Re: doorknob cap

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Esondrmn-at-aol-dot-com>

In a message dated 7/24/01 5:44:06 PM Pacific Daylight Time, tesla-at-pupman-dot-com 
writes:

<< 
    I use three 0.004 mfd, 15 kV doorknob capacitors here now with a 12 kV,
 60 ma transformer and a 14" x 3" secondary.  Get 24"+ streamers, but
 have to limit running time to about a minute maximum.  Blew up a couple
 of them (punctured and cracked, not sure which came first) until I
 realized how hot they were getting.  They have very low resistance and
 the dielectric loss don't affect the output much, but you have to be
 careful and not overheat them!  I have noticed apparent detuning as they
 warm up, but not a serious problem.
 
    Bottom line is that if you can get them cheaply enough, you will find
 that three or four of them in parallel are quite usable until you get
 something better.
 
 Ed
 
  >>
Ed,

I also use three of these in almost the identical set up that you have.  I 
got these from Mr. D. C. Cox (Dr. Resonance).  Mine run cool.  I have never 
noticed them getting hot.  Maybe a little warm, but never hot.  I do use a 
piece of aluminum about 3/16" thick by 3.0" high by about 8.0" long on each 
side to mount them and connect them in paralle.  Probably getting some heat 
sink action with the aluminum. 

Ed Sonderman