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Re: [TCML] Proper VTTC Coupling? (coil specs)
Thanks for your comments. The full specs of the planned
small, simple coil are:
Tank cap, mica 0.0005uF or as needed to tune
secondary, 2.5 x 9 inch, 28awg (600+ turns)
primary, 4.5" (?) dia, 22T of 12awg pvc insulated wire
grid coil, 4.5" dia, 18T of 26awg on a sliding form
transformer, small MOT with level shift doubler
small 2.5" dia toroid (maybe)
vacuum tube, 4-125A with socket
filament transformer as needed
grid leak resistor, 30W variable up to 4k ohm
misc, bypass caps, tube cap, hook up wire, hardware, etc.
Base, wood at first to test everything
I'll try both the grids tied together method, and maybe
the screen grid fed by a dropping resistor method. I'll
tap the grid coil at 12 turns or so for use with the tube
grids-tied-together method. I'm considering using a
811A tube or some other tube rather than the
4-125A tube. I may test various tubes in the coil.
I'm trying to decide whether to use a 4.5" dia primary
or a 4.75" dia primary. The 4.5" form is thick PVC,
the 4.75" form is plexiglas. I already have the secondary
coil from previous work.
I may use the coil to research various configurations, etc.
It should make a nice demo coil if the design works out well.
From: Dr. John W. Gudenas <comsciprof@xxxxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@pupman
Sent: Sat, 18 Oct 2008 6:59 pm
Subject: Re: [TCML] Proper VTTC Coupling?
I have never gone past 300mHz. I have no experience working with a VTTC
I suspect your experience and instincts are as good as mine.
When I was at Argonne, I saw a small HV generator that ran around 2
mHz, the secondary was stacked pancake coils
and it was enclosed in a container filled with SF6. It was used with
other devices to power an old spark chamber for particle detection.
Not too useful, but it is all I have.
John W. G.
John W. Gudenas, Ph.D.
Professor of Computer Science
On Oct 18, 2008, at 5:28 PM, futuret@xxxxxxx wrote:
The secondary winding would be 2.5" dia x 9" tall and run at about >
The spark length would be maybe 11" or so.
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