I'm afraid I start chuckling when I see the phrase "No feedback"
There is feedback all over the place, intrinsic to many devices. Cathode or emitter degeneration is feedback as well. In triodes, the field from the anode influences the net field in the grid area.... more feedback! and it's where the triode characteristic comes from.
What they mean is no visible feedback.
Holy cows machine-gunned while you wait
David