[ARC5] Mica Capacitor

[Andy]

We used Teflon dielectric caps when losses were not acceptable.
Andy W5ACM


Sent from my iPhone

> On Sep 19, 2016, at 3:22 PM, Bruce Long via ARC5 <arc5 at mailman.qth.net> wrote:
> 
> yeah O kno0w about Corning glass capacitors.  In 1975 when I was an EE undergrad at Penn State the EE student lab got a small truck load of glass caps from Corning which had a television tube factory just 3 miles off campus.   i would expect them to be stable as well HOWEVER in the book "Troubleshooting Analog Circuits', page 42  Bob Pease says " Glass and porcelain are dielectrics that sound like they should have some really fancy characteristics, and excellent dielectric absorption.  But they don't, not very good at all."
> 
> I presume this is why Corning stopped making them and the Penn State Student lab got all the remaining stock.
> 
> I suspect they are fine in RF applications but pay attention to out stability problems if used in VFOs and don't use in guitar amps if you have golden ears.
> From: Richard Knoppow <1oldlens1 at ix.netcom.com>
> To: arc5 at mailman.qth.net 
> Sent: Monday, September 19, 2016 3:31 PM
> Subject: Re: [ARC5] Mica Capacitor
> 
>     I think these use glass as the dielectric. Meant to provide similar 
> characteristics to mica. One can find ads for them in the old electronic 
> trade magazines.  There may be spec sheets for them available.
> 
> On 9/19/2016 12:12 PM, Clare Owens wrote:
> > Nobody has mentioned the Corning glass capacitors so far...  I have a
> > bunch of them in the garage and as I recall they are fairly low in
> > capacitance.  But I imagine they are quite stable over time.
> >
> > Clare
> 
> 
> -- 
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
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