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expert please !! how to kill this kind of hum ?????

my power amp Hum as soon as I plug in my preamp . no hum when the power amp input open with no preamp connected .this preamp have no hum with my other power amp.
i try cheater plug on both preamp or power amp but no luck .
how can I kill this ?
Thanks all
LT


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Topic - expert please !! how to kill this kind of hum ????? - lovetube 21:55:00 03/29/07 (10)


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