my next conversion build has an unknown OT Transformer (Halldorson) with what looks like 3 taps. how do i figure out whats what? my guess is 4ohm, 8 and 16 ohm, but thats only a guess. it also comes with a 5V4 rectifier. any opinions? Uncle Doug likes the GZ34 with its slow start up time (s'posed to be easier on the rest of the tubes), but ive also read that the 5V4 is a lot more "steady" with inconsistent supply voltages, which is a big help in central Florida... opinions? also, are there adapter sockets for the larger octals to plug a 12ax7 in its place? or do i have to cap and drill a new hole for the 12AX7?