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Originally Posted by Chad Hauris
The idler wheel size makes no difference in the speed when there is a 3-component system in a phono (motor shaft, idler wheel, turntable)...what does, are the diameter of the motor shaft and the inside diameter of the turntable. The idler just has to physically fit between the two...it is just a "go-between" and has no influence on the speed of the turntable.
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You're absolutely right - I totally forgot about that.. It's been a while since I tried to work on an idler drivin turntable. Thinking belt/pully here... OK, so it seems I have a lot to learn about this vintage phonograph - I guess I just never got too deep into trying to repair them - I'm more of a TV, Hi-Fi and computer guy myself. Bah - that's no excuse, I just need to shut up unless I'm more than 100% sure that what I have to say is useful.
-Ian