I have the same problem. My latest thinking is that since they were so paranoid about the buyer opening the amp they may have left the info out. Mine is currently being repaired and I have ask the tech to look carefully for a switch. I am not as concerned as I was as I recently bought a Bob's Devices step up and am very happy with it. It even improved my Blue Circle 707 which is noticeably better than the M3 phono stage, as it should be as it costs $2200. I will let you know if I find out anything, please let me know if you do.
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