Gary, the one in the link in your previous post looks like it's a long wire antenna balun, not sure how it would work in reverse, a proper 1:9 transformer (50 ohms in 450 ohms out) should match reasonably well to a valve receiver with antenna and earth inputs, most sig gen matching pads for radio RF alignment were around 400 ohms plus a bit of capacitance and were designed to simulate the average short wire antenna used with most radios back then so far as I remember, some of the old comms receivers had balanced antenna input terminals designed for 400/450 ohm ladder line
Lawrence. EDIT: Whoops.......post crossed.
Lawrence. EDIT: Whoops.......post crossed.
