Re: tesla virgin no more ! but need help

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

Original poster: "steven hyman" <steve502-at-bellsouth-dot-net> 

My caps are Cornell 942C16P15k   rated -at-.15uf 1600VDC . I figured on a total
capacitance
of around .02 uf , why am i way off here?
I have a safety gap set a hair over firing gap space about .28". What I
don't understand is if ..02uf is way overkill for a 15/30 with a static gap
why does the coil operate with my 9/30,
I would like to properly match MMC size and Gap size for this 4" coil based
on  some recommendations

I have not blown any other caps since then
when I apply power to the coil  with  a 15/30
the gap fires briefly the coil functions for 1-5 seconds and then stops.

Steve

Steve


Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, February 05, 2004 10:12 AM
Subject: Re: tesla virgin no more ! but need help


 > Original poster: Mark Broker <mbroker-at-thegeekgroup-dot-org>
 >
 > Congrats on first light!
 >
 > .025uF is *way* too much cap for a 15/30!  You want more like .008uF for a
 > static gap and a 15/30.  Did you retun when you removed capacitors?  Are
 > you using a Safety Spark Gap?  Did you set it properly before
 > operation?  What type of MMC cap are you using?  Brand and model will be
 > great, or just type of dielectric will suffice.  Where on the caps are the
 > holes/failures located?
 >
 > My first MMC used 11 caps per string of 1600VDC caps.  No problems there
 > despite shorting the MOVs in a "Terry Filter...."
 >
 > So I, too, think that your MMC is probably suspect.  Answers to these
 > questions will help us determine what's going on.
 >
 > Cheers,
 >
 > Mark Broker
 > Chief Engineer, The Geek Group
 >
 >
 > On Wed, 04 Feb 2004 18:07:59 -0700, Tesla list <tesla-at-pupman-dot-com> wrote:
 >
 > >Original poster: "steven hyman" <steve502-at-bellsouth-dot-net> I have been
 > >building my first coil (Researched this lists archives for over a month
 > >,along with all the websites Thanks), and had first sparks
 > >on Saturday  WOW!!!, about  15 inches, but having some problems, I cannot
 > >figure out, and need some expert advise
 > >
 > >     Spark gap , static type with 6 ,1" diameter x2" long copper pipes
 > > laid out flat, gap spacing about 1mm  with fan
 > >.  MMC with 2 strings 12 each string(24total of 1600kv .15uf poly's.Total
 > >value .025 uf ??? ( can someone check this)
 > >      I am presently powering this coil with 15/30 NST
 > >
 > >first light was great, ran the coil 10-15 short runs 12-24 inch
 > >sparks.   Then the  spark gap would only fire for about a second and
stop,
 > >after inspecting the MMC realized I had burned 2 caps up ( big holes in
 > >two caps together in series), I replaced these caps, and added 3 more per
 > >string( now qty 15- .15uf 1600kv each per string x 2 strings)) but same
 > >problem, after some evals, my present  situation remains the same , if I
 > >remove the parallel connection between the 2 strings of 15 caps, and use
 > >each string alone, the gap fires ( but no sparks from top load( I can get
 > >spark from topload with breakout), but if I reconnect the 2 strings of
 > >caps , same problem, gap only fires for about a second or two, and
 > >nothing, I have tried the coil using a smaller NST (9/30 )   and the coil
 > >works well all components working with about 15" sparks.
 > >
 > >4" secondary 1050 turns ,24awg, 21.5 " coil length
 > >12 turn primary 1/4 od, 1/4 spacing( tuned at about 7 turns)
 > >
 > >I suspect the MMC  configuration, but cannot figure this out !! I thought
 > >15 x1600kv caps would suffice for a 15/30 nst (15 x 1600=24kv
 > >any help would be greatly appreciated
 > >
 > >Steve
 > >
 > >
 >
 >
 >
 >
 >