Re: Suitable doorknob caps?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

   I have a bunch of Sprague 0.004 mfd, 15 kV ceramic doorknob 
filter capacitors which I picked up cheap.  They get hod after a 
minute of running, they do change capacitance significantly, but they 
work just fine with these limitations.  Very low series resistance of 
course.  I fried a couple (short and cracked ceraminc) when I tried 
to run them too long but that's the only trouble.

   Advantages:

   Cheap
   Compact
   Low ESR

   Disadvantages:

   Overheat
   Unstable capacitance

Mica are great but very expensive unless you're lucky to find a 
bargain, and they also tend to be much larger.  The multicapacitor 
seems to be the way to go in the long run but don't turn your back on 
anything which can work.

Ed