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Re: [TCML] Maxwell #31915 colossal pulse caps
Hi Bert,
Unfortunately, I'm not going to be able to make the
DC's Teslathon this year. I already have reservations
to go to Ec Wingate's in Rochester next weekend,
though. It's pretty hard to convince the wife to let
me go to two out-of-town Teslathons that close to-
gether, you know. I haven't ever made it to Ed's
Teslathon yet so I thought that I would go to his this
year.
--
David Rieben
-------------- Original message --------------
From: Bert Hickman <bert.hickman@xxxxxxxxxx>
> Hi David,
>
> Congratulations on the new additions to the family!
>
> As you probably already know, the Maxwell 31XXX series are usually low
> pulse rated (1PPS) with a few known exceptions (31393, 31981, and
> 31583). I suspect, but do not know for a fact, that the dielectric
> system may use Mylar. If you keep run times reasonable, their large
> physical size has enough thermal mass that they shouldn't heating up too
> quickly.
>
> DC is right - give the GA engineering folks a call. They will be more
> than happy to send you the actual spec sheet if its not a proprietary
> design. And, if you would please, let us know the actual specs (or make
> the spec sheet available for the future).
>
> I notice that the eBay seller in Texas seems to have many more of these
> listed - a bunch of these would make for one really NASTY Marx
> generator. =<:^O
>
> Hope you'll be able to make it to the Cheesehead Teslathon this year.
>
> Best wishes,
>
> Bert
>
>
>
> David Rieben wrote:
> > Hi all,
> >
> > I am now the proud papa of 3 newly acquired Maxwell #31915
> > 100 kV, .44 uF (that's right -- 440 nF!) pulse caps with one
> > more on the way ;^)). Here is an eBay listing of one of these units:
> >
> >
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=360079598908&ih=023&category=
> 4662&ssPageName=STORE:PROMOBOX:NEWLIST#LIST
> >
> > They are of a pretty rotund design with dimensions of 4" x 6"
> > x 29" long and weigh just over 32 lbs. each. Although I can't
> > seem to find an exact part number match, I was able to find
> > some specs from GA's current line of pulse caps that did
> > seem to have a pretty close match to these. I looked up on
> > General Atomics' (since GA bought out Maxwell) webpage
> > for some specs on these on the closest cap in the way of
> > voltage, capacitance and physical dimensions and found:
> >
> > http://www.gaep.com/series-s-ss-capacitors.html
> >
> > Notice the #31427. It is of the same size physical dimensions
> > and weight as mine and has a nearly identical voltage/capacitance
> > rating of 100 kV @ .4 uF. Notice though that it is rated for 1 pps ap-
> > plication and is only rated for a 15,000 shot life. However, I am
> > thinking of someday seriesing 2 or 3 of these units for a super
> > Tesla coil cap in the .16 to .24 uF range. It seems to me that
> > with a 200 or 300 kV ceiling voltage rating, these should be pretty
> > much bullet proof in a large Tesla coil circuit, even with very re-
> > latively high primary voltages, say 40 kV or more, since the shot
> > life expectancy goes up almost logarithmically in proportion to a
> > decrease in the applied voltage, doesn't it? Maybe Bert Hickman
> > or Antonio Quieros (spelling?) could clarify here. (hint --- :^)
> > I suppose about the only other possible limiting factor would
> > be the RMS current levels.
> >
> > Also, the "measured C" that's on the label is generally about
> > .48 uF for each cap and my measurements of them so far
> > has verified a pretty close match - probably measures out to
> > around 8 to 12 nFd less than what the label says.
> >
> > Anyway, tell me what you all think.
> >
> > David
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
>
>
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