Sony DTC-690 Digital Audio Tape Deck Player/Recorder Inputs: Analogue: phono (x2) 47k Ohms, -4dBs Digital 1: phono (x1) 75 Ohms Digital 2: Optical jack Outputs: Analogue: phono (x2) 470 Ohms, -4dBs Digital 1: Optical jack - wavelength 660nm