Buy Mono vs. Stereo LPs for Stereo Rig

Oh, and I should add that I have an outboard phono preamp. I assume that I should place the double Y adaptor device between my phono preamp and my linestage preamp?

Like life, it depends and is complicated. Mono LP's are best played in a 'chain' that is 100% mono, meaning the cartridge must be mono, cable mono, preamp mono. Once you have the sound in the preamp, you can take the output to two channel via a y connector. All else compromises the effect.

Agreed Bucanero! But I'm looking for a compromise solution for those who don't have a separate mono rig.

I have a stereo system but have a mono cartridge on an extra wand for my Graham B44 (see system). I find with a mono cartridge that the music seems to flow better, be more involving and to have better definition on mono records than my stereo cartridge whether my ARC Ref3 is in stereo or mono mode. I have some pre 60's Jazz and other mono records but do not play them. I believe they require a different needle profile, EQ and can be damaged with what I have. One day I will add an arm pod for another arm and cartridge or even another table with a different phono preamp for records not setup for RIAA.

As a life time collector of LPs who started collecting in High School back in the 50's, I have tons of great mono records ... mostly jazz. I've found that Audio Technica's OC9-MKIII, even though its a stereo cartridge, plays mono records superbly. I love that cartridge on mono records. So much so, that many of my audiophile friends say ... "Who needs stereo?"