Tonearms — J.Sikora KV12

The KV12 is a 12 inch oil-damped unipivot tonearm designed by Janusz Sikora, owner and chief designer of the Polish turntable maker J.Sikora. Its armtube is made of Kevlar, and the company presented it as the first tonearm built around that aramid fibre. It was sold with or without the on-the-fly VTA tower, and around 2019 the European prices were EUR 6,000 with VTA and EUR 4,500 without.

Key specs that matter

Effective length is 304.8 mm, and the pivot sits 291 mm from the spindle, which puts overhang at 13.8 mm. Effective mass is 13 g. The arm alone weighs 890 g, rising to 1,030 g with its armboard and 1,115 g once the VTA assembly is fitted. The VTA assembly itself accounts for 225 g. Two finishes were listed - natural yellow Kevlar as standard and lacquered black matte as an option.

Engineering and use context

Apart from the Kevlar tube, the structure combines parts in aluminium, cast iron, bronze and stainless steel. A single pivot point carries the arm, and an oil bath around the bearing controls its movement so the tube does not rock freely on the point. Signal runs through mono-crystal silver wire made for the arm by Albedo, another Polish company, in one continuous length from the cartridge pins to the RCA plugs with no joints along the way. The headshell is a flat metal plate with elongated slots so the cartridge can be slid forward or back during alignment. Two counterweights come in the box. The larger one carries a single screw for azimuth adjustment, and the smaller threaded one allows fine tracking force setting. The optional VTA tower uses a horizontal wheel, so arm height can be changed while a record plays. Anti-skating comes from a very small, light weight hung on a thread.

Pairing

The arm needs a deck with an armboard or plinth cut for its geometry, and J.Sikora lists a matching 140 g armboard in the arm configuration. With this effective mass the arm falls in the medium range, so low to medium compliance moving coil cartridges are the natural match, and the two counterweights cover lighter and heavier bodies. The tonearm cable ends in RCA plugs, so the phono stage needs single-ended inputs or an adapter.

Alternatives

The J.Sikora KV12 MAX keeps the same geometry but moves to a lighter, stiffer conical Kevlar tube with a zirconium oxide bearing and gold-plated copper wiring.