Technics SL 1210GR2 Turntable

[Balle Clorin]

If they improved the external finish of the turntable platter and the fit of the motor axis with the platter opening, it would be an even better turntable.

You took it a part yourself?? !

 

[Balle Clorin]

HiFI News Side B Track 7 Test Signal - 20Hz- 20 kHz Band Sweep

Technics 1200GR2 + AT-OC9XSH > Ortofon T30 > NAD 1155 MM Phono > NAD 1155 Audio Out > Focusrite Clarett+ 2pre : WAV 16 bit-44.1 kHz
NAD 1155 INFRA FILTER: OFF

Audacity:
RMS test signal: -12.66 dB
Peak of unwanted resonance (8Hz): - 45.4 dB

Peak of unwanted resonance (in the range up to 20 Hz) is (45.4 dB - 12.66 dB) 32.74 dB below RMS test signal

Very good result (good tonearm + good cartridge) not always the peak of unwanted resonance is so low below RMS test sample.

Is it possible to share the wav file
?

 

[Quando]

It's really their expertise in servo/motor that is HDG... "a new reference on this point" (not too crazy in cost)
if they offered these solutions in OEM, enthusiasts or brands more focused on THDG machining etc. could certainly do remarkable things...
(how many poles does this motor have? and weight of the plate?)
(just for example
https://www.brinkmann-audio.de/main.php?prod=bardo&lang=en
or oasis..

in their defense, DIN measurement side...certainly on disk...)

The weight of the plate is 2.5 kg
The bearing, although it has the same construction as in the GR model, is made differently.
The problem is that the MK7/GR/GR2 model uses a very old, but still common, technical solution, mounting the plate to the engine axis. In addition, it is made imprecisely.
The G model has a completely different engine, a much better mounting of the plate to the engine (additional screws) and the additional bearing works in oil. A different class.

 

[JP]

First I've heard of such is in this thread about the various models you refer to, but like I said, have no reason to look for such either. It's a shame if there's a lot of those out there, tho. It just seemed to broad a brush from what I read here.

It’s a reality of the process - the platter is cast, and then machined to true it up, so the placement of the strobe dots is from the mold and thus they’ll never be perfect. As long as the interface and running surfaces are true, it has no impact on performance.

 

[Quando]

It’s a reality of the process - the platter is cast, and then machined to true it up, so the placement of the strobe dots is from the mold and thus they’ll never be perfect. As long as the interface and running surfaces are true, it has no impact on performance.

The problem is that this platter was designed a long time ago. There was no Internet, smartphones, etc. back then. Nobody recorded Technics platters spinning crookedly, even though they were spinning just as unevenly, and sometimes much more, and didn't post the videos on the Internet.
There was also a greater tolerance for less precise workmanship, because the technical level was less advanced
They came up with such a platter design over 40 years ago, the platter became iconic, well-known, recognizable. There is no 1200 model without this platter shape, it is one of the most important recognizable features.

And there is a problem, because it turns out that they can't, or it is unprofitable for them, to make the platter and bearing so that they spin evenly.
They don't care, it's been 7 years since the debut of the 1200GR, and they haven't improved it at all.

 

[Thomas_A]

Hi,
So, which one has the platter that makes the most waves? The Technics from 1:50 or the Continuum Caliburn from 9:16.
For me the machining quality of the platter is identical, I'm not talking about the intrinsic quality of the turntable, everyone knows that the Caliburn is a fantastic high-end. No one will come and say all year long that the Caliburn's platter also oscillates. Many turntables give this impression, of an intoxicating platter, without the information leaking constantly on the net and without it harming their sound quality.

NB: for the Caliburn, don't look at the black disc, but at the chrome platter, it oscillates more than that of the 1200G presented in this video: it's factual

No matter the tonearm swings like a rollercoaster on that LP...the Caliburn much worse but I can't see if this is platter or a very uneven mat.

 

[JP]

The problem is that this platter was designed a long time ago. There was no Internet, smartphones, etc. back then. Nobody recorded Technics platters spinning crookedly, even though they were spinning just as unevenly, and sometimes much more, and didn't post the videos on the Internet.
There was also a greater tolerance for less precise workmanship, because the technical level was less advanced
They came up with such a platter design over 40 years ago, the platter became iconic, well-known, recognizable. There is no 1200 model without this platter shape, it is one of the most important recognizable features.

And there is a problem, because it turns out that they can't, or it is unprofitable for them, to make the platter and bearing so that they spin evenly.
They don't care, it's been 7 years since the debut of the 1200GR, and they haven't improved it at all.

There’s nothing wrong with the interface method itself if executed well. Majority of issues I’ve seen on the legacy units is interference from burrs, which are very easy to take care of.

As for the rest, they don’t really suit people who think it’s worthwhile to obsess about things that don’t matter.

 

[Quando]

No matter the tonearm swings like a rollercoaster on that LP...

The fact that the arm is swinging, up and down, does not necessarily have to be caused by an unevenly rotating platter.

The platter, its upper surface will have incomparably smaller deviations, up and down, than 9/10 vinyl records

 

[morillon]

The weight of the plate is 2.5 kg
The bearing, although it has the same construction as in the GR model, is made differently.
The problem is that the MK7/GR/GR2 model uses a very old, but still common, technical solution, mounting the plate to the engine axis. In addition, it is made imprecisely.
The G model has a completely different engine, a much better mounting of the plate to the engine (additional screws) and the additional bearing works in oil. A different class.

Are you disassembling for a DIY project? ;-))

 

[Quando]

As for the rest, they don’t really suit people who think it’s worthwhile to obsess about things that don’t matter.

The platter should absolutly spin evenly. It is SOLELY Technics' fault that it spins crookedly. They simply produce it badly and don't give a damn

 

[Thomas_A]

The fact that the arm is swinging, up and down, does not necessarily have to be caused by an unevenly rotating platter.

The platter, its upper surface will have incomparably smaller deviations, up and down, than 9/10 vinyl records

Granted, LPs have bigger errors both vertically and horizontally. The arm swing is however quite different on the two players for the same LP...

 

[morillon]

Granted, LPs have bigger errors both vertically and horizontally. The arm swing is however quite different on the two players for the same LP...

probably due to the clumsiness of the disk clamping mode..."the best is the enemy of the good" ("" french""")

 

[Thomas_A]

probably due to the clumsiness of the disk clamping mode..."the best is the enemy of the good" ("" french""")

Yes there is certainly something wrong with that. It is a vacuum platter and should be flat.

 

[morillon]

to know about machines like micro seiki vacuum ..
we arrive at something else on this point ... are you sure that here vacuum?

Yes there is certainly something wrong with that. It is a vacuum platter and should be flat.

 

[Thomas_A]

to know about machines like micro seiki vacuum ..
we arrive at something else on this point ... are you sure that here vacuum?

Caliburn: suspensionless turntable with O-ring drive; cogless, battery-powered DC motor; vacuum holddown. Speeds (adjustable): 33.33, 45, 78 rpm. Wow & flutter, Rumble: not specified.

 

[morillon]

Caliburn: suspensionless turntable with O-ring drive; cogless, battery-powered DC motor; vacuum holddown. Speeds (adjustable): 33.33, 45, 78 rpm. Wow & flutter, Rumble: not specified.

(maybe this slightly deaf gentleman also forgot to turn on the vacuum? then indeed it could be much worse unless in certains cases with somes solutions "vaccum, you put a heavy pressure puck to try to help etc.etc)

 

[Thomas_A]

(maybe this slightly deaf gentleman also forgot to turn on the vacuum? then indeed it could be much worse unless in certains cases with somes solutions "vaccum, you put a heavy pressure puck to try to help etc.etc)

If so, showing that mistake on a youtube video is just catastrophic. For the brand and for this gentleman.

 

[morillon]

If so, showing that mistake on a youtube video is just catastrophic. For the brand and for this gentleman.

balle clorin (I think), one day I posted a very serious video of hdg equipment..with a wf with laughter, or "vomit"... incredible...to find a best of ;-)

 

[Thomas_A]

balle clorin (I think), one day I posted a very serious video of hdg equipment..with a wf to wf with laughter, or "vomit"... incredible...to find a best of ;-)

Yes I saw that. I posted one too, totally different tonearm but svinging like crazy. At least they should show good ones - I myself have some moderate swings.

Dropbox

www.dropbox.com

 

[morillon]

(maybe the gentleman of the video reading us and can enlighten us a little?)