[TCML] air core

["JJR+weluvlucy.com" <jjr@xxxxxxxxxxxxx>]

Hello to the list,
Has anyone ever built a secondary coil without a coil-form. Wouldn't air 
be the ideal coil-form because it has a dielectric constant of 1? And, 
how would one wind a secondary of lets say 20 gauge wire with an end 
result of no plastic, paper, wood, etc. coil-form? Is it possible to 
wind the coil then remove the core that it was wound on. Also, doesn't 
coating the coil with some form of urethane etc. add capacitance to the 
coil which is undesirable?
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