If the tubes are not lighting look to the primary being open.
AS A RULE you have a 2 green secondary for filaments 6.3 VAC
2 Yellow for the rectifier filaments only. 5 VAC
2 red & a red / yellow center tap to ground.
2 black primary.
2 reds go to rectifies plates.
Rectifier cathodes go to 1st filter cap. Then the B+ goes through the choke
thats in the speaker. Then another cap. This is the B+ for the outputs.
Runs 300- 400VDC
Other B+ sources are dropped by resistors & filtered.
73 Zeno
LFOD !