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This one is all on one PC board, and the knobs can't come off. I'm not that worried about safety.
I noticed something interesting last night; the hum continues when the radio is off. The clock motor is mechanically transmitting vibrations through the cabinet to the speaker cone, which is adding to the 60Hz noise.
Aside from that didn't get any bench time last night. I may modify a radio with no clock in it instead, to get the clock noise out of the picture.
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