Most recordings into the late 60's, mono was the preferred format. Very little attention was given to stereo mixes (until for the Beatles, the White Album) and you could tell with the usually terrible mixes. Parlogram Auctions on Youtube talks a lot about Beatles LP's and he recommends getting two "Y" RCA cables plugged together if you do not have a cart for mono records. I don't see the point. I have a nice mono Beatles collection (and others like The Yardbirds, Otis Redding, etc.) and I don't bother with settings. I just play a mono record with my AVR in stereo mode. I suppose if I had a vintage receiver with a mono switch, I'd hit that. Otherwise nope. Comments?