I am afraid the 4600 is not worth a huge amount. This was a good honest music centre but was at the lower end of the B&O range. They tend to sell for between £20 to £90. I note one failed to sell for 99p on eBay though it needed a stylus and the tone arm lift lubricating.
Ebay is your best bet though - to actively sell on this site you need to be a silver member and the traffic you will get on eBay will be much larger.