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Re: capacitors



Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

On 15 Oct 2005, at 17:42, Tesla list wrote:

> Original poster: Ed Phillips <evp@xxxxxxxxxxx>
>
> " Usually, mica
> caps are not good for Tesla work because they tend to overheat (power
> dissipation factor >1%) and the dielectric is brittle and not self
> healing."
>
>  Something wrong there.  Good mica caps have a very low dissipation
> factor (<0.001) and work great for RF as long as you don't exceed
> their voltage/current/frequency ratings.  I have an 0.006 ufd 30 kV
> Sangamo capacitor which works just fine with a 15 kV NST and suitable
> gap.  Wish I had about 3 more.  Mica capacitors were used for spark
> transmiters for many years with great success.
>
> Ed

I built and sold a small TC using Sangamo mica primary caps about six
years ago. It is still in use and still works.

Malcolm