Re: HV Capacitors - PTFE (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 23 Sep 2004 14:02:19 -0400
From: humanb@xxxxxxxxxxxxxxxxxxx
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: HV Capacitors - PTFE (fwd)

Hi Carl, I din't know you were into High Voltage to! I 
would be concerned about the air in the PTFE powder, even 
when compressed. Most folks use MMC's as Gomez mentioned, 
they should get you a nice RF rated pulse cap into the 20 
KV region. Not sure how far you can go with then due to 
corona issues.

By the way, I din't know you were still in the Pyro retai 
buisiness, as your website hasn't worked for sometime.

Take care,

David Trimmmell

On Thu, 23 Sep 2004 11:32:09 -0600 (MDT)
  "High Voltage list" <hvlist@xxxxxxxxxx> wrote:
> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
> ---------- Forwarded message ----------
> Date: Thu, 23 Sep 2004 10:31:34 -0600
>From: Gomez Addams <gomez@xxxxxxxxxxxx>
> To: High Voltage list <hvlist@xxxxxxxxxx>
> Subject: Re: HV Capacitors - PTFE (fwd)
> 
> 
> On Sep 23, 2004, at 9:33 AM, High Voltage list wrote:
> 
>> Original poster: <sroys@xxxxxxxxxxxxxxxxx>
>>
>>
>>
>> ---------- Forwarded message ----------
>> Date: Thu, 23 Sep 2004 08:47:28 -0500
>> From: Carl Litton <Carl_Litton@xxxxxxxxxx>
>> To: High Voltage list <hvlist@xxxxxxxxxx>
>> Subject: HV Capacitors - PTFE
>>
>>
>> Our new local HV group is finding the securing or 
>>producing reliable,
>> high capacitance capacitors at low cost for working in 
>>the 10's of kV
>> range a serious challenge.
> [snip]
>> Any ideas would be appreciated.
> 
>  What is your application?  Designs which work well for 
>CW RF do not
> work well for DC filtering, and designs for either of 
>those do not work
> well for pulse-discharge applications.
> 
>  Most people I know who are building Tesla coils have 
>either wound their
> own from PE film and thin aluminum roof flashing (then 
>immerse in oil 
> and
> pull a vacuum to eliminate bubbles) or more recently, 
>the multi-mini-cap
> (MMC) designs using strings of 1600 volt, low-loss 
>polypropylene caps.
> 
>