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688 headphone jack/amp problem


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Hello all! I'm experiencing a slight problem with my 1/4" headphone jack on my 688, and was looking for any insight anyone might have. 


I'm getting a very faint, higher pitched buzz (almost a whine). The volume is very low but noticeable when things are quiet. The volume does not change with the headphone gain... it is constant.   It is present regardless of any other items connected to the BDS. Here is the odd part: when I plug into the 1/8" jack right beside it, no problems, no buzz.  Different headphone produce the same result.   The buzz is only present on the 1/4" jack, and not on the recording itself. 


Any thoughts? Anyone experienced problems with their head oh one amp on the 688?  


Cheers and stay safe! 

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