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Adjusting NST



Hi everyone.  Just wondering, would it be possible to power an NST with
another, smaller transformer, rather than simply plugging in into the
wall?  I am asking this because I am working on a project where I need a
high voltage power supply that delivers it at standard alternating
current at 60-cycle  frequency, so hence a simple step-up transformer
like an NST suits this purpose.  However, I have some problems with the
high current output of an NST.  I need an output of very high voltage,
at low current, at 60 hz.  So here's what I intend to do:  Can somone
read this and let me know if this is possible with an NST?  
    My simple arrangement calls for three parts: a transformer which
takes direct wall outlet current and steps it down to a safer level of
about 25 volts, 2 amperes, another transformer which then takes this 50
watts and steps it up to approx. 300 volts at low current, and then
finally the NST itself.  Can the NST be powered by this 300 volts,
thereby theoretically developing very high voltage, but at a "safer" low
current?
Obviously, this output would most likely be useless for any sort of
Tesla Coil, but the experiment I am working on requires a "safe" very
high voltage alternating current, (say, 50 kv) at low amps.  Is this
possible?
Thanks!  Chris T.

P.S.  I hope it does work.  I can't just use a Tesla Coil for this,
becaue the frequency is too high.  I need something at 60 Hertz!