Re: Helping someone with broken coil (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 21 Aug 2007 21:34:30 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Helping someone with broken coil (fwd)

Probably about 0.028uF would do him well. Will need to retune the coil 
regardless, but should be pretty close to 10 turns.

Take care,
Bart

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Tue, 21 Aug 2007 20:09:45 -0600 (MDT)
>From: Chip Atkinson <chip@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: Helping someone with broken coil
>
>Greetings,
>
>I was contacted recently by a guy who has a display coil  The capacitor
>blew up and he would like to get the thing running again.  Unfortunately
>he was unable to get any specs from the cap so I'm kind of winging it.
>
>His secondary looks to be 7" in diameter and 22" long.  The coil is
>powered by a 15kV/120ma transformer (nst?) and the primary has 10 turns
>with 4.5" inner radius and 13.5" outer radius.
>
>My question is what is a good capacitor value replacement?  I figure one
>rated for 45kV, but what capacity?  What have others used on coils of
>approximately this size?  My guess is 0.020-0.025uF.  Worth noting is that
>0.021 uF is a resonant capacitor so it should probably be avoided.
>
>Thanks in advance.
>
>Chip
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