[rescue] Slightly OT: Bad Cap Saga

Luke Goembel idylukewild at yahoo.com
Mon Aug 18 11:17:56 CDT 2008

> Not to contradict you, but most of those capacitors are not
> electrolytic at
> all. Most of the electrolytic capacitors of that era are in
> steel cans. 
> They also explode when subject to full voltage after long
> periods of
> disuse, but the explosions are, due to the steel cans, more
> like a vent popping.
> The worst offenders are Sprague "Black Beauty"
> capacitors which were coated
> with some sort of black plastic and supposed to be better
> than anything on
> the market at the time. The black plastic decomposed
> rapidly and some
> of them failed to last. In some cases, the equipment was
> still being 
> manufactured when the first ones failed.
> Geoff.

Thanks for the information! I did some reading on 
'paper' caps and read they are not classified 
as electrolytic, as you said.

Also, the "black beauty" story reminds me that 
sometimes 'improvements' should be taken with 
a grain of salt! Surely the inferior electrolyte 
that has been plaguing caps (since 2000?) was 
marketed as an 'improvement', even if only as 
a cheaper equivalent!

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