I added calculated coupling coefficients to the spreadsheet in the previous post. "Coupling 1→2" means "Measuring at winding one with winding two opened and then closed an applying k=sqrt(1 - (Lshort/Lopen))".
EDIT: I'm not sure how much this calculation makes sense with open and short circuits. In the real circuit, the output transformer will be terminated with 50 ohms on the wire side and with something like 1-5 ohms (my impression of what the FET output impedance is for the IRF530) on each tube. Maybe scattering parameters with properly terminated windings would make more sense.
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