Re: New MMC has MASSIVE issues

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>

Did you say mylar? That alone is probably the root of all your 
problems. Mylar is very lossy at tesla frequencies. Loss 
=heat=weakened voltage rating of your caps (to the point of melting 
and the cap fails shorted or blows up like a firecracker if enough 
energy is involved).  The reason the 36kV one failed even faster is 
more mylar=more heat. As a general rule of thumb, PP film/foil caps 
(aka CD942c's) are the only mmc's that will survive for any length of 
time (or rf ceramic doorknobs which are usually more expensive).

Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, November 29, 2005 9:34 AM
Subject: New MMC has MASSIVE issues


> Original poster: "JT Bowles" <jasotb@xxxxxxxxxxx>
>
> Hi, remember me saying i am creating a new MMC, rated double my previous cap?
>
> I did that!, and it is closer to matching my NST also.
>
> BUT HERES THE ISSUE:
> *If I look carefully I can see dielectric breakdown on 2 of 12 
> capacitors, while in use
> *The Mylar heats up fast
> *My MMC randomly sparks from one capacitor to another. Sometimes it 
> wont do this at all.
>
> HOW IS THIS POSSIBLE! when I had an 18KV rated MMC, and it gradually 
> broke down. But when i inserted my new MMC, rated 36KV, the MMC 
> began to degrade faster than my old one.
>
> HOW IS THIS POSSIBLE!!!!!?
>
> Wow, i just want a working MMC.
>
> Any solid ideas as to why this is happening, terry? It really is 
> very dissappointing.
>
>
>
>
> > From: "Tesla list" <tesla@xxxxxxxxxx>
> > To: tesla@xxxxxxxxxx
> > Subject: Parting out 900 watt coil
> > Date: Mon, 28 Nov 2005 19:03:55 -0700
> >
> > Original poster: "Hooper, Christopher AZ" <christopher.az.hooper@xxxxxxxxx>
> >
> > Good day great coilers,
> >
> > I am parting out this 900 watt spark gap coil and even the 60ma/15kv
> > transformer (less than 1 hour run time) @
> > http://users.cableaz.com/~chooper/800watt_1200.htm. The only item I am
> > not selling is the top load as Dave at D&M High voltage does not make
> > them anymore and they are rare. Terry Blake bought one on my plexy
> > primary and loved it. I have a lot of love and care into this coil from
> > the low pass filter to the tank to the secondary and just want what I
> > have in it. Why you ask, it is Steve Ward's fault, as he introduced me
> > to Solid State a few years ago and never run my spark gap coils any
> > more. Even the control panel is for sale as my next project is a 200 amp
> > x 240 volt DRSSTC and those CM6OO IGBT's are not cheap even on ebay.
> > Hope these parts can go to a loving home as they need a special place to
> > live.
> >
> > Rgs,
> > christopher