capacitor find

From:  Edward J. Wingate [SMTP:ewing7-at-frontiernet-dot-net]
Sent:  Monday, June 29, 1998 10:01 AM
To:  Tesla List
Subject:  Re: capacitor find

Tesla List wrote:
> ----------
> From:  Hollmike-at-aol-dot-com [SMTP:Hollmike-at-aol-dot-com]
> Sent:  Sunday, June 28, 1998 12:39 AM
> To:  tesla-at-pupman-dot-com
> Subject:  capacitor find
> Hi All:
>     I recently removed a large cap from an RF generator, but I don't think
> that it was from the part of the circuit that generates the RF.   It seemed to
> be part of a 2600V dc circuit that powered the RF generator.   I was hoping
> someone on the list could tell me anything about it.  What is printed on the
> side is as follows:
>            PLASTICON
>           KNOC 4M  25
>              25 MFD
>           4000VDCW
>    This is obviously a 200J cap, but my question is: what is the dielectric?
> It seems like it could be polypropylene, but could just as easily be Mylar.  I
> desoldered the lid from the can and found three extended foil caps in parallel
> using about 1.25 inch wide tin(?) strips soldered to the ends of each.  I, of
> course, cut the strips in order to change them to a series configuration to
> get a 2.7uF(measured), 12kVDC cap.
>     My hope is to be able to use this as either a tank cap for induction
> heating or even as part of a TC primary cap.  Does anybody know if this will
> work as such?  I am hoping that even if the dielectric is Mylar, that the high
> power rating will allow it to be used without overheating since I would only
> be applying a small fraction of the power that the RF generator was designed
> for(less than 1/10 of what it is designed to handle).
>    Thanks in advance for any info you can give me.
> Mike Hollingsworth


The N in the Condenser Products part number does signify polypropylene
dielectric but the capacitance and voltage values of your modified cap
are not even close to what is needed for a reasonable Tesla tank

Safe Coiling,

Ed Wingate