My dad has an old radio that still works really well that he inhereited from his mother, from the era when there was no TV and radios were like a piece of furniture (it is huge and GOLD). Well, my dad would like to feed other audio into this thing (fed from like the CD player, etc). He says it has input ports, somewhat like the S-video type, but it isn’t the same. Does anyone know what this sort of adapter might be called or even where I might be able to find one? He seems to think it might be European as well, but he doesn’t need any special power adapters to play it, so I don’t think so.
Usually, audio inputs are on “RCA” or “phono” jacks. These are the same type of jacks used for composite video - on a TV or VCR, they’d be the ones with the yellow centers. On a radio, they’re going to be either a pair of red and white-centered jacks for stereo or a single jack for mono. Likely labeling for the jack(s) is AUX IN or TAPE IN. Jacks labeled as PHONO are almost guaranteed to be unsuitable.
To plug a CD player in with these, he’d just need a regular audio cable, aka patch cable. To plug in a portable CD player or iPod, he’d need a 1/8" headphone plug to RCA cable. Either are as common as dirt.
If the radio has something other than RCA jacks, all bets are off, and we’d need to know the brand/model of the radio, and ideally, see a picture of the input jacks.
Maybe a DIN-type socket. Does it look anything like this: http://freespace.virgin.net/matt.waite/resource/av/din5a.htm
I actually haven’t seen it either, but that looks about like it was described to me. Thanks! If anyone else has any other ideas, though, still feel free to share them.
gotpasswords, thanks for the info, but I know it isn’t that modern of a setup. I can’t get pictures until probably the weekend. I can find out this evening the exact make and model.
Really old tube type radios may have binding posts, pin jacks, or even banna plug jacks.
CAUTION: Make sure as to purpose of any existing jacks!
If needed new internal input connections could be made. 
ADDENDA: Old radios in the big hurniture style cabinets did NOT have “Sound Cards/Adapters.”
The sound detector/amplier was an integral part of the circuitry.
It definately sounds like a DIN-connector. They used to be quite common where I live until the eighties.
If you get an adapter cable it wil still work. It will also give an audio out signal. You can still use it with modern audio in / out as long as you have the right cable.