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

Hey all Tube types, Have many found the "Under" the primary grid coil to be 
"superior" to placing it "over" (on top) of the primary? This is mostly in 
regard to solenoid type primaries, as I have found that "usually" (in my 
limited tests) flat spiral primaries seem to like feed back coils on the 
top (again, I may have missed something).??

Robert, Your mongo Tube coil has fascinated me, but am not surprised that 
you would need some 3/4" diameter copper tubing for the primary with three 
EEV BR1160's. Hope you have some time to  work on it in the not to distant 
future. I am still dealing with 833's. And regrettably am, stuck with 20 
amp, 120 Volt service to my PSU's, :-(


David Trimmell

At 08:28 PM 8/31/00, you wrote:
>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
>http://www.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
>http://www.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

 >>>snip----------> *-*