Re: chokes

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

Original poster: "Peter Lawrence by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Peter.Lawrence-at-Sun-dot-com>

Greg,
     I'ld look into the posibility that your NST died of over voltage
rather than RF. Over voltage can occur if your primary Cap is near
(probably anything within a factor of 2 qualifies as near) the "resonant"
cap size for your NST, and when your primary spark gap fails to fire.
When the primary gap skips a cycle, then the energy in the primary cap
doubles on the next cycle and the voltage goes way up. The fix for this
is not filters, but rather a "safety gap".

Peter Lawrence.

(ps, a formula for "resonant size cap" is  nF = 2.652 * mA / kV)


>Original poster: "Mr Gregory Peters by way of Terry Fritz
<twftesla-at-qwest-dot-net>" 
<s371034-at-student.uq.edu.au>
>
>Thank you all for your individual input on chokes. However, this has 
>served to confuse me even more. Some of you are using a few turns on a 
>3/4" air core. Some of you are saying not to use an RF choke at all, 
>and yet more are saying to use many turns on a ferrite core. All the 
>repliers have claimed that their particular system has worked very well 
>for them. This is all really confusing. I would very much like to hear 
>what people like Richard Hull and Quick have to say on this matter if 
>they are still out there.
>
>Richard Quick used to use 18 turns on a 2" ferrite core. However, this 
>is exactly what I was using when my neon died, so I am a bit skeptical 
>of it. Conversely, I ran my coil successfully for months without any 
>chokes at all! help!!!!!!
>
>Greg.
>
>
>