How much hum is too much?

[ldatlof]

I just recapped a Westinghouse H-204 AC/DC radio. It plays really well now, except I noticed that if you are standing right next to it you can hear some hum. The hum is there always there and doesn't increase with volume and can't be heard when music is playing or if you are not right next to it. The hum is most easily heard when the volume is at zero. So I was wondering if there was an acceptable level of hum for these old radios or whether there should be no hum at all?

I have not replaced the line cord yet. I also replaced a can capacitor that was 50/50/20 with one that was 50/50/50 and with a higher voltage.