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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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gjaky
Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary
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Link Posted: Wed Jan 16, 2019 8:05 am Post subject: |
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Interesting, although the plate was waggling all the time, that is not so good...
_________________ projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Link Posted: Wed Jan 16, 2019 8:39 am Post subject: |
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gjaky wrote: | Interesting, although the plate was waggling all the time, that is not so good... |
Yep I wonder if this is more proof of concept?
I'd like to see the laser reader at the smithsonian.
_________________ Tech support for nothing
CRT.
HD done right!
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gjaky
Joined: 05 Jun 2010 Posts: 2790 Location: Budapest, Hungary
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Link Posted: Wed Jan 16, 2019 10:12 am Post subject: |
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It is interesting as a concept, but for sound this does not do much I think. Being mag lev makes the plate friction nonexistent, so eliminating the rumble of the plate bearing -which is good. But this is a direct drive plate after all, which on the other hand has some sort of unevenness in the angular velocity since the drive electronics have finite pole number -which is bad.
All the high-end turntables use heavy plates with belt drive to overcome the later problem. Manufacturer Clearaudio (and others probably too) has a good compromise, as they also using magnetically levitating plate, but they are still using a ceramic axle as a guide for the plate, so they can use belt drive. One can argue that the belt drive still cause friction even with the ceramic axle drive but then you can use multiple motors (symmetrically positioned) to even out the belt’s side deflection force, or even better use magnetical coupling for the main plate underneath...
_________________ projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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