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Old 26th September 2003, 05:47 PM   #11
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speaking of mass and moment (and i hope this isn't far off topic), does anyone know where/how to find/make a nice balanced flywheel for turntable use? to my mind it seems more mass-efficient -- if also more labor-intensive -- to use a heavy 'ring' with most of the mass at the perimeter of the circle. (mass at the center doesn't do much for you, inertially.) any ideas?


/andrew
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Old 26th September 2003, 06:23 PM   #12
krishu is offline krishu  Europe
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Dear Andrew,

you can buy those rings ready e.g. from Clearaudio or read Michael Fremer's last column in Stereophile.

Cheers
Christian.
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Old 26th September 2003, 06:26 PM   #13
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the other item which Linn made a great deal of was the bearing upon which the platter rotates

but speaking of wheels and rings etc --- in there is a US company which manufactures a flywheel device for energy storage -- as you describe -- I think that Ingersol Rand owns a piece of it.
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Old 26th September 2003, 09:44 PM   #14
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Quote:
Before I upgraded from my Thorens to Linn LP12 about 15 years ago I read a lot of the material relating to motor control -- and just as you mention, the electronic means of control with an unsatisfactory feedback system -- i.e. an LM317 -- weren't sufficient for the Golden Ears of Linn-Land. If I can find some of the stuff I will post it.
This doesn't seem to make a whole lot of sense - Linn use an AC motor which requires no controller at all - just a cleanish 50Hz which a 317 obvioulsly cannot do.
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Old 26th September 2003, 11:53 PM   #15
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Quote:
Originally posted by analog_sa


This doesn't seem to make a whole lot of sense - Linn use an AC motor which requires no controller at all - just a cleanish 50Hz which a 317 obvioulsly cannot do.
No, Linn has (had) a whole range of power supplies for the LP-12 -- here's an article on the Linn Lingo: http://www.stereotimes.com/acc030903.shtm

oh, an LM317 can be used to regulate an A.C. waveform, or at least clip it at regular levels -- just look at the National Semi ap-notes. I wouldn't say that it's very good at it, not its intended purpose...people have been known to modulate the control pin!
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Old 27th September 2003, 12:23 AM   #16
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Hi,

Just don't get me started on anything LINN, please?

Unless you insist on discussing the biggest ripp-off company in history?

Facts apply mainly to the later mid-eighties designs:

-Close tolerance turned into casserole fits for platter, bearing whatever.

-Add-ons like Lingo only made things worse.

- Felt mat used to cover design deficiencies akin to using too much feedback.

-How many people can set one up to make it sing? Regardless of coluorations?


All in all a flawed design that occasionally played a tune ( Linn-speak).

Not to mention these guys attitude towards the clientele and pundits...even Coca Coala could take a lesson here.

Absolutely outrageous...

Brett,

I don't know of any Nottigham Analogue design that needs a hand start and I all know them inside out.
I'm very familiar with Tom who's as helpful as I can possibly imagine.
Could it be the belt needs replacing?

Cheers,
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Old 27th September 2003, 12:51 AM   #17
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Quote:
Originally posted by fdegrove
Brett,

I don't know of any Nottigham Analogue design that needs a hand start and I all know them inside out.
I'm very familiar with Tom who's as helpful as I can possibly imagine.
Could it be the belt needs replacing?

Cheers,
Hi Frank,

I'd read so many comments about hand starting from people that I presumed it was built into the design. With no off switch and a low powered motor designed to stall wih a manually stopped platter, it made sense to me.

Nonetheless it still makes sense for a DIY design, rather than trying to find a high powered, low noise/vibration motor, affordably.
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Old 27th September 2003, 01:52 AM   #18
Tuukka is offline Tuukka  Finland
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a few days ago i was at work on my car, in the middle of an engine overhaul and being a fanatic i also took the time to re-paint a few brackets and accessories including the cooling fan and motor.

i am also about to start building a TT and ran in to the same dilemma. so i took a look at the little motor for the fan and thought that this is almost a perfect size. i've yet to find out how quiet they are on their own or how much current they draw as per volt, but it might be worthwhile to stop in at a junkyard and pull out an old cooling fan or two to try out.
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Old 27th September 2003, 03:50 AM   #19
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where have i heard about someone using a disk drive motor...either a floppy disk, or a hard drive, i can't remember which.
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Old 27th September 2003, 04:39 AM   #20
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Quote:
Originally posted by faustian bargin
where have i heard about someone using a disk drive motor...either a floppy disk, or a hard drive, i can't remember which.
Usually floppies, but they're steppers so need some control cctry. A 400 step/rev motor running> 300rpm should be smooth enough, and have a fair bit of torque. Can often be found surplus too. Not hard to drive if you're imaginitive with how to do it.
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