I purchased a very clean Sansui 881 (on ebay) that once connected had a moderate hum through the speakers when volume was at zero. It was slightly louder on the FM setting than the other input. It didn't increase when the volume was turned up so if you turned the music up loud enough you could not hear the hum. Still annoying though. After sorting through the many suggestions on audiokarma, I tried the a few of the simplest fixes first.
1) Cleaned the connector on the driver board with deoxit
http://www.audiokarma.org/forums/showthread.php?t=305438
Still hummed.
2) Replaced the ground braid between caps and pc board with heavy grounding braid (either stainless or tinned solder).
http://www.audiokarma.org/forums/showthread.php?t=515756&page=2
Hummed louder than before. But at least it seemed like a ground was a likely culprit.
3) Replaced the braid with solder wick (not the prettiest solder job) to see if copper braid would work better.
Still hummed but less, though similar to the original hum.
4) I was ready to try replacing capacitors but luckily I kept reading the previous thread. dr*audio suggested tightening the screw on the pc board next to where the solder braid attaches (see photo). I tightened all the screws just for the heck of it. They all seemed fairly tight but I snugged them some more. Plugged it in and....
No hum.
Thanks Warren aka dr*audio
1) Cleaned the connector on the driver board with deoxit
http://www.audiokarma.org/forums/showthread.php?t=305438
Still hummed.
2) Replaced the ground braid between caps and pc board with heavy grounding braid (either stainless or tinned solder).
http://www.audiokarma.org/forums/showthread.php?t=515756&page=2
Hummed louder than before. But at least it seemed like a ground was a likely culprit.
3) Replaced the braid with solder wick (not the prettiest solder job) to see if copper braid would work better.
Still hummed but less, though similar to the original hum.
4) I was ready to try replacing capacitors but luckily I kept reading the previous thread. dr*audio suggested tightening the screw on the pc board next to where the solder braid attaches (see photo). I tightened all the screws just for the heck of it. They all seemed fairly tight but I snugged them some more. Plugged it in and....
No hum.
Thanks Warren aka dr*audio