I wonder how they keep the magnetic field that levitates the platter from interfering with the magnetic field in the cartridge?
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Funny,. I was just reading this desciption of the top VPI table, which included this ... "The bottom bearing is an oil bath, the PEEK thrust disc on the bottom bearing takes the full 30 pounds total of both platters. We tried levitating the drive platter with opposing ring magnets for less wear but the low end deteriorated as you took off weight. Sorry other table makers, get a set of JBL Everest's and you will hear it too!! Bass requires a good solid footing." |
brucegel OP 145 posts 10-14-2016 2:23pm Geoffkait is correct.But this may be a hurdle less high to jump than previous designs.The question is how serious are they in perfecting this concept.Do they have the engineering chops to do it right. audiophiles have had mag lev devices for twenty years. It’s not really a question of engineering chops. It’s that mag lev has insurmountable problems that makes it uncompetitive with better approaches. LIGO does not use mag lev for any of it’s isolation stages. And they know their isolation. Therefore, I’m out. Looking on the positive side, magnetic sensors are used effectively for active isolation servo mechanisms. |
There is no balm in Gilead. A perfect isoaltion methodology or technique actually doesn’t exist. The negative stiffness, the mag lev, the mass on spring, the air bearing, they all have their Achilles heel (s). And they tend to allow the lowest frequencies up into the thing being isolated. That’s precisely why the LIGO project to detect gravity waves took so long to develop a proper isolation system. But it doesn’t mean you don’t try. |
This is from Kickstarter: https://www.kickstarter.com/projects/245727224/mag-lev-audio-the-first-levitating-turntable |
Well, magnetic levitation is not new but doing this minus a central main bearing probably is. My gut feeling is "East River" but I don’t want to be too premature. My main concern would be that the conventional closed mechanical loop enabling mechanical grounding of the bearing would not exist here. This departure from convention is not unprecedented so it boils down to implementation. Certainly it would mean less noise but the problem for me lies in the fact that you are not only trying to shield the stylus from external interference, i.e. from the support and environs, but that the replay process creates its own energy which must also be "managed". |