It used to drive me crazy when some (usually British) reviewers would, in a review of a new table, use a different arm and/or cartridge on that table and a reference table, then purport to describe the differences in sound between the two. Duh! A really good dealer of turntables (Brooks Berdan was, and his son Brian still is, at Audio Elements in Pasadena, CA) will set up the same arm and cartridge on two tables. Yeah, it’s a pain, but that’s how they earn their 40 point margin!