Yup--You're right, Not sure the actual O/P impedance of this version, but the design has moved on somewhat in recent times.
This version does have a loop/global feedback into cathode of first stage...
There's another thread here that contains the 'evolution' of this amp into what it currently is....
Here you go, This thread was started by someone else on a slightly different design and got sorta taken over....
http://www.diyaudio.com/forums/tubes-valves/189282-vacuum-tube-otl-power-amp.html
This version does have a loop/global feedback into cathode of first stage...
There's another thread here that contains the 'evolution' of this amp into what it currently is....
Here you go, This thread was started by someone else on a slightly different design and got sorta taken over....
http://www.diyaudio.com/forums/tubes-valves/189282-vacuum-tube-otl-power-amp.html
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