Re: Coil sensitive to primary tapping

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

Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Hi Aaron,

The sensitivity may be the how much the frequency changes the inductive 
change on the primary. Some coils have a narrow range and some are much 
more forgiving. This is in the tank LC. It may also be that you don't have 
enough turns and are on the low end of inductance. You gave very little 
information to examine the coil (example, a 15 turn primary could be any 
wire size and any inner diameter or outer diameter). More info would be 
helpful for someone to analyze where your at relative to we think you 
should be. Or if you want, you can simply do trial and error by adding more 
turns and seeing if this helps.

Take care,
Bart

Tesla list wrote:

>Original poster: "Aaron Aab" <striker754-at-earthlink-dot-net>
>Guys,
>
>My coil is extemely sensitive to the primary tap. It refuses to make any
>sparks if you move it off the last coil or so. It works best on the very end
>of the last one.
>
>Currently it is a 9kV/60Ma, 15 turns, 30X6.5"secondary, 7x24" dryer duct
>toroid, 0.025uf/12kV capacitance
>
>Any ideas?
>
>Aaron
>
>
>
>