A lot of manufacturers use the Philips RC-5 infrared codes. As a rule: manufacturers who use Philips cd-transports will use RC-5, and since it is cheaper to build one kind of remote, their amps etc. will use the same code. The same principle goes for Sony cd-transports etc.
What's even nicer: I once bought the cheapest Sony cd-player I could find, which had no remote. I already had a universal remote, and feelinf playfull, I programmed it so it could control Sony cd-players. And it worked! Since it is cheaper to build only one kind of model, the Sony was fully compatible with its dearer brothers, so I basically had the more expensive version....
What's even nicer: I once bought the cheapest Sony cd-player I could find, which had no remote. I already had a universal remote, and feelinf playfull, I programmed it so it could control Sony cd-players. And it worked! Since it is cheaper to build only one kind of model, the Sony was fully compatible with its dearer brothers, so I basically had the more expensive version....