Hi Jacques,
I have the correct RCA to 5-pin DIN adapter, but there is no sounds.
Been having other teething pains with the Beolab. Remember the lamps flickering at 5 on the volume scale. This slowly got worse and the amp was running a bit hot. Went in not knowing what to look for and found a TINY wire that got somewhere it shouldn't have been. It is like having an entirely NEW amp now, no lamp flickering, a LOT more available power, and the sound improved.
Yesterday the right channel had very little sound and NO upper range, nothing. I tried exercising the slider controls which appeared to help, then not. Switched speaker wires and the problem moved to the other speaker.
I didn't do anything else, but this morning the problem disappeared again, and stayed great all day. I am no tech, but I believe it is a bit of dirt or corrosion in the balance or volume sliders.
Vintage electronic after a complete restoration require a bit of a sense of humor. I love this Beolab and more than willing to be patient.
Jeff