Re: New 4" Coil: MMC blows MMC Away??

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

Original poster: "Jason by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>

I got 26 of these UHV-9A's for $150, plus an extra $50 to ship to the uk -
rock on. I found a seller on ebay who sold something like 122 of these
babies, and asked him if he had more. Lucky I guess! - Ill pull out his
email if youre interested.

Those specs again:
40KVDC, manufacturer tested to 60KVDC
4000pF +- 10%
9ARMS
0.2% dissapation factor

Best Regards,

Jason
[UK Geek #1139 Rank G-2]
[HV / Tesla / Laser / Comp]
[  www.thegeekgroup-dot-org   ]
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, September 05, 2002 6:59 PM
Subject: Re: New 4" Coil: MMC blows MMC Away??


> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>
>
> Tesla list wrote:
> >
> > Original poster: "Jason by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <jasonp-at-btinternet-dot-com>
> >
> > Gary,
> >
> > > The TDK caps you mention are strontium titanate doorknob (ceramic)
caps.
> > > The dielectric losses in such caps are surely higher than in suitable
> > > polypropylene MMC caps, not to mention the temperature stability
issue.  I
> > > would doubt that the performance of the doorknob cap would be
superior.
> > > But aren't both multi-unit arrays of small (MMC) commercial units?
> >
> > Yes, temperature stability is an issue - ceramic caps tend to vary in
value
> > with temperature to a large degree. I had the same doubts as you with
> > regards to dielectric loss, but after testing a load of UHV-3A's on my
mini
> > coil and seeing a performance increase of about 15% I had faith, and
bought
> > some larger caps of the same series. Now m using 10 UHV-9As, 2nF 40kV
each,
> > good for about 9ARMS. After a 10 minute run at 300bps on my 1.1kW coil
the
> > temperature rise measured from the aluminium terminals was negligable
> > (educated guess on Pri. current about 40ARMS). Yes, in a way it is an
MMC of
> > sorts, seeing is it is multiple small value capacitors. I guess I dont
call
> > it an MMC because it is made of large commercial pulse caps, and not
> > hundreds of small value components. All my previous MMCs have been
mounted
> > on 20mm x 3mm copper bus bar, so the only extra resistance was the MMC
cap
> > leads, making a fairer comparison.
> >
> > Best Regards,
> >
> > Jason
>
> How much did those things cost?
>
> Ed
>
>
>
>