You can get an ABX Comparator so you can do your own double blind tests.:)
Adding a second turntable
I want to add a second TT to my system and am using a Audio Research LS25 Line stage preamp with a AR PH3 SE Phono Preamp. Do they make a A/B switchbox that I can put between my phono preamp and the two turntables so I can select which TT to play and don't have to keep changing cables when I want to change TT's.