What is the chance some of the tubes are weak? and how would you check them?It looks like it is older than anything I saw even as a child and the resistor colour coding is different using a single colour.
The schematic provided by MrChips will be a great help to get you started. I suggest starting by checking all the DC voltages.
It is a TRF ( Tuned radio frequency.) receiver and the volume control seems to control the gain of the first two RF stages rather than being in the audio path.
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