With all this talk about capacitors I began to wonder : What do Tesla Coils used in museums use as capacitors. I have heard something about some of them have been there for thirty or fourty years. Do the caps in them ever fail at all? Or are they just replaced every once in awhile, and if so, how long is that interval. Do they know something about the construction of caps that we don't? Jeff Corr Oklahoma Tesla Coil Builders Assoc. corr@enid.com