Not a difficult fault to diagnose on this one, intermittent and erratic operation of the function selector, I never see any point squirting these with switch cleaner as it’s only a temporary fix, there’s also no point replacing it with a new one as it’s easy enough to remove disassemble and clean up. I used a fine metal polish on the contacts which brought them back to as new condition and once reassembled the switch operated perfectly. Once paired with it’s A800s power amp it sounded superb.
