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Re: sparks running down secondary - why?
Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-qwest-dot-net>" <vanyo-at-echoes-dot-net>
Replying to my own message here - let me know if it makes sense. :)
Tesla list wrote:
> Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> Last time I ran my coil, I got occasional loud snappy sparks running
> down the length of the secondary, as well as occasional firing of my
> safety gap. Wondering what causes the sparks down the secondary, and if
> it's a problem?
Seems it depends on how I set my static gap. If I narrow it a bit, the
arcs on the secondary (and the safety gap firing) stop - so that's what
> The only change I made since my previous run (which was still
> underperforming, but perhaps due to wind - not sure - this is my first
> coil) was to hook my NST power supply (three 15/60's, two with internal
> PFC) to a seperate 20 amp line. I could now run it without tripping the
> breaker. I still plan on hooking it to a 30 amp 240 volt line, stepped
> down by variac to 120 volt.
Just tried it on the 240 volt 30 amp line, stepped down to 120 using the
variac. Best sparks so far - very bright purple-white, but still short
- about 3 to 3/12 feet now. But I'm still running outdoors with
somewhat of a breeze. I'm hoping that the breeze is the problem.
> Oh, and the other change is a bigger topload. Originally, I had a
> smaller toroid, and now have added a larger one on top. I can run with
> just the larger.
Now I'm just using the single larger toroid.
BTW, I can confirm what someone else once reported - my secondary
retains an appreciable static charge for quite some time after being
disconnected from the rest of the apparatus.
> Thanks again,
> Bill V.
> Specs again:
> Power Supply: Three 15/60 NST's (two have internal PFC), with Terry's
> protection filter on the
> high voltage side, and redundant line filters and a 50 amp variac on the
> 120V side.
> Capacitor: A Maxwell 30 kV, 0.06 uF cap (model # 37321).
> Static Spark Gap: 9 copper pipes mounted in a blower box, with
> adjustable spacing.
> Secondary: 1000 turns of 22 awg, 6.5" (closer to 6 5/8) diameter, 27.5"
> winding length. Countless coats of polyurethane.
> Primary (just rebuilt): Flat spiral, 10 turns of 1/4" copper tube, 1/2"
> spacing on centers. Inside diameter 9.5". Tapped between 6 and 7
> Toroid: I have two toroids, both aluminum dryer duct, and constructed
> so I can easily attach either or both. The smaller is 6 inch cord with
> 14 inch center to center spacing, and the larger is 8 inch cord with 24
> inch center to center spacing.
> Ground: 32" segment of copper clad iron ground rod.