Advertisement
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 possibte
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 slighlly for obtaining a musical note from a
record or aller 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 plaller for
deadening.
The deadening material is applied to the undersurface and outer
periphery of the turntable plaller, with the rubber turntable mat on the
surface sellied into the turntable plaller. 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-casl turntable plaller
,
339 cm
(13-11/32") in
diameter,
is heavy with 2.7 kg (5.9Ib.)of its own weight
,
with a moment of inertia of 380 kgcm
2
(130 lb·
in'
) 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 plaller 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 culling-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 41Cs
The 4 kindsof IC
,
i.e.
,
Synthesizer pitch control CMOS LSI (MN 6042),
Frequency dividing IC employing 1
2L,
ECL (DN 8OO), 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 plaller accurately to the reference signal, speed drift of the
unit is held within
±
0.002%
.
• Technics' 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 I.ock mect:'anism capable of locking the speed
selection and pitch control operation
Malfunction caused by accidental touching of the operating portion
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 kHz)
through direct rectification of AC power supply for voltage conversion
althe pulse transformer, there is no leakage of the commercial power
source frequency
.
• Stable and positive mechanism that can stand
frequent use for business use, etc. and a switch
section with point contacts.
Revolutions at3 speeds of
33-1/3,
45 and 78.26 rpm
.
are employed,
taking into account business
use.
Specifications
General ----------------------------------
Power supply:
120
V,
50 or 60 Hz
Power consumption:
I1W
Dimensions:
34 .9
x
9.3
x
37 .2cm
(W
x
H
x
D)
(13-3/4
X
3-21 /32
x
14-41/64 inches)
Weight:
6.2 kg
(13.
71b)
Turntable
section-------------------------
Type:
Quartz synthesizer pitch control,
Direct drive
Drive method:
Direct Drive
Motor:
Brushless DC motor
Drive control method:
Quartz-phase-Iocked control
Turntable platter:
Aluminum
die-cast,
diameter 33.9 cm
(13-11/32 inches) weight 2.7 kg (5.9Ib)
Moment of inertia:
380 kgcm
'
(130 lb
.
. in
2
)
Turntable speeds:
33-1/3. 45 and 76.26 rpm
Turntable speed
fine
adjustment:
Adjustable up to
±
9.9%
in 0.1
%
increments by digital indication
Starting torque:
3 kgcm (2.61 Ib·in)
Build-up time:
0.4 sec. to 33-1/3 rpm
Braking time:
0.4 sec from 33-1/3 rpm
Braking system
:
Electrical and Mecanical braking
Speed fluctuation due
to load torque:
0%
within 2.5 kg
.
cm (2.2 lb· in)
Speed drift:
Within
±
0.002
%
Wow and flutter
:
0.025% WRMS (JIS C5521)
±
0.035% peak (IEC 98A Weighted)
Rumble
:
-
56 dB (IEC 98A Unweighted)
-
78 dB (IEC 98A Weighted)
Weight and dimension shown are approximate
.
Specifications subject to change without
notice.
- 6
Advertisement
