Series IV

The Series IV precision pick-up arm owes much to the technology developed for the acclaimed Series V. Although presented at a lower price it retains the unique one-piece magnesium tone-arm, dual-lock base and other advanced features listed.

The Series IV is a worthy relative of ‘the best pick-up arm in the world’ with a sonic performance reflecting the care and attention to detail underlying its design and manufacture.

Series IV Dimensions  
A – Distance from pivot to stylus 233.15mm
B – Distance from pivot to turntable centre 215.35mm
C – Cartridge fixing centres 12.70mm
D – Offset angle 23.635°
E – Linear offset 93.47mm
F – Overhang 17.8mm
G – Height above mounting surface max. 87.90mm
min. 56.40mm
H – Height of record surface above mounting surface max. 57.90mm
min. 26.40mm
J – Depth below mounting surface 56.75mm
K – Radial clearance for balance weight 73.0mm
L – Clearance between cabinet lid and record surface assuming cartridge height at 17.0mm 35.0mm

Additional Information

Build
  • Unique one-piece pressure die-cast tone-arm utilising the advantages of magnesium, replaces conventional fabricated construction.
  • Internal constrained layer damps minute residual vibration leaving the tone-arm acoustically inert.
  • Fine machined cartridge platform, enamel free to avoid interface resonance.
  • Stainless steel cross shaft, ground and thread ground. Carried in massive yoke on 10mm ABEC 3 ball races. Axis at record mean level to minimise warp-wow.
  • Unique assembly gives high rigidity and allows bearings to be critically adjusted before 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 ABEC 7 ball races, widely spaced to resist tilt.
Damping
  • Swivelling damped output socket minimises vibration transmission in sub-chassis use.
Adjustments
  • Anti-skate control operates through tension spring and filament. Dial corresponds 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 damped two-point suspension. Extra-low inertia design assists warp riding.
  • Underslung weight housing corrects centre of gravity and provides non-reflective tone-arm termination. Adjustment leadscrew journalled in twin ball races with lever clamping.
  • Fine adjustment of horizontal tracking angle (HTA).
Specification
Series IV Specifications  
Effective mass 10.0/11.0g
Cartridge balance range 5 – 16g
Vertical tracking force 0 – 3.0g(30mN)
Maximum tracking error 0.012(degrees per mm)
Null points Inner 66.04mm
Outer 120.90mm
Audio lead Length 1.2m
Capacitance 140.0 pF per channel
Resistance 0.145 ohms per conductor
Internal wiring Capacitance 15.0 pF per channel
Resistance 0.535 ohms per conductor
Output plug and socket DIN 5-pole 240°
Weight net 700.0g
Manuals