Delco 981968

[Cruiseomatic]

This is project 3 of 3...But this one works. Pulled it out of a '59 Buick Electra. I was 15 and REALLY wanted it. The rest of the car was gone. Rust litteraly took it over. So I got what I could that wasn't destroyed and the radio was one of them. It surprisingly works, Need a major alignment. 740 comes up twice on the dial and the further left it goes, the more noise it gets, 740 comes in then 610 then 740 then 950. Needs some parts like the dial lamp holder needs replaced aswell as the cloth wire leading to it.
Before I recap, What could cause low volume and why is the audio louder before the output transformer and half volume after it?
And when the audio is up sometimes it sounds the speaker is overdriven at low volume. I know the speaker can handle any power this old radio can put out. Lastly, A transformer on the back "vibrates" and hums. It is being fed 12VDC just as if it were back in that Buick.
Anyone have any ideas or know where I can find a schematic? Tried Nostalia Air and nothing.
Thanks.
Pictures are coming.