SME MODEL 20/3A
Giradischi
Codice: 56693185
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Con braccio Serie V GPD
Questo giradischi di precisione è costruito con gli stessi elevatissimi standard che contraddistinguono il Model 20/12, con cui condivide molte caratteristiche progettuali. Braccio cablato con cavi Van Den Hul (Model 20/3A)
This finely engineered precision turntable is built to the same exacting
standard and incorporates many design features originated for the Model
20/12. Massive construction, extensional damping of major surfaces and
lack of vibration from moving parts ensures exceptional detail,
resolution and uncoloured performance.
A turntable should address the
problems of extraneous vibrations. These emanate from numerous sources
including air and structural vibration from loudspeakers, groove
modulation, stray electrical fields and mechanical imperfections in
moving parts. In the Model 20/3, superb instrument quality machining is
allied with fundamental physics. The higher the mass and stiffness of a
body the less it will flex and vibrate; the duration of a vibration can
be shortened by suitable damping.
Model 20/3 weighs approximately
28.6Kg (63lb), significant in relation to its size because it is density
that matters. For example, the same weight of metal spread over a large
enough area would be aluminium foil! The sub-chassis measures only
440mm (17 5/16”) by 350mm (13 ¾”) but weighs 11Kg (24lb). Its thickness
16mm (5/8”) resists flexing at low frequencies whilst high frequency
resonance is attenuated by efficient extensional damping.
Features
Suspension:
No sonic footprint, the sub-chassis is hung on 80 strands of rubber in
the form of 40 purpose moulded ‘O’ rings. An ingenious method of
anchorage allows them to be removed or replaced instantly.
Damping:
A large centrally placed fluid-damper disciplines sub-chassis movement
with a pleasing sense of security when handling records on and off the
platter, offering a resistive ground-path for acoustic signals.
In
addition to a cartridge’s electrical output, mirror image acoustic
signals reacted in the arm and record, will pass into the sub-chassis in
the course of dissipation. However the usual closed loop design does
not address the problem of their differing phase so in the Model 20/12
the structural interfaces concerned have received special attention to
provide paths of the required impedance.
This control of vibration is
fundamental to the design of the player and goes much of the way to
explaining the stunning tonal and dynamic neutrality that it exhibits.
Platter:
6.5Kg (14.3lb) platter. The face is machined with a fine scroll found
to interface better than a plain surface. A substantial reflex clamp
ensures maximum contact with the platter even when severe record warp is
present. The sub-chassis/arm mounting board interface is extensionally
damped and the mounting board is reversible to allow mounting of nine
inch pick-up arms when necessary.
Motor: The turntable is driven
by a 3 phase, brushless outrunner motor with 8-pole Neodymium magnets
and 3 integrated Hall effect sensors and virtually vibrationless by
reason of its 2.5 kg (5.5 lbs) weight as well as being isolated on
urethane mounts that are adjustable for accurate belt positioning.
Speed
Control: The electronic controller uses a high performance
microprocessor, optimised for motor control. Closed loop speed control
is implemented using a proportional plus integral (PI) algorithm. Fine
pitch speed adjustment allows increments/decrements of +/-0.01% of
selected speed. Speed ranges: 33.3, 45 & 78 rpm.
Power: Mains voltages available are 90-110V, 105-125V and 220-240V 50/60 Hz. Please specify when ordering.
Dimensions & Weight:
Dimensions: 440 x 350 x 172mm
Net weight: 31kg (68lb)
Shipping weight: 45kg (100 lbs)
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