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Your hum is probably going to be caused by that brown stand up thing located behind the speaker known as the filter capacitor. You can replace it with modern capacitors. Also, I see what appears to be a "black beauty" capacitor behind the filter capacitor. These are bad about shorting and blowing up and should also be replaced. You can probably fix this for less than $10 in parts.
I'd give $15 for one of those sets if it was clean and not busted up. It's about to the point where I'll buy any tube radio in the $15-$20 range if it looks decent. These things are not as common as they once were and the "antique" shops often think they are worth a fortune.
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