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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.



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