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toroid and capacitor power handling (EFHW tuner question for bitx40)

 

I've got a SOTABEAMS mountain tuner and a couple pico tuners that I'm using to get into EFHW antennas.
I'd like to build one that I can use with a bitx40 with a full 20w output, but I can't seem to find info on the breakdown voltage on the caps used in these 6-10w tuners, so I can't seem to figure out just how heavy-duty my cap needs to be.
Also, what's the deal with toroids and power handling? ?How do I determine how much power a given wound toroid can handle at RF?

I plan on building a Match-22 tuner as described in "Hand Carried QRP Antennas," but I'd love for it to be able to take a full 20W so I can use my bitx or my TJ5A with it.

Thanks,
Jake
KE0GYC
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