You can use the method Dougdeacon described and look up the chart at the bottom of the FAQ posted on the VDH web site. This FAQ also contains over 200 Q&A covering almost everything related to vinyl playback, some of them are quite insightful.
http://www.vandenhul.com/artpap/phono_faq.htm
http://www.vandenhul.com/artpap/phono_faq.htm