Probably a bad tube in the right channel. I would probably look into having it replaced. You might want to contact Signal Path in North Carolina on this.
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I had the same popping problem in the right channel. Sent it to Signal Path and it WAS a bad tube. It's funny but all the reviews and MF literature say a tube has never"failed in the field." What is that about? Their tech was non responsive when I enquired by letter about this. But the tube was replaced and unit is fine