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Author Topic: The Turntable Thread  (Read 45102 times)

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shaizada

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Re: The Turntable Thread
« Reply #300 on: August 21, 2015, 08:21:00 PM »
The multiple motors have advantages and disadvantages.  They are somewhat more expensive to implement properly, but the prevailing notion is that they offer more torque, better speed stability, less cogging effects (with use of high quality power supplies/regulators) etc.  If not managed, some disadvantages are higher costs and more noise.  Intelligent engineering can maximize advantages and minimize negatives.
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shotgunshane

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Re: The Turntable Thread
« Reply #301 on: September 02, 2015, 05:27:31 PM »
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Anaxilus

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Re: The Turntable Thread
« Reply #302 on: September 02, 2015, 05:32:30 PM »
Non-cogging direct drive. That'll shut a lot of people up. Or not... popcorn popcorn popcorn
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Marvey

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Re: The Turntable Thread
« Reply #303 on: September 02, 2015, 05:36:20 PM »
$5000
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OJneg

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Re: The Turntable Thread
« Reply #304 on: September 02, 2015, 05:43:43 PM »
Quote from: Marvey on September 02, 2015, 05:36:20 PM
$5000

If an true SL1200 were to be built today it would cost more than a VPI  p:/
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Marvey

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Re: The Turntable Thread
« Reply #305 on: September 03, 2015, 03:13:15 AM »
Craig has a TOTL Sony direct drive table - the model right before they released their linear tracking tables. Similar to SL1200, but with fancy high-tech arm that auto adjusts everything (typical Sony of yesteryear) and heavier platter and plinth. It was $3000 in the 80s. That would be $10K today.

VPI's most expensive table is $30K and direct drive. Uses a $4k (supposedly their cost) special motor from an outfit in Ventura, CA.


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Anaxilus

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Re: The Turntable Thread
« Reply #306 on: September 03, 2015, 03:36:24 AM »
So why aren't linear trackers more prevalent? You'd think with the tech available today and potential convenience and ease of use they'd be brilliant. Vendors like the margins on pivots and audiophiles are fearful of messing up their records? Or is it the constant coupling of the tonearm to a gear or motor?
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"If you do not change direction, you may end up where you are heading." - Lao Tzu

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Marvey

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Re: The Turntable Thread
« Reply #307 on: September 03, 2015, 03:39:41 AM »
Probably cost and added complexity. Also the longer arms won't have as much tracking error (although there seems to be a huge disproportionate price increase to length.) If you take a look at the VPI JMV unipivot arms, you realize the simplicity of its construction. It's essentially a metal stick resting on top of a needle point pivot. Hint to Schiit...
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Anaxilus

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Re: The Turntable Thread
« Reply #308 on: September 03, 2015, 03:43:40 AM »
So a tiny spindle bearing. Is it possible to have a single arm long enough to compensate for IGD and forego the various alignment 'standards'?
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"If you do not change direction, you may end up where you are heading." - Lao Tzu

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Marvey

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Re: The Turntable Thread
« Reply #309 on: September 03, 2015, 04:16:56 AM »
I suspect inner groove "distortion" is more a matter of bad cart alignment, records ruined by bad cart alignment, incapable styli, or the inner grooves moving at less linear velocity (and information being more tightly packed) than the outer grooves.

Here's a good article that our resident Hydrogen Audio friend OJ would appreciate: http://www.stereophile.com/reference/arc_angles_optimizing_tonearm_geometry/index.html
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