I think the PT is supposed to be a 290AX, not the not the 291AEX, that's for a Champ. IDK if it'll make a big difference, but I think I'm going to pick up a 290AX unless I get a thumbs up on the 291AEX.PT hammond 291AEX
OT hammond 1760E
Those are what I use
If you put in a 12” speaker you will have to lower the value of the cathode bypass cap on V1A to 4.7uf. I highly recommend the Celestion cream Alnico. It sounds amazing in a PR. Expensive but worth it imho
The 1760E OT will work instead of the 125A10B called out for in these drawings. Reverb driver too.