Neither polyester nor most disc ceramics are suitable for RF tuned
circuits. Micas or doorknob ceramics with low temp coefficients are
suitable. You can series a couple of postage stamp micas to increase
voltage rating and parallel them for more current rating. The CDE dipped
micas in Mouser would be suitable. 1000 volt rating would certainly be
enough. 73, Dan, N5AR
RMead100@aol.com wrote:
>
> Greeting to the list
>
> Does anyone have an idea for what voltage rating and types of caps to
> order(or avoid ordering) from Mouser to rebuild my sb221 input section? ( the
> original owner never installed the caps and for some reason bypassed the
> input section.
>
> I have the capacitance values needed from the schematic and parts list, but
> there is no voltage rating, and also mouser does not seem to feature silver
> mica caps, so I'm going to order some other type---polyester, ceramic, or
> whatever---Any consensus on rating and type?
>
> Thanks
>
> Randy K8BUX
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