No you can't. The Beomaster 6000 however has an input for the 4 channel record player but the Aux socket is switchable so that you can use a stereo record player. This input has a switchable RIAA built in.The BM3400 has a similar set up though one swaps between the two inputs using a button under one of the sliding lids.

If you are using a Beogram 6000 with other Beomasters, you use either the Aux or Tape input.