I'm on a search for this midrange driver.
Martin could not supply me one (yet) but he gave me the following info. Maybe someone else has this driver for sale?
Beovox 3000 (mk2) is type 6210
It's a 3,2 Ohm driver (valve impedance) used as midrange.
It's a Peerless G 50 MRC. B&O part number 8480006
He also gave me some advise that the cone can be repaired.
B&O item 1, B&O item 2, B&O item 3,...................B&O item 735
Beovirus? What's that?