Can you provide a model number? Do you have a schematic?
A coupled of things come to mind, what type of phono cartridge is it, crystal, ceramic, or magnetic? The reason for that question is someone could have replaced the cartridge with the wrong type.
Crystal cartridges can deteriorate over time, I don't know much about ceramic cartridges. If its a magnetic type, they need extra gain, in the form of a preamp.
Turn on the radio and touch each of the phono wires each in turn, with your finger, you should get a very loud buzz from one of them. If not, then a tube would be suspect or faulty wiring. Then go to the volume control but be careful when you touch the volume control as high voltage could be present, (keep the other hand in your pocket so you don't get a shock) The volume control has three wire connectors that look like solder tabs, try touching the center one first, it should have a loud hum or buzz, if it does the the audio section is OK.
Check the wiring connectors to the cartridge, remove and inspect for corrosion, is the other end a RCA or phono jack?
Cold solder joints could be a factor. Check the phono/radio switch for clean and solid contact points.
Check the capacitors around the audio amplifier as they can be open.
As far as reception of radio stations, the signals weaker signals can get lost due to several issues. Some could be caused by a twiddling of RF adjustable components such as capacitor tuning padders, I.F. can screw adjustments, antenna connections or open wires in antenna. The AGC (or AVC) circuit could have problems. and of course the tubes themselves. Some times a blob of solder can short the signal. So check the whole thing for clean and shiny solder joints, also check each tube socket for a firm and clean connection to the tube pins.
This should keep you busy and might solve your problem. Please keep us informed of your progress.
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