Re: [TCML] MMC failure / question or advice.

["Ben Sneath" <bsneath@xxxxxxxxxxxxxxxx>]

> Hello  people
> 
> Recently I have been running into some trouble with my
> coil and  what I  believe to be an MMC failure
> but not sure what's causing it.
> I am  running 8 series CDE 942C20P15-F .15 MFD 2000 VDC
> caps in my MMC. First 
>  failure burned a hole
> through two of these caps. I replaced the two bad  caps
> with the same type  and did two more 20 second
> runs which resulted in a  loud snap. No visible damage
> this time but I could  still hear a loud snap or  arc 
> even after the coil stopped functioning. One bleeder
> resistor on one  of my  caps looks to have heated quite
> a bit but it doesn't look burnt.  Primary power input is 2
> 12/30 NST's and a  RQ style gap. This  functioned
> great for years but it seems somewhere something is
> breaking  down now.  Does anyone have an ideas what could
> be happening. I am thinking  maybe it's  time to build
> complete new MMC. Would anyone know if there is a  better
> more robust MMC solution for my   setup?
> 
> Thanks
> 
> Vinnie


a very strange thing is happening with the MMC on my 1"
coil, it is made from a bunch of (i think) .0047uf 270v
ceramic caps (the little blue ones found in computer psu's),
and a few others i had laying around (of random values). the
final ratings were .5nf at something like 5kv. now, they
havent died yet, but i am running them WAY over-votage. they
get hammered with 9-11kv from the induction coil that runs
the TC. WHY HAVE THEY NOT EXPLODED YET??????????
still working good as new......
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