I myself have recently sourced the Sansui AU-X11, it arrived at my home a day back, it works perfectly with no issues, i am using it with the japanese 100volt step down converter. Is there anything i need to check say for example the basis in order to ensure it works fine in a long run. I am yet to open it up and inspect the boards inside. Can some please help with the service manual for the AU-X11, i can only find the service manual of the AU-X1 online. Also what is the nominal DC bias value for the left and right channel to adjust bias, i would like to check and see if the bias is consistent and steady across both channels. I am also going through threads and posts that would be useful for my restoration. I would really appreciate if some one can help me find the service manuals for the Sansui AU-X11. I plan to keep this amplifier for a very very long and am looking at support to find out basics that need to be replaced in order to keep in good shape, also suggest on elements that should be inspected for before ordering for spares and replacement components. Thanks in advance for your time and support. Attached are the pics.