RE: new mmc

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

Original poster: "Ray Robidoux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <robidoux-at-basystems-dot-com>

Hi Brian and All,

The trick I find with doorknobs (and all ceramic caps) is to derate
them by about 4:1 (don't allow a 4000v cap to 'see' more than 1000v).
Then there is no noticeable temp rise and just a little drift. It
makes tuning at least possible. I don't recommend ceramic caps, but
if they are derated by 4:1 they work somewhat OK.

Ray

> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Saturday, March 17, 2001 11:51 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: new mmc
>
>
> Original poster: "brian by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <ka1bbg1-at-mcttelecom-dot-com>
>
> Hi, i was using doorknob type ceramic's left over from a laser
> r+d job years
> ago. the drift was huge. from 4100pf to 2100pf hot! made tuning
> impossible.(also is one of the reasons the laser didnt fire correctly on
> every pulse!) cul brian
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, March 16, 2001 6:57 PM
> Subject: Re: new mmc
>
>
> > Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
> >
> > Hi Brain,
> >
> > Wow! your got it put together quick.  Your other note said you just got
> them a
> > few hours ago :-))  Glad you like the caps.  MMCs are really
> cool!  I was
> just
> > wondering what you were using for a primary cap before???
> >
> > Cheers,
> >
> >         Terry
> >
> >
> > At 06:32 PM 3/16/2001 -0500, you wrote:
> > >
> > > Hi, i just put together a 12 cap string to try on my small coil.
> Awesome!
> > > Thanks for the caps "Terry". out of a OBIT i am getting 14 to 16 inch
> spark
> > > to ground but streamers are in the 20 to 24 inch range. obit
> is 10kv at
> 23
> > > mils.
> > > I also noted that tuning is fussy and adjustment is less than one turn
> now
> > > and before there was really no sweet spot to be had! no heating of the
> caps
> > > and no noticeable drift. Thanks cul brian
> >
> >
> >
> >
> >
>
>
>