Sentinel model 338 trouble

[mbates14]

I picked up a Sentinel model 338 from a flea market for $20. I know im not supposed to plug in things this old into the wall, but i said what the heck since most radios usually work.

well, as expected (unexpected to an extent), there is no sound. not even a slight hum in the speaker (from possibly dry filter). im thinking loss of B+ or bad speaker.

anyone have a schematic to this unit they would like to share? its a 50B5 output.