Turntable speed accuracy

It seems like none of us read each other's posts, except Raul and DT, so that they can reach immediate disagreement. A century ago an American writer named Ambrose Bierce defined "conversation" as a social interaction wherein I wait for you to finish talking so I can say what I want to say. In any case re turntables, DT is right. The first job of a tt is to get speed right. Raul used to argue that a phono stage that does not do riaa within 0.1 db is fatally flawed. You can't have it both ways, Raul.

Dear Lewm, disagree. I think they read the posts but they understand it in a different way as you, me or others do.
This is not because they not only have a more sensitive scope but maybe they have a more sensitive feeling too when reading each other`s post.

Nevertheless I do think in this topic we are all not far away from each other. We all agree that accurate speed is an important condition or precondition for enabeling a good sound quality.

Of course there are other factors having also an impact on good sound quality, the bearings quality (e.g. air based or other quality attributes), the motor´s quality (maybe also fly wheel or more motors), the platter`s quality (material, weight, air lips) the belt, thread or idler wheel`s quality, and last not least the interference and the implementation of all these turntable parts. Enough stuff for some more threads...

best @ fun only

I found the owners manual online for Adjust+ and some reviews. As I surmised the low pass filter is set for 0.56Hz to eliminate record runout. I was considering drilling the center hole out a few tenths of a millimeter on my test record, but I began imagining what a catastrophe that would be me loose with a hand drill with one of my precious records. Fortunately this iPhone app cancels out the record runout for you. Pretty cool app.
Regarding the tt bearing: I do my own maintenance on my tt. Periodically I breakdown the tt and clean the main bearing. I re-lubed last time with a synthetic grease. I think it made the tt sound better. Anyone else had that experience? I have never touched the motor.

Bearing lube for dd turntables is yet another controversial subject. Fortunately, the rotation is so slow and relatively low stress that almost anything will do to prevent bearing damage. One guy who restored my L07D insists on only a certain weight of a certain racing motor oil. I am sure it is overkill.

when it comes to bearings/ motors and platters I see a difference between the vintage designs and most of the modern turnables. The  service principles say I need to lubricate the EMT' s bearing every year, oiling the motor once in years. Introduced in 1951, the EMT 927 is a massive turntable with an aluminum chassis,  meassuring  6 7. 5 x 52 x 21 .5 cm with a weight of 80 pounds. The platter has a diameter of 44 cm and sits in an amazing precision ball bearing. The bearing shaft is 16.6 cm long and has a diameter of 2 cm! The motor itself is massive. It looks like an industrial motor, 13.5 cm in diameter and 20 cm long! It is a 3 phase synchronous type with phase shifter.

The big MS designs have an oiled, capsuled bearing which should keep a man's life. The massive platters have a weight of 40 to 50 pounds, the full table up to 170 pounds. The Micro Seiki motors are very precise (with a competent controller) as the Continuums motor is as well, a linear 3 phase AC-24V DC Brushless design with integral optical decoder. You need looking at these parts to get an understanding why the usual small motors used for todays TTs are a joke! The Continuums platter has a weight of 60 pounds. I have put an image of the self lubricating bearing on my page to show the difference.

I do understand when Dertonearm questions the quality of new developments against the Micro Seiki, EMT or Continuum standards. In all the mentioned designs the mass does its job with inertia and resonance control. All that makes for a very good turntable in my opinion. And in all designs precision is of importance. 

best @ fun only