Hi payed around £25 for mine. Make is..... on top,model A 30750B output 7.5v 0.5a 3.75 va.
After crushing the cable on my old one but all is well now :-) hope this helps.
Bv7-55 & Bv7-32...Blue,lab1's x4,Yes4Blue, 6000x4Blue,Beocom6000 Blue,Beo5.Oh what a Blue set-up & a Beosound 5...After all,its Bang&Olufsen!