only isolated potential displacement
yes! agree, but power is needed for this, or can this happen without using much energy?
the middle bobbin does contain the 2 bifilar wound chokes AND the amp inhibitor coil?
Or does the black choke behave as the 0V ref. amp inhitor?
What is gate and why are the 2 primaries connected as such to the inputs?
I think I don't understand your vic fully yet.