Re: strange primary tuning

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Collin,

66nF is a big cap and you smaller coil probably has a fairly high frequency so
2.5 turns is not that surprising.  I seem to remember Jeff's big coil that does
20 foot arcs is using like 3 or 4 turns.  The number of turns does not mean too
much by itself as long as it tunes.

Cheers,

        Terry


At 07:03 PM 2/15/2002 +0000, you wrote: 
>
> hi all    
>         i have just fired up my 4" x21" coil with my 5kv 120 ma nst and a
> .0666uf mmc cap the thing i thought was starnge is i have the primary tapped
> at 2.5 turns for it to fire with a good topload the sparks are very healthy
> at approx a couple of feet 
> is it normal for a primary to be tapped at such a small amount of turns???
>  
> many thanks 
> colin heath