I have a Sansui AU-5500 with the problem noted above. I hooked up a CD player through the tuner section and set up some speakers. One channel plays great, but the other is VERY weak. To try to isolate the issue, I tried different (working) speakers/wiring, then tried the other speaker outputs. The problem persisted. Tried changing the switch on the back separating the amp and preamp. Tried a different input (aux), listened though the headphone connection. Same results. Thinking it might be a dirty pot or elsewhere in the preamp , I hooked up a different (working) preamp through the AU-5500 amp section. Same result. I a baffled. Apparently there must be a flaw in my logic, so I thought I would asked for some input from this group. I am not a technician and have not opened up the case. Ideas or advice? Thanks in advance for any light you can share on this.