3 New UBER Decks - Is this Turntable's SwanSong? 🦢


Michael Fremer has recently reviewed three new turntables designed to be the 'Last Word', 'Cost no Object' STATEMENTS!!!!........Do I recall hearing this claim before??
I love Mikey and have followed (and trusted) him for decades.
He has been the longest and foremost published 'champion' of the superiority of vinyl (uber alles) in the world.
I am thus ecstatic that he has been able to listen and compare these decks in his own room, with his own equipment virtually side-by-side
It's almost a 'given' that he will be the ONLY person on earth given that privilege....

So what Mikey HEARS.....is indisputable

Given his 'character' and desire for accuracy and honesty.....years ago, Mikey started including some 'objective' measurements in his turntable reviews.
These measurements were done utilising the Dr Feikert PlatterSpeed App which has since been discontinued.
As the App only worked with the Mac iOS of many variations ago.....Mikey has kept an old iPhone which can still operate the App.
The PlatterSpeed App had a few technical limitations.....
Foremost amongst these, was its dependence on a 7" record with an embedded 3150 Hz Frequency track to produce a test-tone which the App could process through its algorithm to produce the graphs and all the corresponding numbers.
To stamp hundreds of 7" discs with perfectly 'centred' HOLES is a nigh impossibility.
It's almost impossible to do it with a 12" disc!!!

This means that ALL the figures produced in their Chart Info are dubious and mostly UNREPEATABLE!!!!
I have Chart Infos for the same turntable/arm combination but with the 7" disc moved slightly producing different figures.
I even have Chart Infos produced with the same turntable but different arms ALL with different figures (the arms are in different positions surrounding my TURNTABLE).

So what is my point......?
The GRAPH produced with the PlatterSpeed App is accurate and USEABLE when looking at the 'Green' Lowpass-Filtered Frequency.
If the hole was PERFECTLY centred.....this 'Green' line would be perfectly STRAIGHT......but only if the turntable was maintaining its speed PERFECTLY.
The wobbles in the 'Green' line are due to the hole's eccentricity as well as any speed aberrations.
So the best performing turntables are those with the most constant and even wobbles approaching as closely as possible a STRAIGHT LINE.

Now the SAT Direct Drive Motor is actually the same as Technics developed for their latest SL-1000R except with some bespoke modifications.
It appears that SAT have corrupted what is a very good DD Motor unit....🥴

Mikey says that the OMA-K3 produced the best PlatterApp figures of any turntable he has tested 👏
Does this mean that the OMA-K3 is the most accurate turntable of these three decks.....or maybe of ALL turntables?

Mikey can't (and won't) test and review products from the past which are no longer produced because that's not his job!
But wouldn't it be great if someone WOULD review products from the past against the modern equivalent?
Classic turntables with reputations....gravitas...like the legendary EMT 927 and Micro Seiki SX-5000 and SX-8000.
And what about the NOW lauded Japanese DD Turntables from the '80s...the 'Golden Age' of Analogue?
  • Technics SP-10Mk3
  • Kenwood L-07D
  • Pioneer P3
  • Victor TT-101
  • Yamaha GT-2000
Because we know that Direct Drive is now 'Flavour of the Month' for the new Uber Decks due to their superior speed accuracy....a 'Flavour' that started with the legendary Rockport Sirius III.
But what about Belt-Drive units like my 20 year-old Raven?
So much for science and technology.......

We can do things today that were only dreamt of even 10 years ago
Except learn from history, harvest experience, expertise and craftsmanship......

Here endeth the Sermon for today 🤗


128x128halcro
The emperor’s new clothes and not very pretty at that. The OMA gets my vote for winning the ’ugliest turntable’ award, the SAT for ’most overpriced’, the TechDas for ’most over engineered’. The fact that these products exist and apparently satisfy a demand says something about the current state of our society, does it not?

These are just trophies for the rich, who probably couldn’t care less about performance. It won’t bother them at all if these contraptions don’t have better speed accurancy than ’normally’ priced (for us!) turntables, or even turntables built decades ago. Same ’logic’ as 100k wristwatches I guess.

It puts a new ’spin’ on the closing words on Zappa’s Lumpy Gravy: ’cause round things are boring’......


These reviews are mostly purely subjective, and as such makes comparison subjective.  Here is an objective review of a Wheaton Tri-Planar II Tonearm circa 1988 -  Wheaton Tri-Planar II Tonearm (Jun. 1988) (gammaelectronics.xyz).  30-yrs ago, this type of review was common.  Some called foul upon this level detail which was valid in the days of the amplifier wars; others have since lost interest in this level of detail. 

Some of these uber tables have impressive amounts of engineering, but they have yet to correct the spindle hole centering issue that the Nakamichi table Nakamichi TX-1000 on thevintageknob.org tackled years ago.  But Technica is probably the only company today with the resources that could tackle that problem.  Although the complexity of the Techdas indicates that they also may have the resources.  

So, far from a swan-song for the 'ancient' turntable.  If vinyl sales continue their trend, and money continues to spare no expense, more 'advanced' turntables are sure to follow.
Mikey basically said, in so many words,  that the Air Force was dull and plodding. Not what I want from that outlay. I heard one at XPONA through $250k speakers and it was a mediocre experience for me.

My record collection is increasing in value at a far better rate than my 401k! Records and turntables are not playing any swansongs.
Does this mean that the OMA-K3 is the most accurate turntable of these three decks.....or maybe of ALL turntables?
No. it may mean it has the best speed stability and accuracy to an absolute reference figure. But not necessarily the most accurate reproduction of the master.
Noromance, but “best speed stability, etc” and “accurate reproduction of the master” are two very different criteria. One is scientifically measurable and the other is inescapably a subjective judgement. However to reach the latter goal wouldn’t you want to have reached the first goal (absolute speed stability) along the way?

Henry, thanks for pointing out the issues with those graphs that MF likes to publish.
Glory hellaylulah.
I truly believe that Mikey hears stuff that I can't.
Blessing or curse?
@lewm
One is scientifically measurable and the other is inescapably a subjective judgement.
I was implying frequency response, resonance and noise suppression etc. I assume they too are measurable.
Dear friends : Through the years I learned to read MF reviews with some " salt " where to really know what he listened or like it I have to read in " between " lines.
Here the Rega RP10 and SAT reviews:


https://www.stereophile.com/content/rega-planar-10-turntable-rb3000-tonearm-apheta-3-phono-cartridge...

https://www.stereophile.com/content/analog-corner-304-sat-xd1-record-player-page-2

and this is his point of view comparing in between TTs performance with not only a wide but way wider difference in the TTs price:

"""  The XD1 shares some sonic characteristics with Rega's revolutionary RP 10 turntable: ultrafast, clean transients throughout the audible frequency range; tight, fast bass; revealing midrange transparency; and overall sonic stability and focus. All these characteristics result, apparently, from careful attention paid to structural rigidity and the removal or prevention of unwanted vibrational energy. ""

But in both reviews he does not posted " something/problem " he was aware due to what we look on both charts.

So the question about that speed measures and chart is that in reality has a real value for us when listened in our each one system or if in reality is useless due that this " excercise " is only a small part of all the overall analog imperfections that impedes to isolate one single characteristic.


""  The fact that these products exist and apparently satisfy a demand says something about the current state of our society,... ""

yes and other that the spended money by the owners the real " true " is that all were " deceit " by the AHEE because the design and manufacture of a TT is not a rocket science and we all can see that through many years there is nothing new about: turntables still are turntables but just more expensive units.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.






I'm surprised he found room in his basement for three decks. Maybe converted the hot water tank to on-demand?
@antinn thx for the link to Triplaner review. An excellent arm that has been improved since. Wish the panel had listened to it w Accuphase also.
The glaring flaw here is Mikey is no longer accurate with his 
opinions. Good  digital has not only closed the gap but has surpassed turntables in many areas .a turntable for example is very limited in Dynamics,Low Bass ,noise levels S/N ratio ,Dynamic range and only capable of 12.5 bits.  And digital is still progressing Today finally for $10 k or under digital surpasses analog , and as a Huge bonus no more having to clean ,replace cartridges,needles, and Millions of songs to choose from .
I owned several very high quality turntables ,10 years ago and then 
Turntables had a bug Sonic advantages .today  no way I would 
consider the hassle ,when dollar for Dollar Digital gives much more 
on average .If you want to spend $40k on a turntable enjoy it it sounds great , but tor Thst kind of monies Digital can do more 
on many levels . 
I don’t have a problem with Mikey’s reviews of these three turntables....
He doesn’t pronounce a ’winner’ and he treads a diplomatic path between all three which is understandable considering the huge costs each manufacturer bore in relation to delivering, unpacking, assembling, disassembling, re-packing and transporting these beasts.

None of them would be happy to receive criticism for their troubles....🥴
Mikey basically said, in so many words, that the Air Force was dull and plodding.
No he didn’t!
.....he’ll be disappointed that I DIDN’T write that "the K3 blows the fat, sluggish, energy-retaining AirForce Zero out of the water."
If one reads between the lines of his conclusions.....you wouldn’t imagine that Mikey will be trading in his beloved Continuum Caliburn, although I wouldn’t be surprised (given his relationship with Marc Gomez) if he added the SAT XD-1 to his listening room 🤔

Just for the record....if Mikey claims that the OMA-K3 produced the BEST speed and wow/flutter figures of any turntable he has ever tested...

CHART INFO OMA-K3 

CHART INFO VICTOR TT-101 

Then the savvy engineers at Victor in Japan, managed to produce a better turntable 40 years ago!!!! 😂

OMA states on their Website:-
The design of K3's mechanicals is the work of a team led by Richard Krebs in New Zealand, the world's foremost authority on direct drive turntable technology.
Perhaps a Footnote is needed:-
Assuming all the Engineers at Technics, Victor, Pioneer, Yamaha, Kenwood et al are now deceased?
You vinyl junkies do know that WAYYY back,sometime early 80’s,that "guru"Fremer DID NOT EVEN OWN A TT & in Stereophile magazine STATED DIGITAL WOULD BE KING!!!
Back in the day when I was selling stereo equipment putting myself through school, we had both a Revox A700 and B77 in the store. Also sold B&O. I slummed with an Ariston RD11S at home with a Grace arm.

the Revox decks had substantially more “slam” and sense of dynamic realism than vinyl did. I think of how much better sounding those decks were with the few recordings we had in the shop, and wonder to this day why folks spend hundreds of thousands on elaborate mechanical devices to play such a seriously flawed media as records. Tape is better…

And I throw my hat in with the digital streaming folks for bang for the buck and most realism. It’s a far cry from 10 years ago…
@
jallan"to this day why folks spend hundreds of thousands on elaborate mechanical devices to play such a seriously flawed media as records. Tape is better"…hahahaha,I remember in about 1981 being thrown out of a Linn dealer in Larkspur Landing,Cali.for commenting on how bad the snap crackle pop was on some god awfully expensive tt set up compared to the then new Marantz CD63..
"And I throw my hat in with the digital streaming folks for bang for the buck and most realism. It’s a far cry from 10 years ago…"100% agreed!It has taken some 20+ years but pure Class A solid state & digital media have replaced tubes for me & never did like vinyl..
Oh regarding my comment on guru Fremmer I’m talking late 1980 early ’81 when he first came on with Stereophile.He was new,digital was new,Marantz was making a cd player that actually made music & he was emphatic about digitals supremacy..Dig around in the Stereophile archives,I bet it’s still in there somewhere..
@halcro There's a number of times he mentioned a bias to the lower end. And others where finger clicks were muted and brass wasn't bright. Read it again. One thing I have found over the years is that when a reviewer mentions something, you can multiple the effect. 
But wouldn’t it be great if someone WOULD review products from the past against the modern equivalent?

They will never do that in high-end press, it will destroy the strategy of constant price increasing for new stuff. They want to live today without anything from the past (except maybe for old records), “new is always better” in their world. They can’t tell that an old high-end DDs are better (and 100 times cheaper) than some new high-end DDs. Same about cartridges. 
In my honest opinion, beyond a certain point, it is pretty hard to hear a discernable difference between numerous well constructed turntables at a moderate price level. I do not think these uber expensive decks bring as much to the "table" as one is led to believe, except maybe eye candy (subjective) and expensive materials. 
Fremer can chew the fun outta yer gum with unreadable turntable tweaking articles. Makes you wonder why anybody would bother with vinyl, but vinyl is a current unstoppable success anyway (Swan Song? Huh?). Notice Fremer thought the silly Synergistic Research turntable PHT (tiny and expensive metal JuJuBe, do not eat these!) worked great, and then ignored them completely in every review since. You go Mikey!
I met Michael Fremer in the 80’s - he’s a lovely guy, but the reality is he is now 74 years old by my reckoning.
The chances that he can set up a top end turntable accurately is remote.
The chances that his hearing is up to par is not high.

I always remember a comment in Hifi News in the early 80’s - if you have been listening to an amplifier with a narrow dip at 3k for a period of time, then any accurate (flat) amplifier will sound bright, because your brain has adjusted to the imperfections - it compensates.

What I am saying is that Fremers comments are conditioned by hs own historical imperfect equipment. Unless you have been listening to the exact same equipment for the same amount of time, then his comments are irrelevent in absolute terms - all they are are impressions from someone of whom you have no idea what they are hearing.

Unfortunately, due to reliance on advertising revenue, audio reviews have become like car magazines - advertorials - where only the positives are discussed, and no at length comparisions as in the hey days of TAS.

You only find out about the flaws when the upgrade comes out the following year.
@antinn 


Some of these uber tables have impressive amounts of engineering, but they have yet to correct the spindle hole centering issue

The wow and flutter induced by eccentric records would far exceed the minor deviations in speed of a decent turntable, and most records are eccentric to some degree. Therefore what relevance does .001 or .0001 speed variation really have ?

In my view what you want is stability, and every direct drive I have heard thus far including the SP10mk3, LO7D, Denon DP100M has been slaughtered by my Final Audio thread drive VTT1 - the DD's sound thin, lacking body, are grainy or have a grey wash through the sound, and the Final has been more resolving of low level detail.

In case you think I'm biased, no, my Final Audio VTT1 weighs 300lbs, the AC motor is driven from a sinewave and cosine wave generator, power amplifier, Oracle MIT interconnect and speaker cable and if I could find a single box turntable that sounded better I'd be very happy. By the way the 26kg platter can be brought up to full speed in less than one platter rotation depending on how much torque I dial up on the controller.

My gut feel with historical top end DD's is that error correction servos, like digital, are doing the damage.

I know one well respected top end TT designer who has provided design services for a DD for another top end company and his solution was to provide a soft error recovery spread over multiple revolutions simlar to the Victor 101 error correction system.
They can’t tell that old high-end DDs are better (and 100 times cheaper) than some new high-end DDs. Same about cartridges.
Old cartridges you and I agree on, and I admire your stamina in continuing to repeat this message over and over again on this Forum.
I've long ago given up on offering advice to people who essentially don't want it.....🤭
But the message has obviously gotten out.
When I first began buying old cartridges on EBay 15 years ago.....good examples cost $200-$300.
Today those same cartridges are regularly going for $500-$1,000 so hundreds of audiophiles have gotten the message....even if most of them might be in Japan 😛

And don't forget 'old' tonearms......
People are conditioned to think that 'modern' is better and that 'progress and technology' continually improve things 🤩
It's true for many things like cars and computers but for traditional, well-understood crafts like watchmaking and analogue HiFi equipment, it ain't necessarily so 🤥
Do you really believe a 'modern' Steinway Concert Grand is way better than the same model made 40 years ago?
But the reality is he is now 74 years old by my reckoning.
Hey Dover.....
I resemble that remark 🥴
I think you're being unduly harsh on Mikey...
What I am saying is that Fremers comments are conditioned by his own historical imperfect equipment. Unless you have been listening to the exact same equipment for the same amount of time, then his comments are irrelevant in absolute terms - all they are are impressions from someone of whom you have no idea what they are hearing.
Well that's the same for ALL audio reviewers.....
If you don't read reviews because of this, that's your business.

After reading Mikey's reviews for 30 years or so...I think I know what his preferences are and he never makes a secret of them.
I also knew the preferences of the much-lamented Art Dudley but I don't feel the need to buy an idler-drive with Ortofon arm and SPU cartridge.
Nor do I need to buy Shindo amplification and DeVore Fidelity Orangutan speakers to appreciate his reviews and intimate writings.

I also believe I know the preferences of Jonathan Valin and Arthur Salvatore better than those of Harry Pearson and I enjoy reading ALL their writings.
I pity you if you choose to ignore interesting opinions and writings 😢

I have heaps of respect for all that John Atkinson has done and achieved in this hobby of ours.....but I don't read his reviews simply because he doesn't listen to vinyl!!!
He cannot hear the same way I do so his views are irrelevant to me...
I DO however, read his technical tests 👍
+2 audioguy85, you're damn right.

No need to spend $$$$$$ on a turntable  You can have perfect performance for £10,000, maybe less.  All the extra dough just buys you bling and a lot of overweight metal.
Old cartridges you and I agree on, and I admire your stamina in continuing to repeat this message over and over again on this Forum.
I’ve long ago given up on offering advice to people who essentially don’t want it.....🤭
But the message has obviously gotten out.
When I first began buying old cartridges on EBay 15 years ago.....good examples cost $200-$300.
Today those same cartridges are regularly going for $500-$1,000 so hundreds of audiophiles have gotten the message....even if most of them might be in Japan 😛


Haha, gotcha :))

And don’t forget ’old’ tonearms......
People are conditioned to think that ’modern’ is better and that ’progress and technology’ continually improve things
It’s true for many things like cars and computers but for traditional, well-understood crafts like watchmaking and analogue HiFi equipment, it ain’t necessarily so.

Finally, I decided to upload the gallery of my modern and vintage components in my virtual system page, If they will not limit me technically there must be tons of pictures showing the evolution of my system. I upload pictures everyday. I want to show people that vintage high-end stuff is cool in a combination with modern analog gear.
@halcro 
I do not "not read reviews" or "ignore interesting writings" - I am saying you should take them as guides only, not gospel.
I am not being harsh on Mikey, I'm 61 - I know my hearing is good - 18khz at my last hearing test, and reasonably flat, in other words no sign of hearing damage - but I know that my set up skills take a lot longer than 20 years ago and I need natural light to do it accurately. I dont expect to be the same at Mikey's age.
Yes, if you follow someones writings you get a grasp of their preferences, but you still dont know what they are hearing. 
I tend to check the reference systems as well to triangulate their opinions. For example, if a reviewer is using gear that I've heard and dislike, then I put less weight on their opinion as it relates to potential purchase decisions for my own system.
I enjoy Fremers writing and I know from my own knowledge of the gear he uses that I am familiar with that he is pretty reliable.
Art Dudley I enjoy reading, but cant stand Devore Orangutangs, SPU's and vintage arms that sound thick and turgid.
HP was great up until he lost interest around the time his boyfriend did a runner, the fire at Seacliff, and the advent of digital.
Robert Greene was a great reviewer.
And yes I enjoy Arthur  Salvatores writing.
Martin Colloms excellent, Ken Kesler overrated - he gets enthused about anything.
I have owned very nice digital systems and currently own a very nice vinyl system. I love both formats. You can check more boxes with digital. This still comes down to personal preference.  What do you like? Regardless of all of the technical talk and measurements; what brings out emotions (goose bumps) when listening??? 

For me, I still prefer analogue. My vinyl rig sounds exceptional... 
Dear friends : @dover  said: "   what you want is stability..." and he is totally rigth because the most important characteristic in a TT is speed stability.

Btw, that his Final TT " slaughtered " all those DD TTs is just his opinion. It's like talk with a tube lover about SS electronics, obviously that for him tubes " slaughtered " SS alternative.

He said too:  ""  My gut feel with historical top end DD's is that error correction servos, like digital, are doing the damage. ""

Obviously that's a " feeling " and here we have to remember that all the record cutting machines motors ( Technics between them ) used servo control. So if this servo correction is the problem why is not " reflected " in our LPs during play. 
I own and owned DD/BD and I can remember to identify that  "  DD's sound thin ...."
I think that's all about the whole room/system performance and not because the DD servo. servo.

Here 2 different interviews to MF:


http://highfidelity.pl/@main-250&lang=en

https://www.monoandstereo.com/2013/06/exclusive-interview-with-michael-fremer.html



R.
Also, to the argument about servo devices and their effect on sound quality, most upper end belt drive turntables these days employ some sort of mechanism that senses platter speed and feeds back to the motor for speed correction. Why is this harmless with belt drive turntables and yet an Achilles’ heel for direct drive turntables? Of course, I do not know whether Dover’s turntable uses such a speed correction device.
Why is this harmless with belt drive turntables and yet an Achilles’ heel for direct drive turntables?
Because the belt acts as a filter of sorts and the bearing is free of an integrated motor.
@freediver who was the Linn dealer in Larkspur Landing in 1981?  Access To Music moved there from Mill Valley around 1993 or so. 
OMA states on their Website:-
The design of K3's mechanicals is the work of a team led by Richard Krebs in New Zealand, the world's foremost authority on direct drive turntable technology.
Perhaps a Footnote is needed:-
Assuming all the Engineers at Technics, Victor, Pioneer, Yamaha, Kenwood et al are now deceased?


This is a good point. Personally I never heard about any Krebs product, except for his modification of Technics SP-10mkII motor on this forum. Is there anything else Richard Krebs actually made? 


I know my hearing is good - 18khz at my last hearing test, and reasonably flat.
Good grief @dover ....that's amazing!
Mine cuts out at about 11K Hz....🙉
No wonder you can hear things on my YouTube videos that I can't!!!
The chances that he can set up a top end turntable accurately is remote.
The fact that you pick on the only man on earth who actually makes a 'living' selling his vinyl setup videos is ironic..🤥
For twenty years I had a Rega Planar 3 with Hadcock GH-228 unipivot tonearm.
If ANYONE can successfully master the adjustments on the GH-228 tonearm......everything else is a piece of cake 🤗
The Continuum Cobra and Copperhead arms are both PITA to setup for different cartridges and certainly not appropriate for a reviewer to use.
I think that's the main reason Mikey changed to the 4-Point and then the SAT.

After setting up dozens of cartridges.....one can become quite adept at it.
After setting up hundreds (as Mikey and I have done).....proficiency is not in doubt 😂
I've watched Mikey's setup procedure and don't do mine the same way...but then all of my tonearms (except for the Copperhead) have detachable headshells.
I certainly DON'T follow his USB microscope torture for SRA of 92 degrees.
If you can't HEAR when the VTA sounds best...you shouldn't be setting up a cartridge at all!!

I am the same age as Mikey, with good eyesight and steady hands.
I can setup cartridges whilst I chew a sandwich, talk on the phone and watch CNN all at the same time 🙃
Doehmann Helix-1 … has been reviewed by Mike.

Mark Doehmann was involved with design of Continuum Caliburn
@gordon:crap maybe it was the early 90’s,everything but the last 10 years is pretty much a blurred image..
Best of my memory is that he & Julian Hirsch had a big brew ha ha about M.F.’s apparent flip of camps from digital to vinyl..
...tell me when and where to send the flowers....there's only so far one can take the 'system', as 'magical' as it can be.  JMHO....
@antinn, great example of a proper review. Now if all tonearm reviews were done that way we might be able to draw some meaningful comparisons. My only complaint is that the V15 was too compliant for the Tri Planar. My own experience with damping brushes was frustrating at best. 5 Hz is too low in everyone's book. No wonder bass performance suffered. Not sure how they crammed a Tri Planar on a Sota. Donna insists it does not work without significant modification but maybe that is just the more current versions.

I am going to agree with audioman85, dover for the most part, clearthinker and rauliruegas. 

I am not so sure that vinyl is here to stay. Most of us older audiophiles have large record collections which makes owning a turntable mandatory.
The people around at the time record sales exploded are now older, their kids are on their own and they have much more money to burn. While it is true that some young people are getting into vinyl, far more are getting into digital. I won't be around to see the outcome consequently I really do not care. If I did not have any records I doubt I would buy a turntable on the other hand people who point at all the problems with vinyl reproduction have obviously not heard a top notch turntable with a modern stylus profile set up correctly playing a clean record. It always amazes me how good this can sound.

IMHO the Nak TX-100 was overkill in the extreme. Typical Nakamichi. Shifting the center of the platter is going to alter it's balance which in time will do a number on it's main bearing. Many of us laughed at it. Off center records are a problem and can be quite audible. My solution was quite simple. I returned the record as defective, and kept returning them until I got a copy that was decent. 


Re speed stability.
As has been noted, the numbers produced by the platter speed app vary from test to test. This depends upon how the tester placed the record on the spindle, there is a small amount of clearance, so the record can appear to have different amounts of eccentricity each time it is placed on the platter. Also it depends upon when the test is started relative to the point at which the arm is swinging in and out due to the eccentricity. There will be a different reading if the test started when the arm was at mid swing compared to if it was at the inner or outer extreme. You can see the impact of this on the green trace at the start of the plots. Some show an uptick or downtick at the zero second mark due to the arm being at or near full excursion, (AF0, XD1, AC-2, 1000R, K3), where one is neutral with the arm’s swing more or less at its mid point (TT-101).This biases the low pass numbers in favour of the TT-101. The length of time the test runs also impacts on the final outcome. Then there is the low pass filter that is applied to the raw data, this designed to remove the impact of the records eccentricity. It is somewhat a blunt instrument in that it also removes key data about the platters micro speed stability within each revolution.
It is possible to do multiple tests and pick the best or worst numbers to highlight whatever point you are trying to make.  A reasonable conclusion is that beyond a certain point, the numbers produced are of interest but are not particularly robust data.

But what is pretty consistent and robust from test to test is the yellow trace. (amplitude aside as mentioned above due to record/spindle positioning) The platter speed app is interesting in that it first plots the CARTRIDGE OUTPUT as a function of frequency with respect to time.
In a perfect world where the signal generator sent a constant 3150hz to a perfect cutting lathe, we stamped a perfectly concentric record and played it back on a perfectly speed stable TT, we would see the yellow trace as a straight line at 3150hz
But of course, this is impossible and one of the major deviations from perfection is that the record spindle hole is not in the centre. So if all other parameters were still perfect and we considered a non concentric record, we would see the cartridge output a clean sine wave, symmetrically centred about 3150hz with a constant amplitude per cycle.  IOW, a TT producing a yellow trace that is a badly distorted sine wave is NOT speed stable, although its speed could average 33.333.  I hope that this is self evident.
The program then puts this raw trace thru a low pass filter to remove the effect of eccentricity, we now have the green trace. But what the low pass filter does is filter distortion as well. This distortion is a graphical representation of rapid speed changes. It is no longer visible and what we are left with is a smoothed average which is used to compute the low pass filtered numbers.

A far more accurate and useful metric of the speed accuracy of a TT is to simply look at the raw yellow trace, ignoring the numbers. How close is it to the ideal symmetrical, clean, constant amplitude, sine wave?  Some of the TTs mentioned in this thread, plot significant deviation from this ideal with quite rapid and frequent speed changes.
Remember that the yellow trace is the cartridge output plotted as frequency with respect to time, any distortion of the sine wave is a change in frequency, thus a change in speed. These speed changes would be superimposed on any music that was being played. With this in mind, I invite you to look again at all of the speed plots

.
On top of this conundrum, the platter speed app does not load the system dynamically since the 3150hz tone is of constant amplitude.  This is a whole different set of  equally important measurements. We do not listen to constant amplitude, single frequency tones.

BTW two of the TT plots posted have a low frequency oscillation with a period of approximately 9 seconds. A low frequency oscillation with a multi second period like this is not uncommon and is very difficult to eliminate.

Cheers,


Thanks, Richard.
Mijo, people like you put Tower Records out of business. That was a joke, but my point is that one cannot act as you suggest these days in the USA due to the dearth of brick and mortar LP stores. The ones we do have are primarily selling used LPs, each of which is unique. I don’t think one could get away with such buyer behavior doing business by mail order. Good story, though.
Technics SL-1200 MK7

   Will last 40 years with minimal maintenance,....yes please. 
   The asking prices for those TTs’ is just astronomical, and overpriced.  Search most expensive audio gear, some of this stuff is mind blowing. 
 
Dear @mijostyn : Then probably have to return all your  LPs:

""  One thing to note is that there is nothing to prevent the eccentricity to be different on the two sides of the record. For example, the record may be perfectly centered on one side but off on the other, or it may be off on both sides but in different directions. ""

What do you think on that?. I found it somewhere.

Btw,:

https://blog.fluance.com/off-center-pressings-on-vinyl-lps-what-is-it-and-how-can-you-correct-it/

Now, in the past I bougth an item to " fix " manually the LP off-center and it works fine. I still have it somewhere and I remember that fix it but you need time/patience to do it and in those times I was more or less ignorant of the developed distortions by the off-center LP hole and a little lazy to fix it. The seller disappeared in short time.

R.
@lewm, I know this is anecdotal but here in Salem, NH we have a great media store, Bullmoose Records. They stock new records and I have never had a problem returning defective records. I buy many records on line. Elusive disc is always very accommodating and as a matter of fact replaced a copy of Weather Report's Mysterious Travelers because it was drilled off center. They also pack their records really well unlike Amazon who just throws them in a box and many get damaged. I try not to buy records from Amazon for this reason. Bandcamp is another interesting site to buy music from. I have had no problems with Acoustic Sounds. I do not buy used LPs and have no interest in it.