I never knew this about the cast mica caps John, this is good to know!
By dumb luck I've only used them on 75 and 160 m.
73
Rob
K5UJ
>Beware that the black epoxied Mica cylindrical capacitors are largely intended
>for broadcast band use, found in transmitters and antenna tuning units (ATU).
>They also can work in induction heating generators. But having swept them using
>vector impedance meters, at about 5-10 MHz i found many have their first
>internal resonance and become lossy inductors above that freq. Ceramic
>dielectric caps, NPO doorknobs for example, many in parallel, are better for
>HF.
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