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All my previous projects have been tube amplifiers so there may be an obvious answer that I am overlooking.

I do not see ratings for the parts listed in the Kingslayer (and a few other projects I've looked at).  What wattage resistors should be used for pedal projects?  What voltage capacitors?  I'm assuming that most pedals are 9V so they probably don't have to be very large, but I wanted to get an opinion before I start buying.

Thanks for your help.