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

RE: Drop counterweight

" dropped counterweight". I assume that you mean a counterweight whose position lies below the pivot point of the arm?

The stock JMW counterweight is effectively of this type. Its mass is not distributed evenly around the rear of the arm tube but mainly below the tube and below the pivot i.e. it has a low centre of gravity. This increases stability particularly when tracking warps. It is an essential consideration for unipivot arms.

With the JMW unipivot design the fact that the mass of the counterweight is not evenly distributed but eccentrically means that not only does it set cartridge VTF by movement fore and aft but also azimuth by movement side to side. A point to bear in mind when considering any replacement as also is its total weight which should be such that its position to balance the cartridge is as close as possible to the pivot for lowest inertia.

I cannot see any advantage in replacing the stock JMW counterweight for a "dropped" design as it is, effectively , one where the main mass is already placed below the pivot.

"We need less, but better" - Dieter Rams


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