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Ortofon RS-309D 12" dynamic-balance tonearm

RS-309D 12 inch Ortofon’s D series tonearm takes analog sound reproduction to a higher level with highly configurable VTF options and a dynamic balance system for increased stability when tracking warps and other anomalies.

D series tonearms can be used for a wide array of cartridges, feature anti-skating control.


  • Dynamic balance graduated vertical tracking force (VTF) control through a new spring design
  • The new short wire spring, housed in the pivot case, eliminates unwanted vibrations in the tone arm
  • VTF in the range 0-5 grams can be precisely adjusted by means of the supplied digital force gauge
  • Anti-skate control adjusted by calibrated dial in the range 0-5 gram
  • Tone arm height, and thereby VTA, is easy adjustable on the tonearm base.
  • Detachable head shell and tone arm cable, with standard SME-type connectors

Please note: The AS-212S, AS-309S, RS-212D and RS-309D tonearms have a Japanese geometry, which will not directly fit the normal Baerwald alignment. Baerwald alignment has a zero tracking angle error at 66mm and 120.9 mm distance from the center of the platter.

Please read our recommendations for alignment of RS and AS tonearm models here.

RS-309D 12" tonearm Technical data

Effective mass (without headshell)  - 4.0 g
Effective length (distance between the stylus and pivot point)  - 329 mm
Mounting distance between the pivot point and turntable center  - 314 mm
Offset angle  - 19 degrees
Overhang  - 15 mm
Tracking force adjusting range (direct reading)  - 0-5 g
Height adjustment range  - 42-57 mm
Diameter of  the armbase mounting hole - 34-36 mm
Diameter of the center shaft  - 16 mm
Fixing holes PCD  - dia. 50 mm
Size/Thread  - dia. 3.2 mm (dia. 3 mm x 20 mm and dia. 3 mm wood screw)
1 x Digital scale DS-1 included
1 x Headshell SH-4 Black included, headshell weight 9.4 g, screws weight 2 g
1 x Tonearm cable included
1 x Mounting template included