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Re: 15kV-at-60ma vs. 7.5kV-at-120ma
From: Richard Quick[SMTP:richard.quick-at-slug-dot-org]
Sent: Wednesday, September 10, 1997 1:10 AM
To: tesla-at-pupman-dot-com
Subject: 15kV-at-60ma vs. 7.5kV-at-120ma
Quoting John Freau
> Previously I had done some work using a 15kV, 60ma (900VA)neon
> trans with .014uf Cap, sync gap, 28 turn pri. and 6" x 26"
> toroid...this set up gave 65" sparks at 2600 watts.
> I wanted to compare the performance using a 7.5kV, 120ma
> (still 900VA) neon trans, with a larger cap. Yes, losses will
> be higher in the tank circuit now. Yes, I could use thicker
> wire and better connections and reduce losses, but I didn't
> bother.
Agreed
> First I installed the 7.5kV trans, a .056uf cap, and tuned at
> turns. Since I'm using #12 stranded pvc ins. wire, I obtained
> n arc-over between the windings that did some damage. Spark
> was only about 12" long. Power draw was about 1900 watts. I
> could not continue this approach without using a "better"
> primary.
> Next, I removed some capacitance for a remaining total of
> .028uF. This set up tuned at 18 turns and did not arc over.
> The TC gave about 56" sparks and drew 1400 watts.
> Final test used .042uf capacitance, tuned at 14 turns, drew
> 1750 watts, and gave 56" sparks. In both this test and the
> previous (above) test, the needle that I press into the
> stranded primary as a tap point got hot and melted the piece
> of poly plastic it was touching...HO... Lots o' current here!
> Anyhow, I thought the tests went quite well, losses were
> higher but acceptable. The spark had no trouble jumping my 8
> series gaps in the rotary. Spark was shorter than at 15kV,
> but power draw was lower also, so I'm not complaining.
> John Freau
Sorry I am a late on this. Excellent data BTW. I have similar
data accumulated but need to know the total gap distance used on
what you indicate is a series rotary tank.
Thanks;
Richard Q.
... If all else fails... Throw another megavolt across it!
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