If you have a phono preamp; just want to listen; and don't care otherwise; you could just run a pair of cables between the phono preamp and the soundcard line input. The cable (from RatShack) would have a pair of male RCAs on one end and a small headphone jack on the other.
Ratshack might still have those $30 battery powered phono preamps if you need one.
Ratshack might still have those $30 battery powered phono preamps if you need one.