people going nuts... levitating turntable

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Classicrock
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Re: people going nuts... levitating turntable

Unread post by Classicrock » Tue Aug 15, 2017 8:01 am

Lindsayt wrote:
Tue Aug 15, 2017 6:04 am
Geoff.R.G wrote:
Mon Aug 14, 2017 6:32 pm

...The video appears to show the platter wobbling slightly and that must detract from sound quality, it probably also means the speed isn't stable...
Yes, a wobbling platter will be bad.

What might make more sense would be if the whole TT were mag leved. For people who place their TT's on floor mounted stands next to their speakers, as a way to isolate the TT.

It'd need induction power transfer and wireless signal transfer.
I think there is/was an isolation base that does magnetic levitation.

shanewhite
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Re: people going nuts... levitating turntable

Unread post by shanewhite » Tue Aug 15, 2017 8:34 am

Lindsayt wrote:
Tue Aug 15, 2017 6:04 am
Geoff.R.G wrote:
Mon Aug 14, 2017 6:32 pm

...The video appears to show the platter wobbling slightly and that must detract from sound quality, it probably also means the speed isn't stable...
Yes, a wobbling platter will be bad.

What might make more sense would be if the whole TT were mag leved. For people who place their TT's on floor mounted stands next to their speakers, as a way to isolate the TT.

It'd need induction power transfer and wireless signal transfer.
It would also need a way to stop the platter rotating one way and the rest of it rotating the other!
Heybrook TT2 (original steel chassis version)
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EMO Systems E235 phono preamp
Slim Devices Squeezebox 3
WAD KEL84
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Projects:
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Fretless
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Re: people going nuts... levitating turntable

Unread post by Fretless » Tue Aug 15, 2017 8:51 am

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Lindsayt
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Re: people going nuts... levitating turntable

Unread post by Lindsayt » Tue Aug 15, 2017 10:24 am

Classicrock wrote:
Tue Aug 15, 2017 8:01 am
Lindsayt wrote:
Tue Aug 15, 2017 6:04 am
Geoff.R.G wrote:
Mon Aug 14, 2017 6:32 pm

...The video appears to show the platter wobbling slightly and that must detract from sound quality, it probably also means the speed isn't stable...
Yes, a wobbling platter will be bad.

What might make more sense would be if the whole TT were mag leved. For people who place their TT's on floor mounted stands next to their speakers, as a way to isolate the TT.

It'd need induction power transfer and wireless signal transfer.
I think there is/was an isolation base that does magnetic levitation.
Yeah but you'd still have the power and signal cables.

And the platform would need to be matched / adjustable for the mass of the TT. Or able to cope with a wide range of weights.

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Lindsayt
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Marshall Islands

Re: people going nuts... levitating turntable

Unread post by Lindsayt » Tue Aug 15, 2017 10:31 am

shanewhite wrote:
Tue Aug 15, 2017 8:34 am
Lindsayt wrote:
Tue Aug 15, 2017 6:04 am
Geoff.R.G wrote:
Mon Aug 14, 2017 6:32 pm

...The video appears to show the platter wobbling slightly and that must detract from sound quality, it probably also means the speed isn't stable...
Yes, a wobbling platter will be bad.

What might make more sense would be if the whole TT were mag leved. For people who place their TT's on floor mounted stands next to their speakers, as a way to isolate the TT.

It'd need induction power transfer and wireless signal transfer.
It would also need a way to stop the platter rotating one way and the rest of it rotating the other!
Some sort of triangular pyramid arrangement of the magnetic force could do that. You might get a bit of flexure as the platter was started up, but once it was settled it'd only be the variable drag of the stylus plus wind in the room to unsettle it.

You'd also probably want some sort of safety cage arrangement to limit maximum movement. Otherwise if you tripped and fell into it you might bring the whole lot crashing down.

Geoff.R.G
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Re: people going nuts... levitating turntable

Unread post by Geoff.R.G » Tue Aug 15, 2017 1:12 pm

On my first day at college, many moons ago, we saw a demonstration of a linear induction motor, the "rotor" (for want of a better term) shot down the track and hit the end stop with considerable force. I have visions of this thing going haywire and sending the platter spinning across the room rather like Odd Job's hat.

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