As in a classical motor, the rotor is driven by the stator due to electromagnetic interaction. Nothing physically touches the rotor (in this case, synonymous with the platter) in a motor
What about the bearing?
Direct Drive
I am firmly in the digital camp, but I’ve dabbled in vinyl. Back in the day I was fascinated by Technics Direct Drive tt, but couldn’t afford them. I was stuck with my entry level Gerrard. I have been sans turntable for about 5 years now but the new gear bug is biting. I am interested in the Technics 1500 which comes with an Ortofon Red and included pre amp. I have owned Rega P5 which I hated for its speed instability and a Clearaudio Concept which was boring as hell.
Direct Drive was an anathema to audiophiles in the nineties but every time I heard one it knocked my socks off. What do the analogers here think of Direct Drive? I listen to Classical Music exclusively
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@mijostyn - I was surprised to hear you prefer the Thorens over the SOTA that you have gushed about in the past. |
@sokogear , Why? A Sota Sapphire with a Kuzma 4 Point 9 is $8000. The Thorens is 1/2 the price. |
Ketchup, I take the bearing as a given for any turntable of any type. So there is no special problem of a bearing in a DD type. All platters ride on some sort of bearing. Mijostyn, I don't know precisely how a Cosmos is constructed, but I do know that SOTA have improved upon basic design of a suspended BD. When you mention a "separate platform" for the motor, it must nevertheless be either suspended along with the bearing and platter or fixed in space. Which is it? How is the platform isolated from the subchassis or shelf? I'm just curious, not contentious. You wrote, "Above that frequency such as at pulley speed all vibration is absorbed by the belt. Nothing gets to the platter." Come on. Nothing designed by men is that perfect. The belt is a filter with a certain cut off frequency and rate of attenuation of mechanical energy. |
@mijostyn - gotcha. I thought the Sota was around $4K. Also thought you like Schroeder arms. You should be a turntable market analyst/consultant. BTW the record clamp/device I asked you about works nicely, really for thinner or warped records - the Hexmat Molecula. Really it is the only option for light. short spindle tables that strongly discourage putting any weight on the platter. Also, their record isolator (mat), the Hexmat Eclipse, also is an improvement over any other mat I have tried (felt, polymer-Herbie's, and rice paper). They are pricey items, and they make a less expensive isolator, the Yellow Bird, but compared to the price of a good TT, worth considering. I know you are the heavy platter, stick the record to the platter proponent, but I think the isolation of the record barely touching the platter (1 sq. mm surface area makes sense, and more importantly sounds nice. |
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