Re: [TCML] Plastic Capacitors "HG" series

[DC Cox <resonance@xxxxxxxxxxxx>]

The glass mikes are designed for DC filter application.  I've cracked many
of them back in the 1960s before I knew any bettert.

If you call PCI ask for Beau Meskin.  He is the pres. and designed the cap
you have.

D.C. Cox




On Mon, Apr 13, 2009 at 3:13 PM, Ben Buxton <bb@xxxxxxxxxx> wrote:

> Bert Hickman <bert.hickman@xxxxxxxxxx> uttered the following thing:
> > Hi Ben
> >
> > Your caps use a polypropylene-foil dielectric system and are, in fact,
> > made to operate in RF and pulse circuits. At one time, you could look at
> > a Plastic Caps glass-cased cap and tell of it was a DC Mylar cap (Red
> > color) or an RF polypropylene-foil cap (blue color), but I don't know if
>
> Ah ok great. These are blue internally, so it seems to be a case of "so
> far so good", but as you say, it may no longer indicate the actual
> dielectric.
> Given the spec page states they are ok for RF use, it does ass weight to
> their suitability.
>
> > this is still the case today. In any event, a call to the folks at
> > Plastic Caps would be a good idea, if for no other reason than to get
> > their catalog and a copy of the data sheet for your caps.
>
> I'll do this also then, best to be certain!
>
> > Because of their rigid cylindrical construction and misuse by some
> > previous coilers, Glassmike style caps have gotten a bad rap. They have
> > been known to overheat, and even explode, in Tesla Coil use. You may
> > want to consider enclosing them to prevent flying glass danger and
> > sprayed oil mess if you plan to use them in your coil.
>
> Hm also an excellent idea, I'll be sure to encose them in something that
> can contain an exploded cap, even if the company confirms they are
> polypropylene.
>
> Thanks for your thoughts!
>
> Ben
> --
> Ben Buxton - Random Network Person
>
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