There is formula that provides an approximate answer. However, when I
went to use it recently, I couldn't find it. So I went to the Cardwell
site and took data on their specifications for breakdown voltage and
spacing and plotted it. It, not surprisingly, yielded a straight line
and allowed me to select a suitable broadcast receiver capacitor for
use in the input of a balanced KW tuner. If you think the plot will
help, I can send it to you, but it comes out to about 350 volts per 0.01
inch spacing.
73, Joe
K2XX
The Bowers wrote:
> Is there a rule of thumb for volts vs. plate spacing for receiving type
> variable caps? In other words, how much voltage can I put across it before
> it's likely to arc?
>
> Thanks, Dana, W6TUO
>
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