NST Resistors

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

Original poster: "Tristan Steele" <tsteele-at-westnet-dot-com.au> 

Me Again,

Thanks to everyone that responded, I have now located all required 
parts.  After looking through the data sheets on the components on the 
"original" Terry Filter, I have notice that the listed DigiKey part number 
resistors have a supposed maximum voltage rating of 2845V, yet they are 
running 7500V on a typical 15kV centre tap circuit.  Does this pose any 
problems?  The resistors that I am intending to use are from RS 
Electronics, and are rated at 150W.  They have a "limiting element voltage" 
of 2500V, and a RMS peak of 4500V.  I know that this is nowhere near the 
output of a single 'leg' of the 12/30 that I am intending to use.  Am I OK 
to use these resistors?  They have an Aluminium Heatsink attached for the 
rated 150W.  I am also looking at using a 90mm Secondary, what problems 
exist if I use a 6:1 aspect instead of a 5:1?

Thanks
Tristan