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RE: copper static SG problems
Your power level is fairly modest and shouldn't be a problem for the gap you
described. Do you have any forced air flow over your gaps? In addition to
keeping it at a reasonable temperature, performance will benefit with forced
air as quenching is improved.
Or, could there be some contamination (flux?) on your pipes that's
carbonizing as it heats up? Just how close are they spaced?
As far as larger coils performing better, I think their lower frequencies
have lower losses. Also, larger toploads generally give better performance.
BTW, the warning on your web site seems a bit strange coming from a coiler:
"Never use capacitors together with high voltage." ;-)
Regards, Gary Lau
Waltham, MA USA
>Original Poster: "Jan Florian Wagner" <jwagner-at-cc.hut.fi>
>
>Hi,
>
>I'm trying to get my new static SG to work. It's made of copper tube
>pieces in series, and connected to 8kV 50mA NST and a 8nF cap. Tubes are 6
>pieces of 3" long about 1" diameter, thick copper tube pieces. They are
>placed so as just to fire at 10kVDC or so.
>
>The problem is, I can't keep the copper from frying! Even after short run
>times, 10 sec, the copper tube get's pitch black dots that don't conduct,
>and after that the SG fails to fire... :( I have to sand the dots off
>each time to get it working again.
>
>Am I doing something wrong?
>
>Other thing: I've always wondered, how come a 400VA TC with a larger, say
>4", secondary gives longer streamers than a smaller TC with exactly the
>same cap size, voltage and power level? Is this related to the frequency
>somehow?
>
>greetz,
>Jan
>
>--
>*************************************************
> Jan Florian Wagner
>http://www.hut.fi/~jwagner