If my calculation is correct, it would be about 
205 Khz, assuming the choke is 1 mh.
Mark  WB8JKR
> 
> Returning to the SB-220 and similar amps, what is the parallel 
> resonant
> frequency of the grid bypass cap and the RFC? Whatever it is, the 
> grid
> is totally ungrounded to RF at that frequency.
> 
> 73 from Ian G3SEK          Editor, 'The VHF/UHF DX Book'
>                           'In Practice' columnist for RadCom (RSGB)
>                            http://www.ifwtech.com/g3sek
> 
> --
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> Problems:                 owner-amps@contesting.com
> 
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