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#1
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Interesting turntable
https://maglevaudio.com If the link doesn't work search maglev turntable May eliminate rumble, but eccentricity must be a challenge. M |
#2
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Interesting turntable
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#3
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Interesting turntable
On Sun, 2 Jul 2017 10:55:12 +1200, geoff
wrote: On 2/07/2017 6:01 AM, wrote: https://maglevaudio.com If the link doesn't work search maglev turntable May eliminate rumble, but eccentricity must be a challenge. M Yeah but you'd need a piezo crystal cartridge. They come with an Ortofon magnetic. geoff |
#4
Posted to rec.audio.pro
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Interesting turntable
On 2/07/2017 4:14 p.m., Chuck H. wrote:
On Sun, 2 Jul 2017 10:55:12 +1200, geoff wrote: On 2/07/2017 6:01 AM, wrote: https://maglevaudio.com If the link doesn't work search maglev turntable May eliminate rumble, but eccentricity must be a challenge. M Yeah but you'd need a piezo crystal cartridge. They come with an Ortofon magnetic. geoff So it seems. And the the levitation and rotation is achieve how ? Not convinced it's for real. geoff |
#5
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Interesting turntable
On 7/1/2017 11:14 PM, Chuck H. wrote:
On Sun, 2 Jul 2017 10:55:12 +1200, geoff wrote: On 2/07/2017 6:01 AM, wrote: https://maglevaudio.com If the link doesn't work search maglev turntable May eliminate rumble, but eccentricity must be a challenge. M Yeah but you'd need a piezo crystal cartridge. They come with an Ortofon magnetic. geoff How are the applying the drive force to the turntable? |
#6
Posted to rec.audio.pro
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Interesting turntable
geoff wrote:
--------------------- And the the levitation and rotation is achieve how ? Not convinced it's for real. ** Many things about it scream scam - but .... https://www.kickstarter.com/projects.../posts/1898322 Only 12W consumption so it must use permanent magnets. ..... Phil ...... Phil |
#7
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Interesting turntable
On 2/07/2017 3:11 PM, geoff wrote:
On 2/07/2017 4:14 p.m., Chuck H. wrote: On Sun, 2 Jul 2017 10:55:12 +1200, geoff wrote: On 2/07/2017 6:01 AM, wrote: https://maglevaudio.com If the link doesn't work search maglev turntable May eliminate rumble, but eccentricity must be a challenge. Yeah but you'd need a piezo crystal cartridge. They come with an Ortofon magnetic. So it seems. And the the levitation and rotation is achieve how ? Not convinced it's for real. Who cares. Even if it is you can be certain it's just an expensive gimmick for people with more money than sense. (So I guess the vinyl nostalgia market is a perfect target. :-) The low end Ortofon OM5E as used in most budget turntables gives you an idea of the performance to expect for a start. Trevor. |
#8
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Interesting turntable
On Sun, 2 Jul 2017 17:04:01 +1000, Trevor wrote:
On 2/07/2017 3:11 PM, geoff wrote: On 2/07/2017 4:14 p.m., Chuck H. wrote: On Sun, 2 Jul 2017 10:55:12 +1200, geoff wrote: On 2/07/2017 6:01 AM, wrote: https://maglevaudio.com If the link doesn't work search maglev turntable May eliminate rumble, but eccentricity must be a challenge. Yeah but you'd need a piezo crystal cartridge. They come with an Ortofon magnetic. So it seems. And the the levitation and rotation is achieve how ? Not convinced it's for real. Who cares. Even if it is you can be certain it's just an expensive gimmick for people with more money than sense. (So I guess the vinyl nostalgia market is a perfect target. :-) The low end Ortofon OM5E as used in most budget turntables gives you an idea of the performance to expect for a start. The whole exercise is simply one turd-polishing. Once you have moved beyond a Dansette, you've surpassed all the quality possibilities of vinyl. d --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#9
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Interesting turntable
On 7/2/2017 1:11 AM, geoff wrote:
And the the levitation and rotation is achieve how ? Permanent magnets. It runs. It plays records. I saw one at CES this year. I think it's more for amazing and amusing your friends than for being a superior way to play records, though I expect that the isolation from vibration is excellent. Just the thing for playing your old Bob Dylan or Aerosmith LPs during an earthquake. -- For a good time, call http://mikeriversaudio.wordpress.com |
#10
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Interesting turntable
On 2/07/2017 9:10 PM, Mike Rivers wrote:
On 7/2/2017 1:11 AM, geoff wrote: And the the levitation and rotation is achieve how ? Permanent magnets. It runs. It plays records. I saw one at CES this year. I think it's more for amazing and amusing your friends than for being a superior way to play records, I don't think there is any doubt about that. though I expect that the isolation from vibration is excellent. I wouldn't be sure about that. The magnetic coupling must be pretty good for it to work at all, which means most vibration should also be pretty well coupled. Trevor. |
#11
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Interesting turntable
Trevor wrote:
----------------- Mike Rivers wrote: geoff wrote: And the the levitation and rotation is achieve how ? Permanent magnets. It runs. It plays records. I saw one at CES this year. I think it's more for amazing and amusing your friends than for being a superior way to play records, I don't think there is any doubt about that. though I expect that the isolation from vibration is excellent. I wouldn't be sure about that. The magnetic coupling must be pretty good for it to work at all, which means most vibration should also be pretty well coupled. ** In a video of the unit, the platter is seen bouncing about for many seconds when displaced - much like a Lin Sondek's platter does. The Sondek has soft coil springs supporting a heavy alloy platter and its sub frame. As a result, it has really excellent isolation from floor vibrations. So my bet is Mike is right. ..... Phil |
#12
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Interesting turntable
On 3/07/2017 12:58 AM, Phil Allison wrote:
** In a video of the unit, the platter is seen bouncing about for many seconds when displaced - much like a Lin Sondek's platter does. The Sondek has soft coil springs supporting a heavy alloy platter and its sub frame. As a result, it has really excellent isolation from floor vibrations. So my bet is Mike is right. .... Phil Would be better if the tone arm, rigidly-coupled to the platter, was equally isolated. Cos otherwise any vibration etc with get to the cartridge by that route. And what about the drive magnetics ? The opportunity to 'pre-order' says it all for me. geoff |
#13
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Interesting turntable
Digital motor my guess.
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#14
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Interesting turntable
geoff wrote:
-------------------- Phil Allison wrote: ** In a video of the unit, the platter is seen bouncing about for many seconds when displaced - much like a Lin Sondek's platter does. The Sondek has soft coil springs supporting a heavy alloy platter and its sub frame. As a result, it has really excellent isolation from floor vibrations. So my bet is Mike is right. Would be better if the tone arm, rigidly-coupled to the platter, ** Err - you mean base. was equally isolated. Cos otherwise any vibration etc with get to the cartridge by that route. ** In practice, almost none does and then creates no output. The famous Sondek has the same arrangement. https://en.wikipedia.org/wiki/Linn_Sondek_LP12 And what about the drive magnetics ? ** That is still a mystery. Electromagnetics could be used, it needs little power. The opportunity to 'pre-order' says it all for me. ** Production is still not under way. AFAIK it is intended that all sales be done on-line with the makers in Slovenia. ..... Phil |
#15
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Interesting turntable
On 3/07/2017 1:29 PM, Phil Allison wrote:
geoff wrote: -------------------- Phil Allison wrote: ** In a video of the unit, the platter is seen bouncing about for many seconds when displaced - much like a Lin Sondek's platter does. The Sondek has soft coil springs supporting a heavy alloy platter and its sub frame. As a result, it has really excellent isolation from floor vibrations. So my bet is Mike is right. Would be better if the tone arm, rigidly-coupled to the platter, ** Err - you mean base. Base and platter. If the base/tonearm is vibrating and the platter isn't, then output results from cartridge. If tonearm and platter on the same structure then any excitation is to both and is therefore in unison (apart from from the disc !), then likely less output from the cartridge. My olde Garrard 301/SME had the whole base on a board that was itself isolated from the casing and whatever it stood on - in my case a heavy wooden table with legs standing on concrete piles into the ground below, not touching the floor ! (Extreme and probably pointless, yes, but I was building the house and there was little actual effort involved./..) was equally isolated. Cos otherwise any vibration etc with get to the cartridge by that route. ** In practice, almost none does and then creates no output. The famous Sondek has the same arrangement. I think you'll find the tone-arm and platter are on the same suspended sub-chassis. Mine friend's was. https://en.wikipedia.org/wiki/Linn_Sondek_LP12 And what about the drive magnetics ? ** That is still a mystery. Electromagnetics could be used, it needs little power. Electromagnetics and magnetic cartridge ... geoff |
#16
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Interesting turntable
Geoff wrote:
--------------- ** In practice, almost none does and then creates no output. The famous Sondek has the same arrangement. I think you'll find the tone-arm and platter are on the same suspended sub-chassis. Mine friend's was. ** On reflection, I think you are right. I never owned a Sondek but used a belt drive TT and uni-pivot arm mounted on inch thick Perspex. The Perspex slab was suspended on three be-hive springs and wobbled like jelly if bumped. The floor isolation was amazing. ..... Phil |
#17
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Interesting turntable
On 3/07/2017 4:50 PM, Phil Allison wrote:
Geoff wrote: --------------- ** In practice, almost none does and then creates no output. The famous Sondek has the same arrangement. I think you'll find the tone-arm and platter are on the same suspended sub-chassis. Mine friend's was. ** On reflection, I think you are right. I never owned a Sondek but used a belt drive TT and uni-pivot arm mounted on inch thick Perspex. The Perspex slab was suspended on three be-hive springs and wobbled like jelly if bumped. The floor isolation was amazing. .... Phil Sounds like a Mitchell Focus I once had,. But then again I think that was glass. geoff |
#18
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Interesting turntable
Phil Allison wrote:
geoff wrote: --------------------- And the the levitation and rotation is achieve how ? Not convinced it's for real. ** Many things about it scream scam - but .... https://www.kickstarter.com/projects.../posts/1898322 Only 12W consumption so it must use permanent magnets. Yes. It uses permanent magnets whose field falls off with the 4th power of the distance so the resistance increases dramatically with deflection. Which is good, at least in terms of the spring side of the mass-spring system. The problem with this implementation is that it doesn't have enough mass, so once you set it moving it bounces back and forth pretty severely at the system's resonant frequency. Doesn't anyone build sand tables anymore? --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#19
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Interesting turntable
On 03/07/2017 13:54, Scott Dorsey wrote:
Doesn't anyone build sand tables anymore? Werll, guv'nor. It's like this. You just can't get decent sand nowadays. Sucks teeth Costs an arm and a leg, it does... Walks off, shaking head gently -- Tciao for Now! John. |
#20
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Interesting turntable
Scott Dorsey wrote:
Phil Allison wrote: geoff wrote: --------------------- And the the levitation and rotation is achieve how ? Not convinced it's for real. ** Many things about it scream scam - but .... https://www.kickstarter.com/projects.../posts/1898322 Only 12W consumption so it must use permanent magnets. Yes. It uses permanent magnets whose field falls off with the 4th power of the distance so the resistance increases dramatically with deflection. Which is good, at least in terms of the spring side of the mass-spring system. The problem with this implementation is that it doesn't have enough mass, so once you set it moving it bounces back and forth pretty severely at the system's resonant frequency. Doesn't anyone build sand tables anymore? --scott Not if they can help it. -- Les Cargill |
#21
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Interesting turntable
Scott Dorsey wrote:
------------------------ ** Many things about it scream scam - but .... https://www.kickstarter.com/projects.../posts/1898322 Only 12W consumption so it must use permanent magnets. Yes. It uses permanent magnets whose field falls off with the 4th power of the distance so the resistance increases dramatically with deflection. Which is good, at least in terms of the spring side of the mass-spring system. The problem with this implementation is that it doesn't have enough mass, so once you set it moving it bounces back and forth pretty severely at the system's resonant frequency. ** Adding mas to the platter would only make the bouncing worse. The problem is lack of damping. How the heck do you damp something that floats ? ...... Phil |
#22
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Interesting turntable
On 4/07/2017 1:34 p.m., Phil Allison wrote:
How the heck do you damp something that floats ? Enough of this toilet humour ! geoff |
#23
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Interesting turntable
On Sunday, July 2, 2017 at 9:29:29 PM UTC-4, Phil Allison wrote:
geoff wrote: -------------------- Phil Allison wrote: ** In a video of the unit, the platter is seen bouncing about for many seconds when displaced - much like a Lin Sondek's platter does. The Sondek has soft coil springs supporting a heavy alloy platter and its sub frame. As a result, it has really excellent isolation from floor vibrations. So my bet is Mike is right. Would be better if the tone arm, rigidly-coupled to the platter, ** Err - you mean base. was equally isolated. Cos otherwise any vibration etc with get to the cartridge by that route. ** In practice, almost none does and then creates no output. The famous Sondek has the same arrangement. https://en.wikipedia.org/wiki/Linn_Sondek_LP12 And what about the drive magnetics ? ** That is still a mystery. Electromagnetics could be used, it needs little power. The opportunity to 'pre-order' says it all for me. ** Production is still not under way. AFAIK it is intended that all sales be done on-line with the makers in Slovenia. .... Phil I say it's more complex than just magnets, otherwise someone would have produced one years ago. Besides, it'd be too unstable with just magnets. Too much ripple in the DC would be sent to the platter, 120Hz. vibrations! Jack |
#24
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Interesting turntable
On Mon, 3 Jul 2017 18:34:15 -0700 (PDT), Phil Allison
wrote: Scott Dorsey wrote: ------------------------ ** Many things about it scream scam - but .... https://www.kickstarter.com/projects.../posts/1898322 Only 12W consumption so it must use permanent magnets. Yes. It uses permanent magnets whose field falls off with the 4th power of the distance so the resistance increases dramatically with deflection. Which is good, at least in terms of the spring side of the mass-spring system. The problem with this implementation is that it doesn't have enough mass, so once you set it moving it bounces back and forth pretty severely at the system's resonant frequency. ** Adding mas to the platter would only make the bouncing worse. The problem is lack of damping. How the heck do you damp something that floats ? There is plenty of magnetic field there. All you need is some copper or aluminium to generate eddy currents. d --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
#25
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Interesting turntable
Phil Allison wrote:
** Adding mas to the platter would only make the bouncing worse. The problem is lack of damping. Adding mass would make it bounce at a lower and lower frequency, so you could get it down to very long periods. But agreed, the lack of damping is the worst problem. The more I think about it, though, the more I think that the nonlinearity of the repulsion means you can't easily model it simply as a damped spring system, since it's nearly "bouncing off the stops" at the extremes with a low-resistance band in the middle. I think this is actually going to be worse than spring coupling if one were to do the math. How the heck do you damp something that floats ? Put it underwater! Or in motor oil! Or in a sulfur hexafluoride atmosphere! --scott Or sand... -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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