Re: Newark ebay capacitor: primary tank capacitor?

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Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com> 


actually I meant 3.3 nf =3300 pf not that I was going to use just one of
those caps. I considered using 10 for 33 nF. btw, I am hoping to severly
ballast the 4 pack MOT down to a lower current.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, February 25, 2004 6:14 PM
Subject: Re: Newark ebay capacitor: primary tank capacitor?


 > Original poster: Koen van den Berg <cerberus_rex-at-planet.nl>
 >
 > Hi Eric
 >
 > Whoa! 4(!) MOTs? Powering a 3 inch coil? Somehow that 3.3 nF just doesn't
 > sit right with those specs. I'd think more along the lines of 33 nF, if
not
 > much more. If you're using 4 MOTs you have some serious power going there,
 > and a reasonable voltage input. I mean, it's not a pig, but it's a lot
 > beefier than a NST current wise. I'm using two 10 kV 50 mA NST's and I
have
 > a 32 nF capacitor bank with 48 942C's. That works nicely. I don't think
your
 > 3.3 nF bank will work great (read: last long) if you feed it ~8 kV at
200 -
 > 300 mA. Those 942C's are looking a lot better, all of a sudden. If I were
 > you I'd add some MOTs to your stack, ballast it so it won't fry your MMC,
 > and get the CD caps. Yep, they are Cornell Dubilier Caps, and you can buy
 > them off the Geek Group if nowhere else. I'm sure somebody else can help
you
 > out a bit more in that area. They have reasonable prices, and the caps are
 > really excellent. If you don't want to go there just yet, maybe you should
 > just make your own caps. It's a pain, but it would work for a while. And
 > don't let those MOTs bite you... :-)
 >
 > Koen
 >
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Wednesday, February 25, 2004 7:24 PM
 > Subject: Re: Newark ebay capacitor: primary tank capacitor?
 >
 >
 >  > Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
 >  >
 >  > Gah forgot to say, would 10 of the 3300 pf, or 3.3 nF, in paralell be
 >  > suitable for a 3 inch coil with a 4 pack mot supply?
 >  > ----- Original Message -----
 >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  > To: <tesla-at-pupman-dot-com>
 >  > Sent: Wednesday, February 25, 2004 8:27 AM
 >  > Subject: Re: Newark ebay capacitor: primary tank capacitor?
 >  >
 >  >
 >  >  > Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com>
 >  >  >
 >  >  > With doorknob types, it's hit or miss. The ones that are not rated
for
 > rf
 >  >  > will overheat and die. Not sure if there is a way to tell just by
 > looking
 >  > at
 >  >  > them. Usually I've seen a seen a dozen or so 30-40kv ones in
parallel
 > to
 >  > get
 >  >  > the capacitance needed. Considering the cost of that (~$10-20 each),
msnip...