Sometimes it just needs to be grounded. Look for a grounding wire and attach it to a grounded source. Unplug it and the plug it in again after grounding. My turntable goes through this same hum at times and usually it is just that the grounding wire came loose. You can try pushing the wire into the ground in the wall receptacle as well but be careful that you only insert it into the ground portion.
SOURCE: I have an RCA Victor
There is a filter capacitor in the power supply near the power transformer that is open. The capacitor must be changed to get rid of the hum.
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