I did a little research and discovered this set is essentially identical to a Radiola 18 - one of the early AC powered sets.
The tube lineup is 80, 26x4, 27 and 71A.
The chassis with the power supply is known as the "Socket Power Unit" or SPU. Nice of them to include and option for 105 / 125 VAC primary operation. So I should be able to run it off modern line voltage levels.
The mounting screws for the SPU are so rusty I had to snap them off. Not so bad on the other chassis.
Now I can finally get a look underneath.
I had to cut away a sheet of asbestos to get into the SPU
