mag-lev-turntable

[micky]

So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Brooklyn-Baltimore Guy

 

[pfjw@aol.com]

On Thursday, November 10, 2016 at 2:16:10 PM UTC-5, micky wrote:

So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Brooklyn-Baltimore Guy

Probably For Real. Too much/many "other" sources and information out there.

Interesting idea. One does wonder how the centering and leveling functions work. I can figure out how they handle rotation. A half-price for pre-purchase is not a half-bad deal given it comes with an arm and cartridge.

Peter Wieck
Melrose Park, PA

 

I see it as a novelty. It may well work and may be worth more than the sum of its parts but is it worth it ?

And forget DC coupling in the amp it drives. Levitated that high the magnetic fields needed to drive it will be substantial and be picked up by the cartridge. If it is three phase drive that works out to about 1.7 Hz, which is quite low. However if you buy such an expensive turntable you are likely to have an expensive phono preamp which may be DC coupled. So then you have to use some sort of filter to get that noise out.

I don't generally go for these pay before they are even built schemes. There is a reason that some company somewhere is not already doing this. What is half price ? Ten grand ?

That is why I am not in the one for Red Pataya, which is like an Arduino but supposedly more versatile, or something.

And I see no reason in having a turntable that is higher fidelity than the lathe on which the master record was cut.

I am not necessarily saying the people are crooks, but it is someone's pet project and they do expect to make money. There is another one out there, a vertical turntable. There are people putting money into that as well and it is not a really good idea. It is one hell of a novelty, as this is and if you got the money honey, go for it. Impress your friends and enemies as well.

 

[Jon Elson]

micky wrote:

So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Brooklyn-Baltimore Guy

Oh, boy! Did you see how HIGH they levitate the platter? Geez, I have
strong doubts it can be stable at that height. Also, the thing must have an
insanely strong external magnetic field.

Now, the only way I know one-sided levitation at low speeds can work is with
something that TOTALLY excludes flux lines, ie. a superconductor.

So, the only way this thing could work is with a spinning Halbach array
under the platter (which would play HELL with a magnetic phono cartridge) or
massive high-field magnets underneath and a room temperature superconductor
in the platter. Hmmm, can't buy that yet...

I know of no way to repel something ordinary with a steady magnetic field,
although with strong tapered AC fields, it is possible to repel a conductor.
I've seen this done with a big 3-phase AC motor stator and an aluminum
platter. But, the motor draws insane current and the platter gets hot fast.

Brooklyn? As in Brooklyn bridge? Yup, sounds pretty appropriate, I'm very
skeptical of this one. I think it probably CAN be done, but not as a
practical device, capable of operating right next to a megnetic phono
cartridge.

Jon

 

[Dave Platt]

In article <35a60b97-b7f3-402b-83da-bfce7f5407a8@googlegroups.com>,
pfjw@aol.com <pfjw@aol.com> wrote:

On Thursday, November 10, 2016 at 2:16:10 PM UTC-5, micky wrote:
So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Brooklyn-Baltimore Guy

Probably For Real. Too much/many "other" sources and information out
there.

I didn't see that they cited the numbers of the patent(s) that they say
they have.

Interesting idea. One does wonder how the centering and leveling functions work. I can figure out how they handle rotation. A half-price for
pre-purchase is not a half-bad deal given it comes with an arm and cartridge.

The other trick which puzzles me, is how they keep the magnetic
levitation/centering/rotation field from being picked up by the
cartridge, or keeping the magnitude of the pick-up down below the
noise floor of the phono preamplifier.

Years ago, some of the Grado cartridges had a bad reputation for hum
when used with certain turntables - the stray fields from the AC
motors were picked up by the coils in the cartridge.

 

[MJC]

In article <hnh92cl1gv8dgmh2rn023fs4ltjrtivh8c@4ax.com>, NONONOmisc07
@bigfoot.com says...

So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Brooklyn-Baltimore Guy

Lovely ide, but I'd want to know more... Presumably the huge floating
height in the "photo" is merely to make it obvious, rather than being
enough to de-couple a major earthquake?

And how is the speed controlled?

Mike

 

[John Robertson]

On 11/10/2016 3:24 PM, jurb6006@gmail.com wrote:

I see it as a novelty. It may well work and may be worth more than the sum of its parts but is it worth it ?

And forget DC coupling in the amp it drives. Levitated that high the magnetic fields needed to drive it will be substantial and be picked up by the cartridge. If it is three phase drive that works out to about 1.7 Hz, which is quite low. However if you buy such an expensive turntable you are likely to have an expensive phono preamp which may be DC coupled. So then you have to use some sort of filter to get that noise out.

I don't generally go for these pay before they are even built schemes. There is a reason that some company somewhere is not already doing this. What is half price ? Ten grand ?

That is why I am not in the one for Red Pataya, which is like an Arduino but supposedly more versatile, or something.

And I see no reason in having a turntable that is higher fidelity than the lathe on which the master record was cut.

I am not necessarily saying the people are crooks, but it is someone's pet project and they do expect to make money. There is another one out there, a vertical turntable. There are people putting money into that as well and it is not a really good idea. It is one hell of a novelty, as this is and if you got the money honey, go for it. Impress your friends and enemies as well.

Vertical record players have been around since at least the 1940s...
Seeburg jukeboxes all used vertical storage and play of both 78s (1940s)
and 45s right to the end - early 1990s.

Sony used a vertical player for their CDs.

John :-#)#

--
(Please post followups or tech inquiries to the USENET newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
(604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."

 

[isw]

In article <hnh92cl1gv8dgmh2rn023fs4ltjrtivh8c@4ax.com>,
micky <NONONOmisc07@bigfoot.com> wrote:

So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

The best you can do with vinyl is pretty poor; why bother?

Plus, rumble has not been a problem on "ordinary" turntables (well,
decent-quality ones) for quite a while.

Isaac

 

[pfjw@aol.com]

On Thursday, November 10, 2016 at 3:29:19 PM UTC-5, Jon Elson wrote:

Oh, boy! Did you see how HIGH they levitate the platter? Geez, I have
strong doubts it can be stable at that height. Also, the thing must have an
insanely strong external magnetic field.

Now, the only way I know one-sided levitation at low speeds can work is with
something that TOTALLY excludes flux lines, ie. a superconductor.

https://en.wikipedia.org/wiki/Neodymium_magnet

I have experienced these magnets directly - when we were in China, the novelty shops sold a device with what amounted to a metal puck, about the size of a hockey puck but half the thickness that could be suspended above a platform if "heads" or was very nearly impossible to remove from the platform except by sliding if "tails". Variations included a shaft that could be spun in suspension over a bed attached to the platform and another that could be twirled.

When we tried to bring it back to the US in our checked baggage, we were called to the front of the plane and informed that these things were powerful enough to interfere with aircraft navigation systems - and that we would have to either get off the aircraft and mail it, or give it up. We gave it up.

In any case, I would have no difficulty at all believing Neodymium magnets within the platter with a rotating field developed in the plinth reaching that distance. And, it would have the additional effect of 'centering' the platter as well. The platter *will* be quite heavy.

Now, one more beneficial effect of this system: The field will be, effectively, two nested donuts, and they could be rather small relative to the 12" platter given the power of the static field (in the platter) - perhaps as little/small as 6". At that size, the platter would be a shield for the cartridge both magnetically and in rF. Note that the cartridge is always *ABOVE* the field with the platter between it and that field.

Not that I am going to line up to purchase that TT. I am hooked on linear tracking arms - and unless/until that happens, it is only a neat trick, no more.

Peter Wieck
Melrose Park, PA

 

[Jim]

In article <if3ffd-95m.ln1@coop.radagast.org>, Dave Platt
<dplatt@coop.radagast.org> wrote:

The other trick which puzzles me, is how they keep the magnetic
levitation/centering/rotation field from being picked up by the
cartridge, or keeping the magnitude of the pick-up down below the
noise floor of the phono preamplifier.

Perhaps they use a ceramic cartridge. The sound would suffer, but it
would still look pretty cool.

--
Jim

 

[MJC]

In article <da39e406-8f82-48f4-88a3-c9c74f821e7a@googlegroups.com>,
jurb6006@gmail.com says...

... There is another one out there, a vertical turntable. There are

people putting money into that as well and it is not a really good idea.
It is one hell of a novelty, as this is and if you got the money honey,
go for it. Impress your friends and enemies as well.

I'm sure a vertical turntable was marketed decades ago. I don't remember
the supposed advantage, though...

Mike.

 

[pfjw@aol.com]

On Friday, November 11, 2016 at 10:15:18 AM UTC-5, Mark Storkamp wrote:

> let's see, how many things can go wrong here.

https://www.dropbox.com/s/huq5ehstsoe0cbo/maglev%20wild%20speculation.docx?dl=0

This is my wildly speculative speculation on how this system could work and be effective. Some points:

a) Neodymium magnets are wildly powerful. And can be shaped more efficiently than many other materials.
b) By offsetting the suspension rings as shown, the forces centering and keeping the platter level would be very strong - certainly stronger than most suspension springs for that matter.
c) And there would be negligible elastic forces - that is, no wobble or bounce. That window fan would not have a chance. Damping, similarly.
d) The wow and flutter issue, though very real, would be pretty much eliminated by the mass of the platter (considerable) coupled with the very negligible mass of the drive motor.
e) As the platter is essentially frictionless, it would not take much to keep it running once started. I would anticipate a few seconds of start-up, but after that, gyroscopic effects would contribute to leveling and to speed control. The couple of grams on the stylus, again, would not have a chance..
f) The soft shut-down is already addressed. There is an on-board soft shut-down capacity that will raise the posts and lift the stylus.
g) As to magnetic fields - consider that both the suspension field and the drive fields are static relative to each other. Meaning that there will be very little generated by way of stray fields, and that the platter, if properly designed, will be enough to shield the cartridge. Considering what goes on inside my HK/Rabco without ill effect, or my Revox B295, this would be low on my worry-scale.

Again, this is a neat trick, not something I intend to purchase. But a neat trick that appears to be both possible and reasonable to execute.

Peter Wieck
Melrose Park, PA

 

[Chuck]

On Fri, 11 Nov 2016 12:28:55 -0000, MJC <gravity@mjcoon.plus.com>
wrote:

In article <da39e406-8f82-48f4-88a3-c9c74f821e7a@googlegroups.com>,
jurb6006@gmail.com says...

... There is another one out there, a vertical turntable. There are
people putting money into that as well and it is not a really good idea.
It is one hell of a novelty, as this is and if you got the money honey,
go for it. Impress your friends and enemies as well.

I'm sure a vertical turntable was marketed decades ago. I don't remember
the supposed advantage, though...

Mike.

One advantage was that they could be built into boomboxes and an arm
could be mounted on the front and the back. (No need to flip the
record) I remember when they first Sharp samples showed up at Best
Buy. They were monstrosities that I thought wouldn't sell and I was
right.

---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

 

[Mark Storkamp]

In article <hnh92cl1gv8dgmh2rn023fs4ltjrtivh8c@4ax.com>,
micky <NONONOmisc07@bigfoot.com> wrote:

So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Brooklyn-Baltimore Guy

let's see, how many things can go wrong here.

1) the stylus has weight required for proper tracking. It will want to
tilt the platter, and the torque will vary from edge to center.

2) there's friction at the stylus, making the platter want to rotate
around the point of contact.

3) the base is still coupled to the platter through the magnetic field.
Vibrations will still be coupled to the platter.

4) better have a UPS. You don't want that platter crashing down when the
power goes out.

5) that large of a magnetic field wont interfere with the cartridge?

6) a rotating magnetic field driving the platter will introduce just as
much wow and flutter as is introduced by the motor of a direct drive
turntable.

7) an open window or a fan could easily blow that platter around
creating even more distortion.

And that's without putting much thought into it. But it seems they've
already exceeded their goal and have more than $400,000.

 

On Thursday, November 10, 2016 at 2:16:10 PM UTC-5, micky wrote:

So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Brooklyn-Baltimore Guy

Seems like a solution in search of a problem. In a world filled with people who now listen to MP3s or other forms of compression I wonder how many folks in the world would want this even if it does all it promises.

And, I'm willing to bet that in a double blind test with even quality tables at the lower end of the spectrum, this toy's superiority would not be discernible, even if "audiophiles" do avoid double blind tests.

 

On Friday, November 11, 2016 at 5:58:43 PM UTC-5, ohg...@gmail.com wrote:

On Thursday, November 10, 2016 at 2:16:10 PM UTC-5, micky wrote:
So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Brooklyn-Baltimore Guy



Seems like a solution in search of a problem. In a world filled with people who now listen to MP3s or other forms of compression I wonder how many folks in the world would want this even if it does all it promises.

And, I'm willing to bet that in a double blind test with even quality tables at the lower end of the spectrum, this toy's superiority would not be discernible, even if "audiophiles" do avoid double blind tests.

Just watched this video:

https://www.youtube.com/watch?v=Ky0D00iyHAA

There is a LOT of platter movement beyond the rotating moments going on here. Check 0:42

 

[whit3rd]

On Thursday, November 10, 2016 at 12:29:19 PM UTC-8, Jon Elson wrote:

micky wrote:

So is this for real, or a kickstarter designed to cheat me out of my
hard-earned money?

http://www.avsforum.com/mag-lev-turntable/

Oh, boy! Did you see how HIGH they levitate the platter? Geez, I have
strong doubts it can be stable at that height. Also, the thing must have an
insanely strong external magnetic field.

Rogers Ritter published on a low-rumble magnetic suspension audio turntable back
in the seventies; he was using magnetic attraction, and some active feedback,
and was more interested in physics (gravity research) than audio. If these
folk have a patent, that's not what they're doing.

What puzzles me, is how there's enough reliable torque on the rotor.

Now, the only way I know one-sided levitation at low speeds can work is with
something that TOTALLY excludes flux lines, ie. a superconductor.

To levitate a light platter at low speeds, you could get use fixed
magnets and a 2-d conductor (pyrolitic graphite, doped, is light
and has conductivity better than copper). Levitation distances
of a few millimeters would work, after spin-up. No torque, though, if
that's the only trick used.

So, the only way this thing could work is with a spinning Halbach array .. or
massive high-field magnets underneath and a room temperature superconductor

Third possibility fixed magnets, spinning conductor. And smaller
gap than the pic shows.

Lots of info on the magnet-bearing subject:

<https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19920018478.pdf>

 

[Mark Storkamp]

In article <b3dbfbea-5345-4abb-84d2-e42d3be3831d@googlegroups.com>,
"pfjw@aol.com" <pfjw@aol.com> wrote:

On Friday, November 11, 2016 at 10:15:18 AM UTC-5, Mark Storkamp wrote:

let's see, how many things can go wrong here.

https://www.dropbox.com/s/huq5ehstsoe0cbo/maglev%20wild%20speculation.docx?dl=
0

This is my wildly speculative speculation on how this system could work and
be effective. Some points:

a) Neodymium magnets are wildly powerful. And can be shaped more efficiently
than many other materials.
b) By offsetting the suspension rings as shown, the forces centering and
keeping the platter level would be very strong - certainly stronger than most
suspension springs for that matter.
c) And there would be negligible elastic forces - that is, no wobble or
bounce. That window fan would not have a chance. Damping, similarly.
d) The wow and flutter issue, though very real, would be pretty much
eliminated by the mass of the platter (considerable) coupled with the very
negligible mass of the drive motor.
e) As the platter is essentially frictionless, it would not take much to keep
it running once started. I would anticipate a few seconds of start-up, but
after that, gyroscopic effects would contribute to leveling and to speed
control. The couple of grams on the stylus, again, would not have a chance.
f) The soft shut-down is already addressed. There is an on-board soft
shut-down capacity that will raise the posts and lift the stylus.
g) As to magnetic fields - consider that both the suspension field and the
drive fields are static relative to each other. Meaning that there will be
very little generated by way of stray fields, and that the platter, if
properly designed, will be enough to shield the cartridge. Considering what
goes on inside my HK/Rabco without ill effect, or my Revox B295, this would
be low on my worry-scale.

Again, this is a neat trick, not something I intend to purchase. But a neat
trick that appears to be both possible and reasonable to execute.

Peter Wieck
Melrose Park, PA

Still seems like it would be a lot easier to use direct drive and air
bearings. But since it's already been done, there wouldn't be as much
money in it.

 

[MJC]

In article <91019702-84a9-4ff2-9e60-9673226223e2@googlegroups.com>,
ohger1s@gmail.com says...

And, I'm willing to bet that in a double blind test with even quality

tables at the lower end of the spectrum, this toy's superiority would
not be discernible, even if "audiophiles" do avoid double blind tests.

Just been watching on TV a single-blind test of three turntables costing
approx order of magnitude amounts apart. The two listeners claimed to
put then in order of merit per cost!

Mike.

 

[Phil Allison]

Jon Elson wrote:

http://www.avsforum.com/mag-lev-turntable/



Oh, boy! Did you see how HIGH they levitate the platter? Geez, I have
strong doubts it can be stable at that height. Also, the thing must have an
insanely strong external magnetic field.

Now, the only way I know one-sided levitation at low speeds can work is with
something that TOTALLY excludes flux lines, ie. a superconductor.

So, the only way this thing could work is with a spinning Halbach array
under the platter (which would play HELL with a magnetic phono cartridge) or
massive high-field magnets underneath and a room temperature superconductor
in the platter. Hmmm, can't buy that yet...

I know of no way to repel something ordinary with a steady magnetic field,
although with strong tapered AC fields, it is possible to repel a conductor.
I've seen this done with a big 3-phase AC motor stator and an aluminum
platter. But, the motor draws insane current and the platter gets hot fast.

** OK, my two cents worth:

The specs say the power consumption is only 12 watts - so static lift must be achieved with permanent magnets.

There are no claims made for W&F so it must be poor, mostly due to imperfect centring of the LP. There are no claims that it is a genuine, hi-fi turntable.

The platter wobbles and bounces for ages when disturbed, hence the use of support pegs when not running.

The lack of important details and the OTT marketing videos makes it all smell very badly of SCAM.



..... Phil