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In the Forum: Analog Playback
In the Thread: Ultimate Turntable
Post Subject: Thicker OilPosted by hagtech on: 3/17/2008
Paul, I think that is a very good observation. Seems to me that a really thick grease or oil in a large bearing would offer enough friction such that the motor was always biased into an active positive torque region. Such would be the equivalent of biasing heavier into class A, as opposed to class AB in a frictionless system. I think of the motor/belt/platter/stylus as an analog to a single-ended output stage. The motor can pull or coast, resulting in a non-linear system. If in a servo loop, it speeds up faster than it can slow down. I think oil friction might be a good solution to biasing a motor into a more linear operating region. They key is to minimize the noise of the friction. It must be as constant as possible.
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