Vinyl Asylum

Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

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Re: Sounds like it is a unipivot arm

Posted by wskitche on June 18, 2001 at 01:59:55:
The last sentence should read "Be sure to do this adjustment before doing vtf stuff, as a move of this weight can throw off vtf"
Not "...off vta"
VTA has nothing to do with this... sorry.
vtf = vertical tracking force, in grams, the amount of pressure with which your stuls presses downupon the record
OK i'll slow down, there are two basic types of arm bearings, a standard type, which has two pivots, one, that allows for movement in the vertical direcition... allows arm to move up and down. THe other allows the arm to move from the outside edge of the record to the inside (on the horizontal plane). A 2 pivot arm bearing of this type would allow not allow the cartridge to roll to one side or another freely, this allows the manufacturer to not really consider how an "s" shaped arms weight is distibuted. THus no second counterweight
BUT... A unipivot is different, the bearing is a single point, analagous to balancing a ruler on the tip of a nail. This allows the arm to move in the two dimensions listed above, but it also allows the cartridge to rotate from vertical with the record as shown in the pic. Since one side of an s-shaped arm will weight more than the other (blue part of illustration). THis would make that side of the cart torque down. To counteract this , you need an additional counterweight on the lighter side of the arm(red part), which needs to be adjusted depending upon the mass of the headshell and cart. Of course, you would want to adjust the counterweight so that the bottom of the cartridge is parallel to the record surface.
Check out stuff in the faq about tt and cart setup.
Hope this wasn't too jumbled.
-Scott