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
Ralph, though you express your own opinion, I think that you misinform some people. You did say that there were many tables that you had not heard. Why would you choose the Technics before auditioning all of the top tables? And tonearms. And cartridges.
I base a lot of my assessments on an LP that I recorded (Canto General- using two different tape machines, an Otari and a modified Ampex 354 tube machine). (FWIW I feel that the Technics needs a different platter pad and plinth to really show its stuff).

Since I was there and have the master tapes, I have a pretty good idea of what the LP is supposed to sound like. I've heard plenty of 'tables; the closest I've heard that does Canto General properly has been the Technics SP-10 MkIII equipped with the Triplanar 12" arm (of all the arms I've auditioned, the Triplanar is one of the very few that gets everything right). I've found that the cartridge choice is less important if the arm tracks the cartridge properly and the phono preamp is stable.

I do concede that when I see a machine that ignores what I see as basic engineering principles with regard to playback, that I will be prejudiced about that machine. So I am far less likely to even audition it. I've learned that from using about 30 different machines at shows. Its not worth the frustration of getting things to sound right if the 'table isn't based on sound engineering.
As I said, according to Ralph everyone with good hearing and sense should go after the Technics and Triplanar arm. And don't forget about Atma-Sphere amps and Classic Audio speakers. Everything should be wired with Mogami cables, of course. That's the current state of the art. Yeah, that's how you lose competition not win.

Yes,  and perhaps more often built to a price point jeopordizing performance potential.  
Yet, there are those who gave up their Walkers and other high end tables and use highly modified Technics SP-10 MK III while claiming this set-up's with various arms and cartridges superiority. I would be happy to compare if I could. Most likely outcome is that it would be different with the advantages and disadvantages of either, and also a matter of taste and the synergy of the entire chain. At the highest level I believe you have to match everything, including turntable to speakers. The system should work in complete oneness. This would take enormous effort, but that's the only way. Science is science but art goes beyond it.
inna,

I think that almost everyone on these forums, think that they are applying science and art to their system at whatever level they are at.

Few mention that they are new to this hobby.

Fewer mention that they are wannabes.

 I mostly agree with your comments. But, unless you have your Studer and have it fine tuned/ calibrated and your tapes match the calibration of that Studer; your almost in the same boat as the TT / vinyl people. I may be wrong on this point; perhaps you or Ralph can comment and clarify.

 I will still wait for the Technics 10R.

It would be great if you would post your system with pictures. Help us visualize. 

Thanks and Best