45 years back there wasn't any hype of playing with arms/headshells and other turntable tweaks.
there was only one standard turntable with stock arm that's it.
there was broadcast turntables that had capability of swapping arms mostly from Shure Brothers.
as to fair demo there won't be any no matter how 'proper' it's demoed. you're listening to the combination of arm/deck and cartridge. on decks with headshell standard mount arms you can simply swap headshells pretty quick to a/b between cartridges, but that's about it.
still not sure whatchya'll talkin'bout.
there was only one standard turntable with stock arm that's it.
there was broadcast turntables that had capability of swapping arms mostly from Shure Brothers.
as to fair demo there won't be any no matter how 'proper' it's demoed. you're listening to the combination of arm/deck and cartridge. on decks with headshell standard mount arms you can simply swap headshells pretty quick to a/b between cartridges, but that's about it.
still not sure whatchya'll talkin'bout.