Transformer suitability for a first coil

To: tesla-at-pupman-dot-com
Subject: Transformer suitability for a first coil
From: "Guy and Bettina" <wilson-at-vossnet.de> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
Date: Wed, 21 Oct 1998 17:40:33 -0600
Approved: terryf-at-verinet-dot-com


Question : 
I have assembled a lot of the items needed to make my first tesla coil and
have the following HV transformers - I would like suggestions as to the
suitability of these 
  
1. six oil burner transformers (OBITs), most 10kV, 20mA, casing eathed
(output + and -5kV). I had though of putting several of these in parallel.
These are rated for 30% duty cycle 3 mins - ??
  
2. A Potted Neon 6000v,  50mA, 300W (the local neon man is friendly and has
a whole garage full of these - maybe fifty)
  
Is the voltage too low for consistent spark with a RQ gap ? 
  
If I build a system with these and then change to more power / higher
voltage will the secondary have to be rebuilt as well ? 
  
Guy Wilson 
<mailto:wilson-at-vossnet.de>wilson-at-vossnet.de