Sansui RA-500 Story...

Hi BeatleFred, many thanks for your reply, I'm going to check and try to see what's going on, otherwise I can change the complete block with one from another brand and do the electrical adaptation, thank you very much for your help.

I can’t tell from the pics what’s “slightly relaxed.” It’s not the tension of the spring that affects the sound, it’s the size and type of spring wire as well as the coil size and number of coils. How do you know this “slightly relaxed” spring is the cause of your imbalance? How did you measure the imbalance?
Hi Sweetbeats, The imbalance occurs at the level of the wet signal, by swapping the springs the problem concerns one of the two springs.

Thanks for your reply.