around, i. e. tightly
coupling this coil to my primary, resonating it with a doorknob capacitor, and
directly coupling its hot end to the base of my secondary, stuff like that.  I
know Robert Stevens (sp?) made a "magnifier" like this that did pretty well.