Original poster: "Gerry Reynolds" <gerryreynolds@earthlink.net> I don't know what the current characteristics of this thing is, but you could series two or three and get good breakdown characteristics and get one heck of a PDT to charge it. Wouldn't that be fun to watch. Gerry R > Original poster: robert sauer <thcduke@optonline.net> > > what can i do with a 21kv .5mfd cap. > >