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.
Unique one-piece pressure die-cast tone-arm utilising the advantages of magnesium, replaces conventional fabricated construction.
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.
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.
Underslung weight housing corrects centre of gravity and provides non-reflective tone-arm termination. Adjustment leadscrew journalled in twin ball races with lever clamping.
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).
New design alignment protractor sets HTA with great accuracy.
Series IV Dimensions
Series IV Specifications
A - Distance from pivot to stylus
233.15mm
Effective mass
10.0/11.0g
B - Distance from pivot to turntable centre
215.35mm
Cartridge balance range
5 - 16g
C - Cartridge fixing centres
12.70mm
Vertical tracking force
0 - 3.0g(30mN)
D - Offset angle
23.635°
Maximum tracking error
0.012(degrees per mm)
E - Linear offset
93.47mm
Null points
Inner 66.04mm Outer 120.90mm
F - Overhang
17.8mm
Audio lead
Length 1.2m Capacitance 140.0 pF per channel Resistance 0.145 ohms per conductor
G - Height above mounting surface
max. 87.90mm min. 56.40mm
Internal wiring
Capacitance 15.0 pF per channel Resistance 0.535 ohms per conductor
H - Height of record surface above mounting surface
max. 57.90mm min. 26.40mm
Output plug and socket
DIN 5-pole 240°
J - Depth below mounting surface
56.75mm
Weight net
700.0g
K - Radial clearance for balance weight
73.0mm
L - Clearance between cabinet lid and record surface assuming cartridge height at 17.0mm
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