Is it volume dependent, if so try vigorously swinging the volume from min to max, this should clean the pot. I have the same amp and had the same issue, all be it right ear, at certain volumes and this cleared it.
It is a bit better but not completely gone. I am using the headphone output of my Lindemann Limetree network player to make sure it is not a source issue. Most of my gear is packed away st the moment so it is difficult to swop sources.
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