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Post by Paul Barker on Aug 30, 2014 11:21:25 GMT
I ran A test on the powerful version a little space only left 2 kg but at 2 kg that's Per magnet so that will be 6 kg you could distribute the weight evenly by three magnets and there wasn't really any movement at that level in the middle of its range it seems to be one Kg if you balance a 1 kg weight on it it has a lovely floating nature to it I think The middle weight is where you going to get the most beneficial high-five factor because you want plenty of scope for it to move freely.
Ok what does this mean? I could have a small one for phono stage or preamp or a class D amp.
A little progress at least.
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Post by lurcher on Aug 30, 2014 11:46:28 GMT
I am trying to work out what if any isolation this would actually give. I know it looks cool "floating on air", but its not actually foating on air (it would need a balloon or a light than air something to do that). All its doing is being held away from the base by the field. If you move the base, the "floating" part will move at the same time (well C later), so vibrations in the base will cause vibrations in the top part, and vice versa. It behaving like a spring support, with the inertia of the suspended part setting the resonant frequency. But there will be very little damping, so if the base happens to vibrate at the resonant frequency of the top part it will quickly built up oscillation.
I found in the past three LP12 springs did a similar job.
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Post by Paul Barker on Aug 30, 2014 13:35:16 GMT
Yes I can see that.
Many years ago when I had an AR Legend suspension turntable. People were harping on about by cycle inner tube support. I tried it, there was a disaster as a wobble began, coupled itself in a never ending feedback loop whic was violent.
This would have that potential.
Yet with some masses it must not enter this resonance as at least one person here is pleased. Just as nobody else said they experienced the resonance of air supported turntable.
Let us say it is not a flawless method but it may Sound good depending whether a resonance is triggered.
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Post by MartinT on Aug 30, 2014 15:27:14 GMT
It goes back to our discussion about grounding via spikes or some mechanical coupling, versus isolation, whether it be absorbent material, springs or magnetic flux. The magnets certainly cause flotation, but the component may not be well damped.
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Post by Paul Barker on Aug 30, 2014 17:27:36 GMT
I am not sure if this is what Jack of All demo'd me when we got back from vsac. I have a feeling not because I think his was pneumatic, adjustable through a schraeder valve. But it is the same principle, and not a million miles away from the magnetic method. From that experience I feel it is worth exploring, but I take on board the warning. I don't always understand the science but I am always happy to prove to myself by experiments if I can afford it. The cost of levitation is enormous for my heavier equipment. Probably pneumatics cost less for same effect. I am still not comfortable with the side friction, thought there may be mileage in combining magnetics with hydraulics, to both damp and smooth the side friction in the piston. the oem equipment is manufactured so that the gap is visible but this is needless. A sales ploy. A sealed shaft allowing for hydraulic damping would suffer no ill effects related to it being blind. Whether the hydraulic damping is better or worse is another matter. |
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Post by lurcher on Aug 30, 2014 18:37:41 GMT
Why not use the standard turntable method. A spring with various density of foam in the middle to add damping. You could use a cut down bike front fork string to the heaver items.
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Post by Paul Barker on Aug 30, 2014 18:47:08 GMT
I must say the Michelle gyrodec on marble plinth had qualities which beat my Garrard 301 in terms of top end and really everywhere except bottom end. The AR legend was low fi in comparrison.
In many ways I wish I had never sold the marble gyrodec.
But I do love my Garrard 301. Quite happy with it as it is. No need for levitation of it.
there are pros and cons of everything.
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Post by John on Aug 30, 2014 20:46:12 GMT
With the Salvation using magnetic isolation takes things a bit further so a worth while effort
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Post by jandl100 on Aug 31, 2014 8:07:20 GMT
I agree with lurcher - it isn't really floating on air. It's sitting on a compliant support.
Levitation seems to be to be a misnomer - opposing magnetic fields are real even if you can't see them.
Push two opposing magnets together and you can feel a firm squishiness that increases as you push them closer together. Very much like a spring!
I think this resilience will act as a damping mechanism, but the resonant frequency is going to depend on the mass involved and the strength of the magnets, i.e. fairly unpredictable given the nature of the product I have.
Or so it seems to my relatively untutored brain. 
It certainly seems beneficial with my heavy (27Kg) NAD ss amp. |
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Post by MikeMusic on Aug 31, 2014 10:02:43 GMT
I'm beginning to get the beginning of the idea of what we need to do. Keep on talking and I'll catch up |
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Post by MartinT on Sept 24, 2014 17:30:20 GMT
I'm looking into this some more, still trying to find the ultimate isolation for my turntable.
Has anyone tried any of this range, I can't really work out how they are constructed or get any more information on them. Thinking maybe they're worth a try. |
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Post by John on Sept 24, 2014 18:28:00 GMT
Try having a word with Vic at Trans Fi he might be able to make some for you
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Post by Paul Barker on Sept 24, 2014 18:39:36 GMT
I'm looking into........... this range,............. Thinking maybe they're worth a try. £66 for four compared to $200 for the design originally quoted in this thread: Excellent price. Look well made. |
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Post by MartinT on Sept 24, 2014 18:45:27 GMT
Chinese - could be great or poor. No way of telling, but they do look good. I'm going to buy a set to try.
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Post by MikeMusic on Sept 25, 2014 8:59:25 GMT
Would any strong magnet work ?
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Post by MartinT on Sept 25, 2014 12:15:01 GMT
How? You have to have a housing of some sort to force pistonic movement, otherwise the opposing magnets will just, err, repel each other and throw the component off.
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Post by MikeMusic on Sept 25, 2014 12:21:43 GMT
I'm the ideas man ! |
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