SME Series 312-S

Planet Audio

Magnesium 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.

 

  • 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
DIMENSIONS
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 17.28º
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 73.00mm
SPECIFICATIONS
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