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six pac hum

I am experiencing a hum from one amp but not the other with no signal from the pre-amp. It is not dependent on volume level on the pre-amp and the hum isn't transmitted to the speaker. As the bias current increases the hum gets louder. The music sounds fine. Does anyone have an idea about what's causing the hum and what I can do to get rid of it?


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Topic - six pac hum - melvynk 12:10:36 01/29/05 (5)


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