Features
• Quartz
synthesizer
system
that for the first time in
the world has made it
possible
to
achieve
a digital
pitch control of ± 9.9% in
0.1
% increments
In conventional quartz players the quartz reference was in effect only
within
strictly
limited
ranges: whenever vernier speed change was
required, the quartz circuit had to be switched off. In the Technics
SP-15,
we
took
the lead by locking the quartz, thus making it possible
to effect a high degree of pitch control accuracy over a range
as
wide
as
± 9.9% in
0.1
% increments, which is below the threshold of human
perception.
Moreover, the pitch control, coupled
with
the clear
digital
indicator,
enables
you to accurately and precisely tune
with
musical
instruments, vary pitch slightly for obtaining a musical note
from
a
record or alter tones by a half-note.
• Oversized turntable that cuts off and absorbs
external vibrations.
Based
on
analyses
of the turntable vibration modes and vibrations in
the sound range, a special viscoelastic material is applied to the
reverse
surface
of the turntable platter for deadening.
The
deadening material is applied to the undersurface and outer
periphery of the turntable platter,
with
the rubber turntable mat on the
surface
settled
into
the turntable platter.
This
design is superior in
acoustic
characteristics
even
at high sound
levels
through
elimination
of turntable
resonance
and absorption of external vibration.
Moreover, the
oversized
aluminum die-cast turntable platter, 33.9 cm
(13-11
/32")
in diameter,
is
heavy
with
2.7
kg
(5.9
lb.)
of
its
own
weight,
with
a moment of inertia of 380 kg-cm
2
(130 tb' in
2
) for large heavy
weight
class
design.
• Vibration damping structure by the precision
aluminum
die-cast
cabinet and TNRC.
The
acoustical characteristics of the player system are inevitably
affected by the turntable platter and cabinet employed. The SP-15
adopts an aluminum die-cast cabinet superior in strength,
with
high
processing
accuracy,
and the new acoustic material
TNRC
excellent
in acoustical properties. Through
cutting-off
and absorption of
external
vibrations, the
unit
is designed for improved acoustic
characteristics,
with
susceptibility to feedback minimized.
•
Electronic
circuits
of more than
3,000
discrete
elements concentrated into 4
ICs
«
The
4 kinds of
IC,
i.e.,
Synthesizer
pitch control
CMOS
LSI
(MN
6042),
Frequency
dividing IC employing l
2
L, ECL (ON 860), phase speed
control IC (AN 660) and Driving IC (AN 640)
into
which high density
electronic circuits of more than 3,000 discrete elements have been
compressed
have made it possible to produce this high precision
quartz turntable.
• Quartz Controlled Rotation
Accuracy
The
SP-15
utilizes the oscillation of a quartz crystal as a reference
signal
or source.
This
oscillation is not affected by temperature
change
or power fluctuations. By synchronizing the
rotation
of the
turntable platter accurately to the reference signal, speed
drift
of the
unit
is held
within
± 0.002%.
•
Technics
1
unique motor
construction
In which the
rotor of the motor
is
integrally formed with the
turntable
• High torque motor of 3 kg-cm with starting time of
0.4
second
is capable of instant
speed
change-over
(at 33-1/3 rpm.).
•
With
the double braking system of the electronic
brake and mechanical brake, the turntable stops
instantly (0.4 second) upon depression of the
start • stop button (at 33-1/3 rpm.)
• High performance with wow and
flutter
of only
0.025% (JIS C5521) and rumble of -78 dB
(IEC
98A Weighted).
• Pitch lock
mechanism
capable of locking the speed
selection
and pitch control operation
Malfunction caused by accidental touching of the operatng
porton
during playing, can be prevented. •
• Highly efficient pulse power supply circuit is
employed for the DC power
source
Since
DC voltage is obtained by oscillating high frequency (20
ifrtr
through
direct rectification of AC power supply for voltage arotnoi
at the pulse transformer, there is no
leakage
of the commoraai pew
source
frequency.
• Stable and positive mechanism that can stand
frequent commercial
use,
etc.
and a switch section
with point
contacts.
3
speeds of 33-1/3, 45 and 78.26 rpm. are employed, takmg
r*:
account commercial and broadcast use.
Specifications
General
Power
supply:
120
V.
50 or 60 Hz
Power
consumption:
11
w
Dimensions:
34.9x9.3x37.2
cm
(W x
H
x D)
(13-3/4x3-21/32x14-41/64
inches)
Weight: 6.2 kg
(13.7
lb)
Turntable section
Type:
Drive method:
Motor:
Drive control method:
Turntable platter:
Moment
of inertia:
Turntable
speeds:
Turntable speed
fine adjustment:
Starting torque:
Build-up
time:
Braking
time:
Braking
system:
Speed
fluctuation due
to load torque:
Speed
drift:
Wow and
flutter:
Rumble:
Weight and dimensions shown are approximate.
Specifications
subject to change
without
notice.
Quartz
synthesizer
pitch control,
Direct drive
Direct Drive
Brushless
DC
motor
Quartz-phase-locked
control
Aluminum
die-cast,
diameter 33.9 cm
(13-11/32
inches)
weight 2.7 kg (5.9 lb)
380
kg-cm* (130 lb. in
2
)
33-1/3.45
and 78.26 rpm
Adjustable up to ± 9.9% in
0.1
%
increments by
digital
indication
3
kg cm
(2.61
Ibin)
0.4
sec.
to
33-1/3
rpm
0.4
sec
from
33-1/3 rpm
Electrical
and Mechanical braking
0%
within
2.5
kg.
cm (2.2 lb in)
Within ± 0.002%
0.025%
WRMS
(JIS
C5521)
±
0.035%
peak
(IEC
98* Weighted)
-56
dB
(IEC
98A Unweighted)
-78
dB
(IEC
98A Weighted)
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Power
Turntable Specifications
Performance
Weight and Dimensions
