Re: VERY HIGH BPS at 6kw!

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

Original poster: "Mark Broker by way of Terry Fritz <teslalist-at-qwest-dot-net>" <mbroker-at-thegeekgroup-dot-org>

There are many coils similar to yours - check out Greg's Garage on 
http://hot-streamer-dot-com.

Seemingly large caps with MOTs are not out of the ordinary by any 
means.  Keeping the primary surge impendance high is the trickier part.  It 
would be my recommendation that you spend the money on a higher inductance 
secondary instead of the 1/2" copper primary.  The majority of the losses 
are in the spark gap, not the primary winding, afterall.

The Geek Caps will survive your punishment without even a yawn.  :)  3 
strings of 5 big caps (.150uF each) gives .090uF, and 4 strings of 6 gives 
.10uF.  The smaller MMC would handle about 25ARMS, and your coil at 500BPS 
with this cap would run about 17ARMS.  It'd also be less expensive ;)

Regards,

Mark Broker
Chief Engineer, The Geek Group


On Thu, 08 May 2003 21:46:16 -0600, Tesla list <tesla-at-pupman-dot-com> wrote:

>Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><srward16-at-hotmail-dot-com>
>
>Hi all,

<snip>

>So, im thinking of making the cap in the .09 to .1uf range!  I know, this 
>is HUGE.  Right now, im using 13 turns on the primary (7"ID  23"OD
>.25" cu) with a 6.5"x36" 24awg secondary and a 4.5"x30" toroid.  I know 
>that with that huge cap, i will only use a small fraction of those primary 
>turns.  But, just how BAD is this scenario?  Im basically limited to 9kv 
>or so.  I do plan to eventaully (if a 5 turn primary works good for 
>example) make the primary from .5" copper or something bigger.  How bad 
>will the caps be stressed?  I have
>3 strings of the geek type MMC caps, maybe 4 or 5 with the larger cap 
>values (those nearing .1uf).  Are there any coils similar to mine out 
>there?  IF so, what is the typical output?  Id like 10 feet if possible.
>
>Steve Ward
>
>_
>