Earlier-Version Notes
If you have a stereo system with an amplifier already set-up, the easiest way to connect a record player to your computer is to connect the computer to the amplifier's Line Out connectors (sometimes also labelled Tape Out, Tape Rec or Rec Out).
RCA connectors on an amplifier. Make sure the record player is properly connected to the phono input (1) and connect the sound card to the Rec Out connector (2).