SME Model 312-S Tonearm


Model 312-S Tonearm

The Model 312S precision pick-up arm is an extension of the popular Series 300 range designed with maximising performance and ease of use in mind. It has a detachable magnesium headshell to provide the convenience of rapid cartridge interchange whilst maintaining a degree of rigidity normally only associated with arms of one piece design.

The 12 inch magnesium construction takes advantage of the reduction in Maximum tracking error/distortion afforded by the greater arm length when compared with 9 inch models.

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  • The 12in pressure die-cast magnesium construction takes advantage of the reduction in maximum tracking error/distortion afforded by the greater arm length when compared with 9in models.
  • Unique pressure die-cast magnesium shell detachable and interchangeable without disturbing cartridge or wiring.
  • Design of headshell clamping ensures a rigid junction with the tone-arm.
  • Internal constrained layer damps minute residual vibrations making tone-arm acoustically inert.
  • Stainless steel cross shaft, ground and thread ground. Carried in massive yoke on 10mm precision ball races.
    Axes at record mean level to minimise warp-wow.
  • Unique assembly gives high rigidity and allows bearings to be critically adjusted before the tone-arm is fitted.
  • Stainless steel vertical shaft, ground and thread ground, with integral 16mm diameter flange to couple shaft and yoke.
  • 23mm diameter steel pillar, heat treated, ground and honed, carries two 17mm precision ball races, widely spaced to resist tilt.
  • Anti-skate control operates through tension spring and filament. Dial calibrated to correspond with VTF and has positive OFF position.
  • Lowering/raising control gives smooth positive action. Height of lift can be adjusted.
  • Dual-lock base provides movement control with high rigidity.
  • Tungsten-alloy balance weight carried on two-point suspension. Extra-low inertia design assists warp riding.
  • Underslung weight housing corrects centre of gravity and provides non-reflective tone-arm termination.
  • Swivelling, damped output socket minimises vibration transmission in sub-chassis use.
  • Reference lines on tone-arm facilitate VTA setting.
  • Fine adjustment of horizontal tracking angle (HTA).
  • Alignment protractor designed to provide HTA setting with greater accuracy.
  • Cartridge leads and internal wiring in Silver litz.
  • Balanced Silver-hybrid audio lead with gold plated phono plugs.
Chrome Finish Option

A special chrome finish option is available for the Model 312-S.



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  • A – Distance from pivot to stylus: 308.80mm
  • B – Distance from pivot to turntable centre: 295.60mm
  • C – Cartridge fixing centres: 12.70mm
  • D – Offset angle: 17.28°
  • E – Linear offset: 91.54mm
  • F – Overhang: 12.60mm
  • G – Height above mounting surface: max. 87.90mm, min. 56.40mm
  • H – Height of record surface above mounting surface: max. 55.90mm, min. 24.40mm
  • J – Depth below mounting surface: 56.75mm
  • K – Radial clearance for balance weight: 73.0mm
  • Effective mass: 14.0g
  • Cartridge balance range: 7.0 – 19.0g
  • + One accessory weight – up to: 24.5g
  • + Two accessory weight – up to: 30.0g
  • Maximum tracking error: 0.009°/mm
  • Null points: Inner 63.62mm, Outer 119.46mm
  • Internal wiring: Ultra-flexible Silver litz
  • Audio lead: Length 1.2m
  • Weight net: 820.0g


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