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Re: Looking for tungsten for rotary gap

Original poster: "resonance" <resonance@xxxxxxxxxxxx>

We carry screw-in tungsten-molydenum alloy electrodes that we screw into brass rod stock, 1/2 inch dia x 1 1/2 inches long, and then press these axially thru 1/2 inch thick G-10 plate x 18 inch dia. for all of our commercial rotors. These work great as they are bonded/welded directly to copper threaded part.

These work much better than the TIG electrodes because the TIG electrodes have no mechanism to attach them to a rotor --- they use special finned aluminum holders and aluminum is not a good choice for RF currents. Even in a Tesla oscillator circuit the peak currents are limited by the series resistance, and any aluminum in the series circuit will limit your peak current because it offer much higher resistivity at RF frequencies than copper.

If anyone is interested contact me off-list and I will email them some photos of our RSG setup.

Dr. Resonance

Original poster: Mike <megavolts61@xxxxxxxxx>

I have a pair of the Miller gaps....they'd make fine stationary gaps...complete with nice heat sinks.....but they only have tungsten on one end.....how would you use them as rotary gap elements?

Original poster: Nick Andrews <nicothefabulous@xxxxxxxxxxx>

Hi Hal,

You might try electrodes like the ones Jeff Mullen had in his coil at
the WWT.  They were the electrodes from Lincoln welders used in the
spark gaps of HF arc starters for TIG welders.  I think he said they
were about $32 per 4 of them.  I imagine Miller welders have something

Nick A

> Date: Tue, 23 Jan 2007 20:49:09 -0700
> To: tesla@xxxxxxxxxx
> From: tesla@xxxxxxxxxx
> Subject: Re: Looking for tungsten for rotary gap
> Original poster: coils@xxxxxxxxx
> Hi Hal,
> I don't have any available, but I can recommend a supplier if you
want to
> buy some.  I have purchased a few rounds of electrodes from them.
> <http://www.diamondground.com/>http://www.diamondground.com/
> Newburry Park, CA
> my contact there  is Tommie Serrano

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