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Loud hum with the volume control in any position usually indicates dead power supply filter capacitors. Measure the B+ voltage with a multimeter and compare against the voltage chart on the schematic. These capacitors are normally multi-section units. There are some direct replacments available, but they tend to be expensive. Here is a link to one source:
The info on each section (value and working voltage) is usually stamped on the can.
If you are on a budget, I would replace with single axial lead units of the same value and working voltage. They are available from the above source or Digikey and Mouser. To replace the multi-section can, you'll have to isolate the wiring from the old can (you can leave it in place is you like). The find some space under the chassis to wire and mount the new caps.
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