> I've used dozens and dozens of those disposable camera flash units - 
> haven't killed a tube yet.  I was using 10uF 350V electrolytic caps 
> with the tubes since what I needed was a repetitive strobe flash for 
> signalling, not just a single but intense flash.  So far as I know, 
> all are still working after many years of relatively continuous use.

Some rough comparsions of tube outputs with two different caps
and stops

http://home.clear.net.nz/pages/joecolquitt/tube_compare.jpg

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