Re: Tesla Coil Efficiency Test: Tungsten Rod

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <DR.RESONANCE-at-next-wave-dot-net>


Resonance Research stocks 1/2 dia. tungsten screw in tips with 1/2 - 13
thread.  They last over 6 years in daily museum use operating 3-5 times per
day.  Price is $10 per electrode and in stock.

Best regards,

Dr. Resonance




----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, July 09, 2002 4:28 PM
Subject: Re: Tesla Coil Efficiency Test: Tungsten Rod


Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Rscopper-at-aol-dot-com>

Terry,

Welding supply houses carry 1/4" (pure)Tungsten - look for the green colored
end.  Most won't sell just one - only a box of 10 (about $550).  I got some
3/8" gaps by taking apart an old TIG welder.  I also got a 7" long 3/16"
section of 2% lanthenated (non-radioactive)Tungsten by just asking for a
sample
on a web site (haven't tried it yet).  Someone on the list was selling 1/4"
Tungsten also for a while - check the archives.

Scott


>Hi Scott,

>Could you help improve our designs by telling us where to get that 1/4"
Tungsten?  >Is it a pure alloy?  McMaster-Carr has welding electrodes up to
5/32" thick and 7" >long. They also have High-Density Tungsten Alloy Rods of
many lengths and >thicknesses.  But the Melting point is 2012° F, way below
the
pure Tungsten >Melting point of 6192° F.  That stuff was fine for my smaller
coils, but I am nearing >10 KVA and am burning up rods fast.I must have this
1/4" Tungsten Rod.

>Terry Blake