Stylus-Drag..Fact or Fiction?


Most audiophiles can't seem to believe that a tiny stylus tracking the record groove on a heavy platter could possibly 'slow-down' the rotating speed of a turntable.
I must admit that proving this 'visually' or scientifically has been somewhat difficult until Sutherland brought out the Timeline.
The Timeline sits over the spindle of the rotating disc and flashes a laser signal at precisely the correct timing for either 33.33rpm or 45rpm.
By projecting these 'flashes' onto a nearby wall (with a marker attached)....one can visualise in real-time, whether the platter is 'speed-perfect' (hitting the mark at every revolution), losing speed (moving to the left of the mark) or gaining speed (moving to the right of the mark).

RAVEN BELT-DRIVE TT vs TIMELINE 
Watch here how the laser hits the mark each revolution until the stylus hits the groove and it instantly starts losing speed (moving to the left).
You can track its movement once it leaves the wall by seeing it on the Copperhead Tonearm.
Watch how it then speeds up when the tonearms are removed one by one....and then again, loses speed as the arms are dropped.

RAVEN BELT-DRIVE TT vs TIMELINE
Watch here how the laser is 'spot-on' each revolution with a single stylus in the groove and then loses speed as each additional stylus is added.
Then observe how....with NO styli in the groove.....the speed increases with each revolution (laser moves to the right) until it 'hits' the mark and then continues moving to the right until it has passed the mark.

Here is the 35 year-old Direct Drive Victor TT-81 turntable (with Bi-Directional Servo Control) undergoing the same examination:-
VICTOR TT-81 DD TT vs TIMELINE 
halcro

Showing 4 responses by rauliruegas

Dear @mikelavigne  @phoenixengr :  """  measurements are important. and i do agree there is a relationship with turntable performance between measurements and performance. but no matter the measurements the final arbiter is our ears.  """

yes, that's true but depends the ears of who and I mean the expertise of those " ears ".
Trhough the years your " ears " were exposed to the best of the best audio systems other than your own " dream " system so the validity of your opinions are different of the validity of mines.

In the other side the ears of any one of us were exposed to live events in many different ways that made it that each one of us be biased in different way.
When I attend to live music events ( I do often. ) I like to seat at near field position, not always but around 75% of times and when I seated 5 rows back the experience is really different and if I go 10 rows back even more different.

Maybe that's why for me the attack/transient response is so critical and the reproduction in a home audio system tell me a lot of that system. I remember that you posted/told me that overcthe time your home seat position listening to your system " bit by bit " get closer/near fierld to the speakers and that's a good thing for me but normally people do not listen at nearfield position so are biased in different way and with different sound/music reproduction priorities.

All those is full of sujectivity more than objetivity/measurements. But as you said measurements are important.

A problem with measurements is that are not in precise way measuring what we " listen " to tell us why we are listening what we listening. This is very complicated to do it because in a scientific way/explanation everything we listen can be measured IF we know what and how measure it and till now I don't know any mathematic model that can do that. So we have to trust in our " challenged " ears and that's why the learning ladder of our ears is a very long one with " hundreds " of steps/treads.

In his first post to you Phoenic posted:

""" 
and makes you a hobbyist, not a designer   """

and that's what you posted in your wide explanation about: we are hobbyst/audiophiles and certainly not designers but the technical knowledge levels of gentlemans like Phoenix always are welcomed because is good road for all of us to stay growing-up.

R.

Dear @jtimothya  :  """  Dynamic transients have more initial impact with a more speed accurate table - less blur at the launch edge. ""

Yes, that's one of the reasons about, other is that any kind of vibrations generated by the analog rig are better damped/controled.Transient accuracy and speed is where the sound of music strats followed by the developed harmonics. It's the " engine " of music reproduction in home.

@mikelavigne  said: """  the Saskia has amazing energy, images more holographic and astonishing tonal density. more weight and impact to the bass... """

that comes from that transient accuracy/speed and very good controled vibrations throug the analog rig.

In the other side I don't think that differences in betweeen the Saskia and NVS TTs been really high but only differences on some important characterisrtics of the performance that goes more with Mike priorities but this is only my " imagination " because ML is a true expert audiophile and music lover and he knows.

R.
Dear @richardkrebs  :  "   This is a whole different topic. ", yes diferent but with direct relationship with " audible "/or not speed deviations that we " charge  " to the TT culprit when maybe not always came from the speed unstability in the TT.

Perhaps we need a recording engineering to answer the question, that I remember in this moment Atmasphere has enough experience about and maybe he could chime here on it.

In the other side:  "  TTs dynamic speed accuracy. """ M.Lavigne posted about " steady " as the critical issue and yes this is the main subject with any TT.

In your example if both TTs are " steady " we can't be able to detect it and maybe we can't even if not steady because speed difference is so tiny.

R.
Dear friends: I would like to know if each single LP was recorded/cutted at exactly/accurated 33.333..rpm and if for any reasons exist tiny deviations from 33.333..rpm accuracy why or how can we or not detected through an accurate TT that spins at exactly 33.333...rpm during play time of LPs? 

I think that some one can put some light about.

 The stylus-drag is a fact and can be fixed but those tiny differences in speed/pitch always comes by speed non-accurated TTs or by the LP it self?

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.