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Re: maxwell pulse cap.
Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
The slosh may have been by design. If it heats at all, the oil will
expand (needs a place to go otherwise hydraulic pressure will create
it's own avenue of escape). If there is any text on the cap like
"THIS SIDE UP", it's a good indication that it was designed to not be
Tesla list wrote:
Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
I also have a Maxwell pulse cap that is rated at .075 uFd
at 40 kV. Yours wouldn't happen to be model # 37217
would it? From what I understand, the 37xxx series are
better caps than the 31xxx series since they are rated for
rapid pulse cycling (100 to 1000 pps). MOST of the 31xxx
series are just rated for 1 pps. Anyway, I just won mine off
of ebay recently and it appeared that it may have lost a small
fraction of its original oil, as it had a bit of an internal "slosh"
when I tilted it back and forth. I removed the threaded nylon
plug and back-filled it with regular transformer oil. It probably
took less than an eye dropper full to "refill" it. I rewrapped
the threads of the nylon plug with plumber's teflon tape and
screwed it back in. No leaks and BTW, there was no visible
signs of external oil leakage before I refilled it, so it may have
come from the factory with an air bubble, although I do find
that hard to believe. No other Maxwells that I have ever had
had any detectable internal "slosh" to it when titlted one way
or the other.
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
Sent: Tuesday, May 08, 2007 4:30 PM
Subject: RE: maxwell pulse cap.
> Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>
> It is a whopper, .075/40kV (tested at 45kV, and it is closer to
> 81nf than 75) as of right now, I am only using it with 8kV so it is
> no problem, but I am looking for a pig or PT, which will give me
> 14.4kV which still doesn't seem that bad, half of 40 is 20. Does
> anybody know where I can get some of that silicone based oil Dr. R
> mentioned to refill it with, it still seems Ok, but I really don't
> want it to die (it is really hard to make a capacitor with 80nf).
> >From: "Tesla list" <tesla@xxxxxxxxxx>
> >To: tesla@xxxxxxxxxx
> >Subject: RE: maxwell pulse cap.
> >Date: Mon, 07 May 2007 22:46:45 -0600
> >Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
> >Hi Scott,
> >Which Maxwell is it? If it is the .03/35Kv we often see, it is rated for
> >voltage reversal which means if you are up in the 12-15kv range, 2 should
> >in series as the peaks are ~17K (on the line) and ~21k respectively.
> >Submerging seems like good idea to me as it will help keep the heat down
> >the lost oil from being displaced by air or other contaminates. Someone
> >please correct if I'm off here.
> >Jim Mora
> >-----Original Message-----
> >From: Tesla list [mailto:tesla@xxxxxxxxxx]
> >Sent: Sunday, May 06, 2007 10:05 PM
> >To: tesla@xxxxxxxxxx
> >Subject: maxwell pulse cap.
> >Original poster: "Scott Bogard" <teslas-intern@xxxxxxxxxxx>
> > I have a maxwell pulse capacitor, which I use for my 6-in
> >coil. It seems to work just fine, but I have noticed that it leaks a
> >small amount of oil (just a tiny bit, barely noticeable). Is this
> >really bad, or perfectly normal? Should I place the capacitor in a
> >bath of oil to prevent further leakage? Thanks.
> >Scott Bogard
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