Quote:
Originally Posted by TV Engineer
This is completely incorrect. The diameter of the idler is critical to correct rotational speed.
Notice that there are four diameters of the motor shaft, representing the 4 available speeds. What difference does it make whether you change the diameter of the motor shaft, or the diameter of the idler wheel, or even the diameter of the driven surface of the platter? Changing any of the three will affect the speed of the turntable.
There were many changers built in the 1950s that actually used different idler wheels for different speeds. Webcor, RCA, and VM are just a few that come to mind.
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No, the ratio of the capstain to the idler is reversed by the ratio of the idler to the platter; therefore the idler size does not matter - it only changes the idler RPM.