Re: 833 coil

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

Original poster: "Chris Arnold" <chris_arnold-at-msn-dot-com> 

<snip>

>Since the filament is the cathode, the insulation between primary and 
>secondary of the filament transformer should be good for a minimum of 6000 
>volts. Steve Flowers of Pineville, LA frequently has

</snip>

Tube coil designs that use a high voltage on the cathode are somewhat hard 
to come by.  IMHO it's much easier to elevate the primary circuit to the 
high voltage and ground the filament (with an appropriately sized RF bypass 
capacitor between the leads of course), that way you can get away with 
wrapping your own filament tranny and not have to worry about insulation 
there.  Isolating the primary is something that is very easy to do, since 
you already need a good deal of airspace between it and the secondary.

Chris Arnold