RE: All who know VTTC stuff ;-). (fwd)

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

Original poster: "Robert Heidlebaugh" <rheidlebaugh-at-desertgate-dot-com> 

Kreso: I ALWAYS WIND MY PRIMARY LARGER THAN THE SECONDARY. At no time less
than 1/2 in larger. I use solenoid primary coils wound on a separate PVC
coil form for vacuum tubes. I put my feed back winding on the coil form and
I can choose my height to provide sufficient coupling. On spark gap coils I
use flat primary coils at least 1 in larger at the closest point.
    Robert    H

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, July 25, 2004 5:52 PM
To: tesla-at-pupman-dot-com
Subject: Re: All who know VTTC stuff ;-). (fwd)


Original poster: FutureT-at-aol-dot-com

In a message dated 7/24/04 1:15:06 PM Eastern Daylight Time,
tesla-at-pupman-dot-com writes:

 >Well i tried smaller primary but evrything was sourounded by corona.
 >
 >Im winding the big one today.
 >
 >But i still do not know should first turn of primary be equal with first
 >turn of secondary, or?


Kreso,

Usually they are equal in height.  Raising the secondary relative
to the primary will reduce the coupling.  The height relationships
do not tend to be too critical in a VTTC.  I've run them higher,
lower.... whatever works best.  It sometimes takes a lot of fiddling
with the adjustments of coupling, tuning, feedback, grid leak
resistance, etc., before best results are achieved.

John