Preliminary experiments so far indicate the two-stage unit should be able to do 100 kHz to 500 MHz, or 5 kHz to well over 200 MHz, depending on the hookup of the bifilar primary. It's not flat - I'm trying to get it within about a 10-15 dB p-p amplitude range over all frequencies for now, and assuming closed-loop leveling will be used. I can't make meaningful measurements anymore, with the ground loops and RF squirting out everywhere from the loose wiring. I believe it will do much better, like maybe a few dB ripple, once the RF system is properly built. The output transformer (now T2) will remain at 5:1 for all following experiments - I don't want to change it since it's a work of art. The first stage transformer T1 will be experimental for a while yet. It is mounted on the tail of T2, on-axis, using a tricky low-Z interconnect structure that makes T2 partly an autotransformer, with a ratio somewhere around 5.5:1, since the core winding turns are superimposed on the back end of the output post, near the midpoint of the output winding (mesh).
I'll be putting up some photos later or tomorrow.
Ed
