Re: The Geek Group Caps For Sale

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

Original poster: "Yurtle Turtle by way of Terry Fritz <twftesla-at-uswest-dot-net>" <yurtle_t-at-yahoo-dot-com>

Yes. I had a bleed resistor arc over. I bought them a
long time ago and didn't get good ones. They were
cheap carbon film ones. The damage would have been
minimal, but I kept running through the flames. Photos
will be posted shortly.

I'm convinced that the damage was due to massive
primary strikes, though I haven't really sat down to
analyze this. My primary has nearly 20 turns, but I'm
only using 10 - 15, depending on which secondary and
topload I use. I've had two catastrophic events, which
I'm blaming on primary strikes: The resistor arc over,
which was a problem waiting to happen. And the latest
event was when my primary support caught on fire. My
primary support is 1/2" lexan, and caught on fire at
the exact spot that massive primary strikes were
occurring.

I'd recommend using the resistors Terry suggested for
your MMC.

I'm also going to use a strike rail on my next
primary. I never believed in them, but perhaps with
lots of extra primary turns, there's some kind of
wierd autotransformer thing happening on the end. In
any event, 6 kVA sparks are hot, and can cause things
to heat up.

I'm also curious as to whether anyone else noticed the
Geek Group CD dv/dt  and current ratings. They seem
kind of low to me. I got Seacor caps with the
following specs:

47 nF
1,600 VAC
550 VDC
dv/dt 4,000 V/uSec

All for around $.85 / cap.

--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "cougercat by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <felix1063-at-home-dot-com>
> 
> Just out of curiosity,  Has anybody had any problems
> with arc over on the
> bleeder resistors?  Most 1/2 watt carbon resistors
> are rated for a peak of
> around 700 volts.  1/4 watt would be less.
> 
> --jeff
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Wednesday, April 18, 2001 3:49 PM
> Subject: Re: The Geek Group Caps For Sale
> 
> 
> > Original poster: "Christopher Boden by way of
> Terry Fritz
> <twftesla-at-uswest-dot-net>" <chrisboden-at-hotmail-dot-com>
> >
> > >Original poster: "by way of Terry Fritz
> <twftesla-at-uswest-dot-net>"
> > ><Kidd6488-at-aol-dot-com>
> > >
> > >I thought I heard it mentioned before that these
> would come with the
> > >necessary bleeder resistors.  Is this still the
> case?  If not, what
> rating
> > >of
> > >resistors should we get?
> >
> > 1/2W 10MOhm is the value we use, they are about a
> penny a piece so theyr'e
> > easy to get, you need one resistor per cap (plus a
> couple extra).
> > I have been advised against dealing resistors as
> well (as it just
> > complicates things further, and people can get
> them for practicly nothing
> > anyways).
> >
> > If I can get a good deal on the resistors
> somewhere I'll let you guys
> know.
> > I'm working on it.
> >
> > Christopher A. Boden Geek#1
> > President / C.E.O. / Alpha Geek
> > The Geek Group
> > www.thegeekgroup-dot-org
> > Because the Geek shall inherit the Earth!
> >
> >
>
_________________________________________________________________
> > Get your FREE download of MSN Explorer at
> http://explorer.msn-dot-com
> >
> >
> >
> 
> 
> 


=====
Adam Minchey
yurtle_t-at-yahoo-dot-com
www.geocities-dot-com/yurtle_t/index.htm

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