Re: my coils not up to snuff

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com> 

Your transformer is 12/60 nst that is 12kv x 1.414 or 16.9 Kv peak voltage
well over the 25 x 600v = 15Kv rating of your capacitors if your line
voltage is normal not high as it is in non peak times. I have  two banks of
25 , 0.25u 1Kv capacitors in parallel and that is not enough to prevent
failier in time. I use a static  8 section spark gap made of 3" x 1/2"
copper pipe pieces  mounted vertical for air flow cooling, and a copper tube
primary. Copper wire for ground wire ( bare) nearly 1/4 inch is sold at
hardware stores by the foot or in 100 ft+ roles. My toroids are 4" not
streched flex ducting ( N0 Tape). My secondary is #24 space wound 31"  on
4.5" so we are very simalar in use. The only thing I  can suggest is tuning
with more primary turns. I could never tune my coil with 8 turns, but my
capacitance is not the same as yours . I have .o2u and you have .o13u

          Robert     H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Fri, 12 Dec 2003 17:16:52 -0700
 > To: tesla-at-pupman-dot-com
 > Subject: my coils not up to snuff
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Fri, 12 Dec 2003 17:27:10 -0700
 >
 > Original poster: "Sam W." <HAZAA_69-at-hotmail-dot-com>
 >
 >
 > ----- Original Message -----
 > From: <mailto:HAZAA_69-at-hotmail-dot-com>Sam W.
 > To: <mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com
 > Sent: Monday, December 08, 2003 3:08 PM
 >
 > I have a coil running on a 12/60 nst
 > 4.5" x 30" secondary w/21 AWG magnet wire
 > Primary:8 turns of 10 AWG insulated wire
 > Spark gap is a single static with no pressurized air for quenching
 > mmc 25 0.33 uF caps rated at 600VAC in series to make 12500VAC 0.0133uF
 > choke 200 turns 21 AWG
 > 4" flexible aluminum ducting covered in aluminum tape
 > 2" flex aluminum ducting covered in aluminum tape
 > (double toroid)
 >
 > im getting like 3" breakout, with only 9" going to a grounded pole. I
 > couldnt get any thin walled copper tubing, so i used insulated wire rated
 > at 15 kv. if i replace the primary and change the spark gap will i get
 > bigger sparks? im reading about people with similar setups getting like 3-4
 > ft. sparks. This was my first coil, and i did it for science fair. I was a
 > little dissapointed with performance. I dont want to use a rotary gap,
 > cause i cant get a synchronous motor, and asynchs will blow my nst. PLEASE
 > HELP!
 >
 >