Re: [TCML] Suitable MMC Capacitors

[Chip Atkinson <chip@xxxxxxxxxx>]

>From what I know and can tell, polyester is a more generic term for a
polymer category of which Mylar is a member.

http://en.wikipedia.org/wiki/Polyester
http://en.wikipedia.org/wiki/Mylar

Interesting to find out that those PETE bottles are a mylar:
http://en.wikipedia.org/wiki/PETE

Gotta love wikipedia!  

Chip

On Sun, 6 Dec 2009, Paul Brodie wrote:

> I am at a loss here. When caps are advertised as polyester, like these, how 
> do you know or discover that they are actually Mylar? I recommended these to 
> Brandon because they were advertised as polyester caps, I thought. Also, is 
> polyester just as lossy as Mylar at high frequencies? Mylar and polyester 
> are two different materials, aren't they?!
> Paul
> Think Positive
> 
> ----- Original Message ----- 
> From: "Bert Hickman" <bert.hickman@xxxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Sent: Saturday, December 05, 2009 10:56 PM
> Subject: Re: [TCML] Suitable MMC Capacitors
> 
> 
> > Brandon Hendershot wrote:
> >> I've heard rumors of a list in the archives consisting of caps known to 
> >> work well in MMC's, and caps known NOT to be used in MMC's. I was 
> >> unsuccessful in finding this list. If one of you could give a link to the 
> >> post if you wouldn't mind. I'm trying to check up on these; 
> >> https://www.fairradio.com/catalog.php?mode=viewitem&item=5330
> >> They're 'Dearborn 430P'. 3 for $12.00 isn't bad at all if they will 
> >> work...
> >> _______________________________________________
> >> Tesla mailing list
> >> Tesla@xxxxxxxxxx
> >> http://www.pupman.com/mailman/listinfo/tesla
> >>
> >
> > Hi Brandon,
> >
> > Steer away from these. They use a metal/polyester (i.e., Mylar) dielectric 
> > system. They'll quickly fail in Tesla Coil use. These used to be Sprague 
> > 430P. A group of former Sprague managers formed Dearborn Capacitor in 1992 
> > and kept the same specs and part number for this series of cap.
> >
> > Bert
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