Re: [TCML] Suitable MMC Capacitors

["Paul Brodie" <pbbrodie@xxxxxxxxxxxxx>]

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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