Re: bulk buy of super caps?

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

Original poster: "Crow Leader by way of Terry Fritz <twftesla-at-qwest-dot-net>" <presence-at-churchofinformationwarfare-dot-org>

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, September 10, 2001 9:40 PM
Subject: Re: bulk buy of super caps?


> Original poster: "Malcolm Watts by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
>
> Hi Ken,
>
> On 10 Sep 2001, at 19:01, Tesla list wrote:
>
> > Original poster: "Ken Kanno by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <presence-at-churchofinformationwarfare-dot-org>
> >
> > Is anybody interested in the possibility of a bulk buy of larger HV caps
> > DESIGNED for Tesla Coil use? I'm thinking of 0.05uF at 20kVAC at upto
> > 200kHZ.
>
> We've been that route before with mixed results. The company in
> question no longer sells to the Tesla community as there was some
> muttering about legal action following the failure of some of its
> capacitors. To clarify on that point: some apparently had some
> problem with internal connections - the company honoured its
> guarantee to the letter. I had both of mine replaced after
> experiencing anomalous behaviour in one. One or two others blew up
> from being overvolted and, I suspect, run at much too high a

Operator error. Stuff breaks when you destroy it.

> breakrate. I understood that the ones I received were rated for
> 120BPS and mine were just some out of the whole batch.

That does not sound like a reasonable rating. My stationay gap coil ran at
several charge/discharge cycles per 120Hz charging cycle. What were the
ratings of these bad caps by the way? Do you know the physical size and
internal construction?

>  I've never played with a MMC, but I question the thin leads like you
> > find on a resistor, as opposed to the woven copper ribbon connections
you
> > can find in a good energy discharge, or induction heater cap which
better
> > match the copper tubing you use for a primary anyways.
>
> Good point - which is why I run a number of strings in parallel in
> the ones I've built. Different styles of caps are used for MMCs -
> metallized PP film, foil PP film etc. By the time the connecting
> leads of my MMCs come to a single termination at each end, it is hard
> to stuff them into 3/8" copper pipe. I've found they work very well.

How many "strands" are you using?

> I wouldn't bother with oil-filled caps again.
>
> Regards,
> malcolm

I don't question any of the problems anybody may have had. Maybe they can
can be avoided a second time though.

KEN