ขายเครื่องเล่นแผ่นเสียง PIONEER XL-1551 สภาพสวยมาก สีพิเศษ เสียงดี Made in Japan
ขายเครื่องเล่นแผ่นเสียง PIONEER XL-1551 สภาพสวยมาก สีพิเศษ เสียงดี Made in Japan
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Pioneer XL-1551
¥63,000 (around 1977) explanation
A record player with a quick-stop mechanism added to the XL-1550.
The XL-1551 has a quick-stop (brake) mechanism.
When the control lever is turned off, the turntable stops and you can quickly change to the
next record.
In addition, the exterior has a metallic star finish.
The quartz PLL system is used for the servo circuit.
In this method, the output pulse of the generator mounted on the rotating shaft of the motor is
compared with the pulse of the crystal oscillator to detect the phase difference and maintain the
rotation speed of the motor.
In addition, in order to improve the reliability of the circuits themselves, we are working to convert
circuits to ICs, and we have adopted bipolar ICs for drive circuits and MOS-type ICs for control
circuits.
The drive circuit adopts a bidirectional drive circuit, which operates in the forward and reverse
directions. For this reason, even if the motor speed increases, the electric brake is applied in the
opposite direction, and it can respond quickly. For this reason, even when switching speeds, the
constant speed rotation is immediately achieved.
High-precision control circuits, high-torque direct-drive motors, precision-machined shafts,
bearings, turntables, etc. achieve excellent characteristics.
The strobe uses a single-stripe strobe that is easy to adjust, and a waveform circuit is used that
makes the stripes easy to see.
Conventional speed fine-tuning strobes generally use the frequency of a household AC power
source to irradiate. For this reason, four stripes were required for each power frequency and
speed. On top of that, the frequency fluctuation of the general award power supply is about 0.1%,
making it difficult to fine-tune it with high accuracy.
In the XL-1551, the strobe is lit by dividing the oscillation frequency of the crystal (3 MHz band)
by an electronic circuit, eliminating the influence of fluctuations in the power supply frequency.
In addition, when switching the rotation speed, it is possible to adjust with a single stripe by
changing the divider ratio (33 / 1/3 rpm: 55.5 Hz, 45 rpm: 75 Hz).
In addition, the irradiation current of the strobe is pulsed by a wave-shaping circuit, so the
strobe engraved on the outer circumference of the turntable can be clearly read.
The servo circuit has a built-in CR oscillator. For this reason, even when quartz is turned off,
the PLL (phase control) works, and excellent load-bearing and drift characteristics can be
obtained even during fine tuning.
The drive motor is a high-torque brushless DC servo hole motor, which rotates a large die-cast
aluminum turntable with a diameter of 32.4 cm and an inertial mass of 340 kg·cm2 at a constant
speed within 2/3 turn. The starting torque of this motor is 1 kg-cm.
In addition, the switching mechanism uses the functions of three Hall elements developed
independently, resulting in high signal-to-noise ratio and durability.
The tonearm uses an S-shaped pipe arm.
In addition to reducing the effective mass, this arm uses high-precision angular contact bearings
for vertical and horizontal rotation to reduce friction and achieve high sensitivity.
In addition, a 6-ton aluminum panel is used for the arm mounting base, and the inner surface of
the cabinet is also reinforced with a steel plate (6 mm thick, 700 g weight) to protect the tonearm
from feedback even during ultra-low frequency reproduction.
The headshell is made of aluminum alloy and is made of non-resonant type, which reduces
the mass.
The cartridge is PC-330/II, which is an MM-type cartridge.
The cantilever of this cartridge is made of titanium pipes that have been subjected to special
heat treatment. It is light at 0.45 mg and has little deflection, so the mechanical impedance is
kept low and the tracing capacity is increased.
The cabinet is made of a combination of parchle board.
It is equipped with an arm height adjustment mechanism that can be adjusted at a height of ±5 mm
from the reference position.
It is equipped with an anti-skating mechanism.
The turntable seat is made of butyl rubber.
It uses an insulator that combines special rubber and die-cast solid.
The insulator is also adjustable in level, with a variable of 0.5 mm per revolution of the insulator.
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Model Ratings
Model Quartz PLL Direct Drive Player
<Turntable part>
motor Quartz PLL Hall Motor
Drive system Direct-drive
turntable 32.4cm diameter die-cast aluminum
Turntable inertial mass 340kg-cm2
Rotation speed 33·1/3, 45rpm
Rotation speed switching electronic
Rotation speed fine-tuning range ±6%
Uneven rotation Less than 0.025% (WRMS)
S/N 62dB(JIS)
70dB(DIN-B)
Load fluctuations 0% (needle pressure within 120g)
Startup characteristics Within 2/3 turn
Speed deviation 0.003% or less
Temperature drift 0.00004%/°C or less
Time Drift 0.0003%/h or less
< tonearm section>
format Static Balanced S-Shaped Pipe Arm
Arm Effective Length 221mm
overhang 15.5mm
Compatible cartridge self-weight 4g~14.5g (9.5g or more subweight)
Height adjustment range ±5mm
Cartridge section>
format Model MM (PC-330/II)
structure Shield Case: Super Permalloy
Frame: Die-cast aluminum alloy
Needle 0.5mil Diamond
Effective mass of oscillating system 0.45mg
Needle pressure range 1.0g~1.8g(1.5g)
Frequency response 10Hz～28kHz ±3dB
Channel Separation 25dB or more (1kHz) 20dB or more (100Hz~10kHz)
Output voltage 3mV(1kHz、50mm/sec、RMS)
Output Balance Within 1 dB (1 kHz)
Dynamic Compliance 12x10cm-6/dyne (100Hz, horizontal and vertical)
Static Compliance 18x10cm-6/Dyne (Optical)
Output impedance 2kΩ(1kHz)
Load Resistance 30kΩ~250kΩ (Suitable 47kΩ+170pF)
prudence 6.4g
size Width 14.8 x Height 17 x Depth 290 mm
Retracted Dimension JIS and EIA Standards
Replacement needle PN-330/II
< Other>
Ancillary mechanism Anti-skating mechanism
Lateral balancer
Needle pressure direct reading weight Arm height adjustment mechanism
Quick stop mechanism
Arm elevation mechanism
Headshell stand (EP adapter shared)
Strobe Lamp
Free Stop Hinge
Insulator with Height Adjustment
Supply voltage AC100V、50Hz/60Hz
Power Consumption 5W
External dimensions Width 490 x Height 185 x Depth 390 mm
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