Building SSTC from Carl Willis old design

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I am building the SSTC from Carl Willis' design on 
<http://www.angelfire.com/electronic/cwillis/fetcoil2.html>http://www.angelfire.com/electronic/cwillis/fetcoil2.html 
. I had 3 questions before I assemble it. 1) is there an updated SSTC 
that is better and just as easy to build and understand. 2) How many 
amps is the 15VDC transformer that I need to buy. I attached a image 
of the circuit I am building.
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