I haven't had much time to deal with it at the moment but I've managed to change the tube, replaced it with GZ34/5AR4, Mullard. At first I had the transformer turned on 240v but we have 225-230v from the grid, then after the last change I connected to 230v and the voltages are also as needed. I plan to put another 266L12B on rubber bushings and install side covers, because when rigidly attached to the case, it creates noise. I'm very happy with the sound, what you're letting in it is also coming out of it. I haven't quite figured out if the Sub Hammond 374BX is supposed to get hot like this, 60-70 C in a couple of hours?

Resistors were right, the pipes were wrong (6SL7GT), I replaced with 6SN7, and now voltage like that.