[Ralph Barone[_3_]]

Phil Allison wrote:
Ralph Barone wrote:

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PS: the OP just said lately that her keyboard could be battery powered if
desired. I think that's the big test to show whether the "hum" is coming
from the power supply, or the cable to the mixer.



** Some items can still hum though running on batteries, like an
elaborate electronic keyboard stuffed in a plastic box.



.... Phil

Oh, definitely. But if it hums while on batteries, there's no point
fiddling with the power supply to make it hum less.