Agreed, but it seems as though he's getting the right cathode current (by way of measuring mv across the cathode resistors) which would seem to prove that everything is ok. I guess we'll know soon enough.I'm not familiar with that amp but I'd be checking secondary voltages if I suspected a problem with the PT. It's possible to have a winding go bad but the bad ones I replaced have been a dead short. Fuse blows instantly.
I'd be surprised if it's a PT here. I've been suprised before though.