Thread: Remove Hum from AA5
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  #12  
Old 01-23-2012, 12:12 PM
old_coot88 old_coot88 is offline
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Join Date: Sep 2009
Posts: 2,645
If the cause of the `last vestige` of hum turns out to be from the heater string, it seems like heavily-filtered DC on the heaters would be the only 'cure'.
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