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Bad cap, incorrect value. Bad tube, gassy tube, short in tube. Not likely the motor, not likely normal. Since its am/fm, put the switch between bands to where you get nothing, like a tv tuner between 2 & 3, between the detents. Turn the volume through its range, if the hum is constant its a filter cap. If it changes look at the tubes. If its really hard to notice I hesitate to say its normal. I got a few tube clock radios, none have a low hum.
Nice looking radio....
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Yes you can call me "Squirrel boy"
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