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In the Forum: Analog Playback
In the Thread: A longer turntable belt.
Post Subject: Variable speed simplyPosted by drdna on: 2/3/2006
 Romy the Cat wrote:
I am personally inclined toward the BC scenarios.

C allows for manipulation of the Platter 1 bearing with different belt tension in a linear fashion that includes a potential nadir in friction. 

B will hold the bearing fixed in two dimensions with variable force in two dimensions.

 Romy the Cat wrote:
Then I thought to drive one of the platters (I did not decide which one) with one light, “hanging” belt


Driving the higher mass platter yields a more equal distribution of transmitted vibration to each platter.

 Romy the Cat wrote:
The D and F scenarios are fine but I am concerned that with different masses the platters would have different coupling and different micro-slipperage


The flywheel in F allows for equalization of tensions.

 Romy the Cat wrote:
Still, I presume that with this mass that all would be completely irrelevant to the sound, wouldn’t it?


I would be careful making any assumptions.  Use experimental evidence.

 Romy the Cat wrote:
The only concern I have is that both platters would have the identical speed…


E allows for different spindle diameters on the flywheel, which will change Platter 2's speed independently.

Regards,
Adrian

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