If you are in Britain, it is probably 50 cycle hum, if in the US, most likely 60HZ. Is your hum ambient, through the room, or is it amplified through the speakers? You may just try tightening the mounting bolt that secures the transformer, or you loosening the bolt, slipping a bit of damping material under the trannie and tightening it back up. Make sure that the material is not thermally reactive.
Jolida JD-9A Phono Stage Hum Problem
I have tried all the settings on the rear and both outputs, put cheater plugs on all the gear in all possible combinations, tried different interconnects. This a 2 channel stereo, no video connected. There is a low level hum (sounds like a 50 or 60 cycle hum) that none of the above has any effect, however if I grab, with my hand, the case where the transformer is located (left middle), the hum is reduced by 90%, when I let go, the hum returns. Short of holding the preamp when listening, does anyone have any ideas?
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