Hello and welcome.
I think the "beige cover" is probably just the MDF board that the cabinet is made out of, possibly with the backing of the original pink covering still stuck to it.
The best solution is to completely strip it and re-cover it in something suitable. There is a thread about one somewhere on the forum but note that David is a real expert and so don't expect to get results as good as his!
https://www.vintage-radio.net/forum/...d.php?t=101131
Someone also simply painted the cabinet:
https://www.vintage-radio.net/forum/...d.php?t=134885
Nick.