Off-axis primary inductance

• To: tesla-at-pupman-dot-com
• Subject: Off-axis primary inductance
• From: Gary Lau 22-Nov-1998 1518 <lau-at-hdecad.ENET.dec-dot-com> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Sun, 22 Nov 1998 14:23:52 -0700
• Approved: terryf-at-verinet-dot-com

>"I had heard the well circulated wive's tale that off axis L would waste
>energy.  This test graphically proved that it does not.
>
>The practical conclusion is that it IS technically acceptable to place a
>high quality air core tuning coil in series with the Tesla coil primary
>coil in order to achieve 'fine tuning' without throwing away hard won RF
>tank circuit energy!
>
>Real valuable knowledge gleaned by the actual doing.
>
>Robert W. Stephens

This sounds reasonable.  Now it makes me wonder about the importance of
low ESL tank capacitors.  If it's okay to have inductance scattered
anywhere throughout the tank circuit as long as one's coupling is not
compromised and pri/sec resonance is maintained, why should ESL matter?
Could it be that only dielectric, and DC plus skin-effect resistive losses
matter in the tank?  Or is capacitor ESL correlated to resistive losses
in the cap as well?

Gary Lau
Waltham, MA USA

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