On 7 Oct 2010 at 23:47, William Donzelli wrote:
If the innards are contaminated, it is possible. An
example would be
the aforementioned paper Sprague "bumblebees" - more often then not,
moisture has penetrated the case and has compromised the dielectric.
You can safely use them at low voltages, as guitarists do, but at
rated voltage (200 to 600 Volts, depending on the type), they will
likely fail.
I remember the bumblebees--black phenolic body with yellow printing,
right?
How about the steel-jacketed Vitamin Q caps? (they could be pretty
scary when they went).
Didn't the old paper caps use oil-soaked paper as the dielectric?
I'm thinking about a bunch of old motor-starting capacitors that I
have kicking around...
--Chuck