[Lowfer] Lowfer Low Pass Filter voltage Rating

[LEE BAHR]

I'm looking for words of wisdom regarding voltage ratings of parts near the 
output (mainly low pass filter) of a Lowfer transmitter and maybe the final 
blocking capacitor.  I'm concerned about static strikes from the antenna 
entering the transmitter.  I have built a lot of Ham QRP rigs with 25 and 50 
volt rated capacitors in these areas but they are not hooked up to an 
antenna 24/7 either.  I understand that the final transistors can get 
knocked out from time to time so static voltage must be hitting the caps 
too.

As mentioned earlier I am in the process of constructing a modified and 
embelished Lyle Koehler Epson Oscillator rig with push-pull output.  I was 
going to use Manhatten Construction but being retired and always up until 4 
AM, I got my second wind last night and layed out a nice printed circuit 
board for it freehand.  (I have never attempted to use a PC program to do 
this but I sure would like to try).  Anyway, the layout really looks good 
and came out great.  However, before I actually etch a board I am wondering 
about component physical size near the output.  (A 400 volt cap is bigger 
then a 50 volt or 100 volt capacitor).  I'd like to do a final board design 
using caps of the appropriate voltage rating which would hold up to some 
degree from antenna voltage spikes).

Could some of you veterans to all this advise my what a good voltage rating 
would be for these capacitors?  I realize a direct strike will knock out any 
size cap.  I'm just trying to make them as small as possible yet hold up to 
some reasonable static build up.  I'm sure you guys know what compromise 
voltage rating is good between reliability and physical size.

Thanks,

Lee, w0vt