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.
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