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Check all chassis grounds. Sometimes there's a ground made through a rivet or screw that has oxidized some and doesn't make good electrical contact. Shine up around it and solder it down to chassis. Not looking at the schematic but the low side of the volume control is usually circuit grounded; in any case needs to have a good tight connection.
Sometimes if you turn the (non polarized) line plug over the hum goes away.
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Reece
Perfection is hard to reach with a screwdriver.
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