Your comments about the 572 do not seem correct. What is the basis for your
belief that they are inferior at 30MHZ?
I have used 4 572's in my amplifier for several years, using virtually all
known species, including the overrated and overpriced SV572. I have no
problem getting full KW out on all bands - except when the line voltage gets
low out here in the country. With only 95 VAC coming in, even if I had one of
those tetrodes with handles I am reduced to a Mississippi kilowatt (I better
get running - I can hear them coming down the street now!)
Eric von Valtier K8LV
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