Re: MMC or Maxwell? Which is better?

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

Original poster: "Christoph Bohr" <cb-at-luebke-lands.de> 

Hello Kreso, all

Although I really feel sorry for your mishap I am somwhat happy to hear
this.
All scenarios where I was told that 37667 caps exploded under "normal" TC
use ended like this.
Of course if you stress a cap this way It is no wonder it will fail with
time.
Of course a concervative set safety gap is not a defense against all odds,
but I think if you had
( been going on ) using this your cap might have lasted longer.
After a lot of pondering I will probably stay with my maxwell. If I wanted
the same capacitance and voltage rating
( 60nF ( 2caps ) and 25 KV this would need a lot of CDE caps. I do not doubt
this MMC would work great.
But I do doubt that I can sell the maxwells for a price that will pay the
MMC.
Nevertheless the Geek Group has done great work with theyr MM's. but as I
already have 3 of the 37667 caps already, two in use and one spare,
I will have to stick with these. OK, to be honest, somtimes I feel, I'd
rather have an equaly sized MMC ;-)

This was or is the most euphoric thread I have seen on the list over the
last time, great fun to discuss with you all out there!

Sincerely

Christoph Bohr


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, February 27, 2004 3:25 PM
Subject: Re: MMC or Maxwell? Which is better?


 > Original poster: Kreso Bukvic <kreso.bukvic-at-kc.htnet.hr>
 >
 > I have 5 coils until now ( ops four i sold a small one on e-bay)! The
 > biggest project of mine was a TC with 10 kV 100 mA nst ( original primary
 > voltage 220 V i used variac all the way to 260 so i guess there was more
 > voltage out ). I like tesal coils i use them all day ( dont worry Terry
give
 > me a MMC and you will see it blew to the sky). This coil on resonant rise
 > produced 4 foot sparks, i had a Gregs filter on the nst. One day i was
 > little bit on the mad side and wanted to see what this baybe can do and i
 > stretched spark gap ( rq gap ) so wide it would barely fire wow it make 6
+
 > foot arcs so i leaved it that way! It worked for some time then i take a
 > step up i remowed filter from nst ( resistors eat up some power ) and i
 > squezed a centimeter or two more of spark. Pity, safety spark started
firing
 > so i remowed it to and squezed a little bit more. Then the coil had a
10-15
 > LONG runs in 2 days :-). Two days after i turned it on and BOOOOOM my
 > Maxwell well you allready know what happened! The i made SW caps and
result
 > was not so good so i used quick and dirty async gap that burned the nst
:-).
 > But im lucky my mate works at a local power platn and he just brings me
 > pigs, PTs and thast for free ( aint he good ). But i discard them becausee
i
 > keep only the ones that have a nice voltage and that. Now i got a epoxy
 > potted nst rated for 10 kVac and want to make same sucess coil again. I
just
 > finished repaintin this PT, adding wheels , cables, ballastand and he is
 > ready to rock&roll. But im experiencing a big problem there are no caps in
 > Croatia so i must order internationaly. And i think using 3 - 4 kVac cap
on
 > 10 kV power supply is BS by my calculation i would need 300 geek group
caps
 > ( 150 nF 2 kvdc ) and that is equal to 900 $ + shipping!!! I learned my
 > lesson about stretching the gap and so on but i seriously think and know
 > that these caps if used by the chart will fail in a hurry. Il continue to
 > thinks so until i see it with my own eyes and that is impossible ( you are
 > all too distanced from me ).
 >
 > This is my web site click the 1000 W tesla coil! But first click ulaz (
sory
 > only Croatian ) :-)
 > http://free-kc.htnet.hr/Kreso-Bukvic/
 >
 > Best regards
 > Kreso Bukvic
 >
 > PS. Terry i would like to see the mmc that is overrated and works :-).
Nice
 > try.
 >
 >
 >
 >