SME Tonearm IV

SME Tonearm IV

Precision 9inch Tonearm

SME Tonearm IV
SME Tonearm IV
Not available separately.
AVAILABILITYN/A

he 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

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).

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