[Amps] variable caps

[Joe Giacobello]

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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