Re: Terry Filter Tuning

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Ed Phillips <evp@xxxxxxxxxxx>



I talking about the usual range of nsts, approx 1-3 kVA.  With 
typical small dia coilforms, ie, 4-6 inches, usual production is 
around 1 ft/kVA.  With solid state around 1 ft/450 Watts.

Hope that clarifies it.

Dr. Resonance"

   That doesn't seem right to me either.  I have a small coil here 
(secondary 3.15" diameter x 15" long, wound with #30) and a 14" x 3" 
toroid on top.  It puts out 24" streamers to a grounded spherical 
doorknob with 6.5 amps line current (@120 V) to a 12 kV, 60 ma NST 
and based on comments here at the time I built it I didn't think that 
was particularly good performance.  The cylinder gap uses four 
sections of 3/4" copper pipe couplings.

   I have a much smaller coil using a 2800 V, 20 ma NST which puts 
out pretty fat 4" streamers with about 150 watts (measured with 
electrodynamometer wattmeter) input and don't think that's stellar 
performance either.

Ed

P.S. I don't think quoting transformer ratings is much of an 
indication of power input when the transformers are operated as close 
to resonance as typical NST's are.