Re: MMC bleed resistors

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

Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com> 

Even if they don't blow up like mine did (10kv 2500 pF each, big ones),
they're gonna get hot and waste power compared to pp plastic dielectric.
Also, the pulses will erode the "plates", some aluminum/silver compound
that's only a few microns thick, unless it's some tiny coil running with low
pulse current (might work with a 4/20 nst with a high primary L, but I would
expect no more than 4-5" with ceramic caps). They make nice multiplier or
filter caps though.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, March 12, 2004 8:18 PM
Subject: RE: MMC bleed resistors


 > Original poster: "Tristan Steele" <tsteele-at-westnet-dot-com.au>
 >
 > Would there be any advantage in submerging the capacitor strings in
mineral
 > oil?  I was looking at using about 150 capacitors in an undecided
 > arrangement with a 15Kv NST.  Most likely driving either a 4" of 6" coil.
I
 > had found a source for 4700pF ceramics -at- 3kV for AU$0.19 each, thereby
 > making them a cheaper option then the Geek Group options.
 >
 > Tristan
 >
 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Saturday, 13 March 2004 9:46
 > To: tesla-at-pupman-dot-com
 > Subject: Re: MMC bleed resistors
 >
 > Original poster: "Harold Weiss" <hweiss-at-new.rr-dot-com>
 >
 > Hi Tristan,
 >
 > I tried it with 7.5 and 15KV ceramic disk caps.  The caps would melt the
 > paraffin out and then explode with a flash leaving just the two wires.  I
 > then went to 1 gallon cider jugs with a lot better results.  If your going
 > to go with an MMC, stick with the 942's or equivalent.
 >
 > But then again if you have LOTS of em, lots of parallel strings might get
 > the current down to manageable levels, and prevent their destruction.
 > However, corona losses could be too high to prevent it from being useful.
 > If you have a ton of them taking up space, try it, and see what happens.
 > Either way you can have the fun of watching them pop like little
 > firecrackers or the fun of getting streamers off your coil, or both.
 >
 > David E Weiss
 >
 >   > Original poster: "Tristan Steele" <tsteele-at-westnet-dot-com.au>
 >   >
 >   > Secondly, Is it possible to make a MMC using LOTS of Ceramic
Capacitors
 > (ie
 >   > 4700pF 3kV)?
 >   >
 >   > Many Thanks
 >   > Tristan
 >
 >