"That's thinking too much like he's using a real balanced driver topology. Floating paraphase is a complete different animal. Due to it's follow-the-leader behavior, only feedback to the input tube really matters. The inverter tracks the output of the input tube, so it will mimic the behavior that balanced feedback would provide when applied to balanced drivers. Also remember that the plate impedance of the inverter is so low (because it utilizes 100% feedback). Applying feedback to it's plate resistor has little effect (even with un bypassed cathode resistor). If anything I'd suspect applying feedback to the input and inverter would make balance worse. "
Ahh so. The inverter has local feedback, lowering its Zo, had missed that.
Using just one Schade Fdbk would risk anomalies from the two primary ends having some differences due to leakage Ls. (other than inversion) So maybe could do double Schade Fdbk to a pentode U1. One Fdbk to its plate, and the other (scaled down) to its screen.
Ahh so. The inverter has local feedback, lowering its Zo, had missed that.
Using just one Schade Fdbk would risk anomalies from the two primary ends having some differences due to leakage Ls. (other than inversion) So maybe could do double Schade Fdbk to a pentode U1. One Fdbk to its plate, and the other (scaled down) to its screen.