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In Reply to: RE: It always struck me ... posted by Lakeshore Larry on August 19, 2014 at 06:00:11
Aside from not really believing that a massive platter and a lot of inertia NECESSARILY relate to outstanding (not merely good) speed stability, I can understand that it may look that way. But moving from a very heavy-plattered belt drive to a somewhat lighter (but still weighty) Lenco idler-drive, suitably modified, told me differently. Told my ears AND my strobe. The modded Lenco cost less than the massive belt-drive, BTW
Follow Ups:
Greater mass = greater inertia is basic physics, can't get more fundamental than that.
Seriously? A Lenco with a tapered drive shaft and a continuously variable vertical idler wheel leaving skid marks on the underside of the platter is a paragon of speed stability? Yeah, good luck with that....
Funniest thing I've read all week. And linking to someone else who doesn't know what he doesn't know. Like you say, good luck with that :-)
Since you are a little light in the physics department, let me enlighten you:The idler wheel is vertical and perpendicular to the drive surface where it meets the platter. If the idler wheel is rotating at a constant speed (not possible since it is driven by an induction motor rather than an AC synch motor, so its speed varies with torque), then the contact surface of the platter at the outer edge of the idler will be trying to move faster than the contact surface at the inner edge of the idler (again, basic physics/geometry). Therefore, at least part of the idler wheel will always be off speed from the platter where it is making contact, and yes it will "skid" across the surface creating noise. Depending on which part of the idler wheel has the greatest influence at any given time will also determine the speed of the platter creating W&F. Also, the area of contact between the idler and the platter is not a "point", but a line. The center of that line is the only point that is at a correct angle to platter rotation, all other points are on a tangent to the arc made by the rotating platter which will also create skidding, noise and W&F. It's amazing they even attempted a drive system this bad.
I think the moderator said it best when he referred to the Lenco table as a "lawnmower".
Edits: 08/20/14
... let me just sign off with a few notes.
Doesn't it seem a bit strange to you that there's this large site devoted to all things Lenco? The one you linked to, but obviously didn't read.
I'm sure all the idler-drive people are a little light in the physics department (like Mosin here, for instance) but they do understand things you don't. And won't, until you actually hear one. Which isn't likely, I know.
I can put on a record, check with my 10" KAB strobe disc that the speed is rock solid -- no need for an SDS or other speed controller -- and then put stylus to groove on a 12" record while noting that the strobe disc still says there is zero needle drag or any other effect on the rock-solid speed. No motor noise either. Dead quiet.
Granted, my Lenco has been modified and breathed upon by the guy who modded the table that Arthur Salvatore* calls the best turntable he has ever heard.
There are many things you seemingly don't know about the way turntables sound, and why, Larry. But that's okay. Neither did I, pre-Lenco.
* Look him up. Or don't.
There's large web sites devoted to shaving your head, piecing holes in your body and covering yourself with tattoos; it doesn't mean the participants are necessarily the smartest guys in the room.
Since you haven't refuted any of the points I made with physical facts, I'll assume you at least agree and perhaps even, understand.
The fact you use a strobe and think that is high tech and the final word says it all.
I'm glad you think your table sounds better than anything else in the world (it's really not than unusual of a phenomenon). As they say, ignorance is bliss. With that, I wish you blissful listening....
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