Re: MMC or Maxwell? Which is better?

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

Original poster: "Robin Copini" <rcopini-at-merlin-dot-net.au> 

Ok, I'll Bite...

  I reckon I may have been the first to use the CDE 942 series caps on a pig
worldwide - well before the Geek Group started
selling them.. My Setup - 33 0.33uf 942C series caps in series on a board
(i.e. 0.01uf per panel), 6 panels in parallel makes
0.06uf total, rated DC for the 942 series is 1600V so per panel gives
52.8KV. The pig is a 33KV 25 KVA rated at 240 input, and I overdrive it to
270V input, so you do the math as far as RMS and peak to peak is concerned.
200 BPS Sync rotary - the whole thing pushes out over 4.5 metre arcs
(measured)
CONTINUOUSLY when maxed out and I have run it for well over 10 minutes until
the 100 AMP breaker gives out. I spent a long time reading about rolled caps
and then Terry and Reinhard demonstrated the MMC concept and I went down
that way instead with nothing else but good faith and some good maths. After
4 years of runtime - not ONE failure, doesnt get hot or warm, no change in
the C value - in short - nothing! - I would be prepared to say MMC's would
be the single most standout revolution in Tesla coiling for the past 10
years at least if not more - sure go down the Maxwell path, but hey, I hope
you like door stops!

Best Regards

  Robin Copini




----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, February 27, 2004 1:10 PM
Subject: Re: MMC or Maxwell? Which is better?


 > Original poster: BunnyKiller <bunikllr-at-bellsouth-dot-net>
 >
 > ummmmmm   I have to differ on that opinion...   I have been using  the
 > 37XXX caps for a few yrs now and havent had a problem yet...   but they
are
 > the 37XXX series caps... ( I seriously believe that makes a
 > difference)  50kv .014mF ( some odd)  mf     4 in series....  being pushed
 > by 28.8+ KV ( dual pig in series)  on a 240+ variac (240VAC input
max280VAC
 > max out 60+amps))  if the math is right 32KV output on the piggie ...
and
 > holding up very well...  yes the caps I have been all replaced by castol
 > oil ..  ( i doubt the capacity of mineral oil due to past
 > failures)  vacuumed ..and sealed with minimal oil vaporization
factors.....
 >
 > producing 12' plus streamers......
 >
 > Scot D
 >
 >
 >
 >
 >
 > Tesla list wrote:
 >
 > >Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
 > >
 > >IMHO, I would not consider using a commercial cap at all.  There are many
 > >stories of expensive commercial cap failures.  The Geek groups caps never
 > >seem to fail.
 > >
 > >The charts the Geek group uses assumes 200% voltage margin, 150% RMS and
 > >Peak current margin, 100% voltage reversal, etc...   The quality of the
 > >Geek caps is untouchable buy the basically hand made commercial caps.
MMC
 > >also contain no oil.
 > >
 > >If one were going to pay say $500 for a commercial cap, ask them if it is
 > >rated for Tesla coil use.  When they say no, believe them...
 > >
 > >Cheers,
 > >
 > >         Terry
 > >
 > >At 07:21 AM 2/26/2004, you wrote:
 > >
 > >>  I'm wondering what is the opinion of the experienced coilers and
 > >> experts. Which is the better choice for a TC tank cap, an MMC of CDE
 > >> 942Cs or commercial pulse cap such as Maxwell.
 > >
 > >
 > >
 >
 >
 >
 >