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From: firstname.lastname@example.org (John Crighton)
Subject: Re: Spark gap q
Date: Wed, 13 Nov 2002 00:38:09 GMT
X-Newsreader: Forte Free Agent 1.21/32.243
On 12 Nov 2002 10:07:43 -0800, email@example.com (N. Thornton) wrote:
>Is there any combination of material / curent etc that produces a
>fixed spacing spark gap that doesn't burn at all, i.e. would be very
is this the sort of spark gap that you are looking for in this old
If so, they are just thick rods of mild steel with a small piece of
tungsten on the end. These rods with tungsten can be bought
as spare parts at large welding stores. Quite expensive here
in Australia. There is a man who makes them for $12 a piece
here in Sydney by silver soldering old tungsten carbide cutting
tools to the mild steel rod. The solder has to have a high silver
content , 45% or more. I tried the the 2% silver solder and it was
no good. There is a special flux also that has to asked for at
the welding shop to suit the tungsten carbide. I was told the
general purpose flux for silver solder is not as good for tungsten
carbide as the special stuff.
Since I picked up the complete arc starter for $10 I did not
follow up on making my own spark gaps.
Hope this info is of some use.
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