Re: Variable Cap In Secondary?

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

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

Hi Jake,

Normally this would not make sense.  Disruptive coils are typically tuned
by changing the tap point on the primary coil.  This changes the primary
coil's inductance to perform tuning.  They may have been thinking about
some kidd of vaccuum tube coil or the hand held neon sign leak detectors.
They have an adjustment knob on them but I am not sure how it works.  Maybe
they do what the artical says since these were mentioned.

There has been discussion of making the top terminal height adjustable
which changes the secondary capacitance to perform tuning but that is very
rarely done.  Sometimes people will change the toroid size for tuning
purposes but that is not real common either.  Not sure exactly what this
person was refeering too...

Cheers,

	Terry

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At 04:05 PM 4/7/2001 -0700, you wrote: 
I was looking around on the net for information about Tesla Coils and I
stumbled accross an About-dot-com Physics Dictionary definition stating that it
is a device to create high voltage at high frequency. I already knew that,
but it says something about a variable capacitor with the secondary to tune
it with the primary. Has anybody ever seen or heard of anything like this?
The URL is 

http://physics.about-dot-com/science/physics/library/dict/bldefteslacoil.htm