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museum capacitors?



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-at-enid-dot-com