The old Grundig consoles did sound and look great. My guess is that the table is directly wired into the receiver or is using the DIN type of plug...which is common in/on early European units. You would need to use a phono pre-amp for a moving magnet or moving coil cartridge, a good inexpensive choice would be one of the ones from Creek. If the table is directly wired into the units amp/receiver, then you should have a pro do the hook-up. If it is using a DIN plug, you should be able to find an RCA to DIN cable at Radio Shack...or on-line. Hopefully others will add their thoughts. Perhaps an AudiogoN member with knowledge lives your area and could take a look at it and give you some advice after seeing the unit.
Best of luck, Jim
Best of luck, Jim