Technics SP-10 MkII Quartz-Controlled Direct Drive
Turntable
Represents a
standard of accuracy and quality in disc reproduction that has never been
attained before. This truly outstanding three speed package unquestionably
constitutes a new reference against which professinal systems will have to be
measured for years to come. Just glance at some of these amazing features;
almost total absence of speed drift; immeasurably small wow & flutter;
extreme quietness; enormously high torque, and practically instantaneous
starting and stopping.
The SP-10
MkII employs a sophisticated electronic sevo control circuit to deliver
expressed mathematically, rotational speed accuracy. Speed drift remains within
±0,002%. During the 30 minute playing
time of the average LP side, this amounts to a maximum of ±0,036 seconds error.
This makes the rotational speed independent of AC power line fluctuation and
the passage of time.
The secret
behind this amazing speed control is the
is the ingeneous quartz oscillator which produces an unvarying reference
frequency to which the motor and the strobe light are locked. The quartz
reference frequency is split by a frequency divider into appropriate control
frequencies for each of the 3 speeds. Then the frequency generator translates
platter RPM into a signal which is fed nto the phase control and speed control
circuits which then alter the motor voltage by just the right amount to
maintain the correct speed in response to changing load conditions.
This
corrective current, by being phase locked to the reference frequency, permits
instant corrective torque response when needed. The overall result of this
circuitry shows up very impressively in two of the most revealing measurements
of turnyable quality. Wow & flutter are a low, low 0,025% (WRMS) while
rumble is -73 dB (DIN B).
Another
exclusive feature of this state-of-the-art. Instrument is its extremely high
torque of 6 kg-cm (5,2 lb-in) higher than that found in any other turntable.
This means that rated speed will be maintained even under the most severe
conditions of external drag. No longer will you hear a speed change when
placing a disc preener on the record or even when accidentally brushing against
the rotating platter. At 33⅓ rpm, the rated speed of the Sp-10 MkII is reached
within 0,25 seconds. This compares with the one second built-up time considered
satisfactory in professional broadcast equipment.
Looked at
another way, standard speed is reached after only a 25 degree turn of the
platter. This short build-up time is achieved without sacrifice to the platter
weight, which is a heavy 2,9 kg (6,4 lb). Not only does the Sp-10 MkII have a
short build-up time, but it also is able to stop almost instantly. From the
moment the stop button is pushed until the turntable stops requires only 0,3
seconds, which facilitates rapid speed changes. And whenever the platter is not
running, the mechanical braking system holds the platter still.
For extra
operating convenience, stop and start functions may be controlled from a remote
control unit which comes wirh the SP-10 MkII.
The power
supply, housed in a separate cabinet, isolates the transformer from the
electronics of the turntable and also permits a slim, elegant appearance for
the SP-10 MkII. Other features include modular circuit construction for ease of
servicing and a specially designed rubber mat on the under-side of the platter
for vibration damping.
Specifications
SL-10 MkII
Turntable
Section
Type: Direct drive turntable
Motor: Electronic rectification, quartz-controlled
phase-locked servo circuit, brushless DC motor
Turntable
Platter: Aluminum diecast
Diameter: 320 mm (12-19/32")
Weight: 2,9 kg (6,4 lb
Moment
of Inertia: 380 kg/cm² (130
lb/in²)
Turntable
Speeds: 33⅓, 45 and 78 rpm
Starting
Torque: 6 kg/cm (5,2 lb/in)
Build-in
Time: 0,25 sec (=25° rotation) to 33⅓
rpm
Braking
Time: 0,3 sec (=30°rotation) from 33⅓
rpm to standstill
Soeed
fluctuation by load changes: 0% within 5
kg/cm (4,3 lb/in)
Speed
Drift: Within ±0,002%
Wow and
Flutter : 0,025% WRMS (JIS C5521) ±0,035% weighted, zero to peak (DIN 45507)
Rumble: -50 dB (DIN 45539 A); -73 dB (DIN 45539B)
General
Power
Supply: AC 120 V - 240 V, 50/60 Hz
Power
Consumption: 20 W
Dimensions
(H x W x D): 102,5 x 368,5 x 368,5 mm (
4-1/64" x 14-31/64" x 14-31/64")