I am using a converter with my set top box (dreambox) and beosystem 2 (with attached panasonic display).
Around 15 Euro on ebay.
A cheap one is enough, it is only digital conversion.
Ralf
My Beo: Beosound 3000, Beolab 4000, Beo 4 DVD, Beolab 5000/Beomaster 5000, Beovox S45.2 with Stands, Beosystem 7000 black with Beolink 7000, Beolink 1000, F1000 (3 cubes), Beovox 5000, Beovox 3000, Attyca 1.