Provided you have a new belt on the PF-800, it should be sonically better than the YP-D71. It was a (roughly) ten year newer design, and Yamaha’s specifications for them put them fairly close – wow and flutter 0.028% PF-800, 0.025% YP-D71; signal to noise ratio -80dB PF-800, -77dB YP-D71. The main reason why the PF-800 should sound better, even if both are performing like new, is the suspension system on the PF-800, which will reduce feedback dramatically: the main cause of differences in sound between good turntables and great ones is usually due to different feedback levels. You may not notice the difference in sound between them with the suspension locked (not working), given identical cartridges, but you’ll definitely hear a difference with the suspension floating. Feedback, and how to cure it, is one of the most common questions on this forum, and a good suspension setup like that on the PF-800 is a great way to reduce it, leading to much clearer sound.
The main mechanical differences between them are that suspension system, and the belt drive. If someone offered me a YP-D71 I’d be interested if they were giving it away, but I’d be prepared to pay money for the PF-800!:thmbsp:
-Don