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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 / 3 2 " ) in diameter, is heavy with 2.7 kg (5.9 lb.) of its own weight,
with a moment of inertia of 380 kg-cm
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
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%.
1
• 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.)
2
(130 tb' in
2
) for large heavy
«
2
L, ECL (ON 860), phase speed
• High performance with wow and flutter of only
0.025% (JIS C5521) and rumble of - 7 8 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 a r o t n o i
at the pulse transformer, there is no leakage of the commoraai p e w
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:
Quartz synthesizer pitch control,
Direct drive
Drive method:
Direct Drive
Motor:
Brushless DC motor
Drive control method:
Quartz-phase-locked control
Turntable platter:
Aluminum die-cast, diameter 33.9 cm
(13-11/32 inches) weight 2.7 kg (5.9 lb)
Moment of inertia:
380 kg-cm* (130 lb. in
Turntable speeds:
33-1/3.45 and 78.26 rpm
Turntable speed
fine adjustment:
Adjustable up to ± 9.9% in 0.1 %
increments by digital indication
Starting torque:
3 kg cm (2.61 Ibin)
Build-up time:
0.4 sec. to 33-1/3 rpm
0.4 sec from 33-1/3 rpm
Braking time:
Electrical and Mechanical braking
Braking system:
Speed fluctuation due
to load torque:
0% within 2.5 kg. cm (2.2 lb in)
Within ± 0.002%
Speed drift:
0.025% WRMS (JIS C5521)
Wow and flutter:
± 0.035% peak (IEC 9 8 * Weighted)
- 5 6 dB (IEC 98A Unweighted)
Rumble:
- 7 8 dB (IEC 98A Weighted)
Weight and dimensions shown are approximate.
Specifications subject to change without notice.
•
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