Why do turntables sound different?


Let's consider higher-end tables that all sound excellent. Same arm/cartridge and the rest of the chain. Turntable is a seemingly simple device but apparently not quite or not at all.
What do members of the 'scientific community' think?
inna
Very very good turntables, like other great components have exceptional transparency, which makes them sound more alike than different. 
anvil_turntables
Very very good turntables, like other great components have exceptional transparency, which makes them sound more alike than different.
+1. And I would add that the very best turntable systems sound very much like the best digital.
moonglum,

Visited both of your links this morning. Again, I appreciate your solid information. Much food for thought here. Will definitely help and effect my future decision.

Best to You
Norb
Yesterday I saw the Avid contest again.

Three turntables (Diva II, Sequel, Acutus) same tonearm (SME IV)
and cartridge (Nagaoka MP-150).

It was astonishing agein to here such really significant differences in
performance.

Responding to "james1969"

In terms of TT Bearing Oil, no they are not created equal and I would highly recommend the proprietary bearing oil that George Merrill has developed. 
You and other readers may wish to consult the following:
   Turntable Design 1 http://hifigem.com/turntable-design-1.html
   Turntable Design 2 http://hifigem.com/turntable-design-2.html
   Turntable Weights & Clamps http://hifigem.com/record-weights-and-clamps.html
   The Phono System Chain http://hifigem.com/the-phono-system-chain.html
   Torque Recoil http://hifigem.com/torque-recoil.htmlhttp://hifigem.com/

Just interesting reading from a fellow enthusiast and turntable designer.  Hope some insight can be gained and either confirm or refute presumptions, assumptions, and the like.  Happy Listening!