Zenith MJ-1035 audio problem

[Jeffhs]

My Zenith MJ-1035 AM/FM stereo radio will bring in stations like crazy in my area 35 miles east of Cleveland, but I can barely hear the sound. (I know the radio's RF signal circuits are working, because the neon stereo FM indicator lamp on the front of the set lights on every station the set receives.) A few weeks ago, I tried removing the 2-megohm volume control from the circuit, expecting to be blasted out of my apartment when the radio warmed up; no luck. The sound is almost gone now, replaced by a loud 60Hz AC hum. For awhile I was able to get a tiny bit of sound out of the speakers, barely (and I do mean barely) audible over the hum, but not anymore.

I'm stumped, and wondering if something serious is wrong, such as bad output transformers, or whether it's something as ridiculously simple as a bad preamp or output tube. I would be satisfied just to get this radio working in mono; I don't care about the stereo mode, as I have a much newer and better stereo system in the living room. I'd like to get the MJ1035 working just for the sake of having it working again. I have the Sams Photofact for it, so I can reinstall the volume pot when the time comes to do so.

Thanks much in advance.