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Re: Maxwell VS. MMC capacitors
Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
If you're going to do some testing be sure to buy the Maxwell caps NEW and
compare them to NEW MMC's. Most experimenters buy used/surplus Maxwell caps
and then complain about early failure. They have absolutely no idea how
many pulses the surplus cap's dielectric has sustained so any test is
totally unfair.
In scientific terms, using used caps totally invalidates the comparison
experiment --- in scientific terms it's called prejudice.
Dr. Resonance
Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo WI 53913
>
> >I think you being unfair in comparing the cost of one cap that's ten
times
> >bigger than it needs to be to an other cap.
>
> When we tested the Maxwells against the CD capacitors, we were looking
> primarily for the same capacitance, not the same dc voltage rating. The
> Maxwells that we used are the ones that are perhaps most commonly featured
> on ebay, the .03uf, 35kv (Maxwell#37667) capacitors. If we had a Maxwell
> 37xxx series that happened to be a .0075uf 35kv capacitor, we would have
> used it instead of four .03uf capacitors. We were looking for good sparks
> from a 15/30. It took 4 Maxwells in series to give us the capacitance we
> were looking for. That's as scientific as it got. We got good sparks from
> both capacitor banks. The 14 CD caps gave us .00714uf and ran for long
> periods without getting warm. The Maxwells gave us .0075uf which also did
> not get warm after long runs.
>
> There was no need to build a capacitor bank from cd caps (4 strings of
70ea.
> .15uf/2kv) to match the dc voltage rating to the Maxwells. I was not even
> using the Geek caps in my test. Geek caps are 2kv, the CD caps I used were
> rated at 1600 volts dc. 1600 x 14 =22,400vdc and we were using a 15/30 on
> them. 14 capacitors divided by 15,000 volts = 1,071 VAC on each capacitor,
> rated for 1600 volts DC. The CD capacitor bank has stood the test of time,
> and it is a testimony to how well they are built that they didn't flat out
> fail, running so close to the edge.
>
> >If you factor that in the Maxwell is just $24 i.e. half the CD caps. or
> >make the CD MMC 10x bigger then it costs $500
>
> Do you know someone selling Maxwells for $24??
> I'm not sure what you are getting at, but if you want to compare apples to
> apples, I'm game....
>
> for both capacitor banks to be dc rated at 140kv........
>
> 280 New, Unused Geek group caps at 3.00 ea..... $840.00 Plus
shipping
> 4 New, Unused Maxwells that list for over $600.00 each... $2400.00 Plus
> shipping
>
>
> As I said before, pay more if you want to, but you will be ahead of the
game
> with the MMC!
>
> The CDE cap coil run can be seen here:
>
> http://hot-streamer-dot-com/temp/16pflex.jpg
>
>
> Maxwell cap coil run can be seen here:
>
> http://hot-streamer-dot-com/temp/maxwellcapsa.jpg
>
>
> Ebay caps such as are illustrated in our simple experiment can be seen
here:
>
>
http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&item=2597967164&category=4662
>
>
>
> >I had assumed the CD caps where cheaper than even used Maxwells. I need
to
> >check out ebay again.
> >Even at twice the price you could say you know what your getting with
the
> >MMC. If its bang for your buck it may be worth the risk of a ebay Max
>
>
> Build it, test it, let us know what happened, that's what I did :-)
>
>
> Dave Goodfellow
>
>
>
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Saturday, February 28, 2004 4:46 PM
> Subject: Re: Maxwell VS. MMC capacitors
>
>
> > Original poster: "Robert Jones" <alwynj48-at-earthlink-dot-net>
> >
> > Hi,
> >
> > ----- Original Message -----
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Saturday, February 28, 2004 9:09 AM
> > Subject: Maxwell VS. MMC capacitors
> >
> >
> > > Original poster: dgoodfellow-at-highstream-dot-net
> > >
> > >
> > snip
> >
> > >
> > > I realize that there are 2 transformers in the picture
> > > with the Maxwells in it, but I can assure you that only one of the
> > > transformers was powered at the time of the photos. I think that 4
> > Maxwells
> > > could handle the 15/30 for some time since they are rated at 35,000
> volts
> > > each, so 4 in series puts them at 140,000 volts, a factor of nearly
10
> > times
> > > the operating voltage.
> > > Cost of the cornell dubilier capacitor bank.......under $50.00
> > > Cost of the Maxwell
> > > bank..............................................$240.00 (for 4)
used
> off
> > ebay
> >
> > I think you being unfair in comparing the cost of one cap that's ten
times
> > bigger than it needs to be to an other cap.
> > If you factor that in the Maxwell is just $24 i.e. half the CD caps.
or
> > make the CD MMC 10x bigger then it costs $500
> >
> > I had assumed the CD caps where cheaper than even used Maxwells. I need
to
> > check out ebay again.
> > Even at twice the price you could say you know what your getting with
the
> > MMC. If its bang for your buck it may be worth the risk of a ebay Max
> >
> > Bob
> >
> >
> >
>
>
>