Audio Database

SR-630
Commentary

A record player that employs the quartz lock servo system.

In the quartz-lock servo system, the output of the FG (frequency generator) is compared with the phase of the reference oscillator for servo control. By using a highly stable crystal oscillator as the reference oscillator, we have succeeded in suppressing speed deviation within 0.003%.

A stop mechanism is adopted in which when the stop button is pressed, the power of the drive circuit is turned off and a brake works to stop the rotation of the turntable.
It is a mechanical system by combination of electromagnetic plunger and lever, and stops at about 1/3 of 33 1/3 of rotation.

It uses a sandwich structure in which a wood case is sandwiched between steel boards and insulators.
The weight is increased by the steel board, and the special sandwich structure keeps the lowest resonance frequency of the cabinet sufficiently low, making it resistant to howling.
In addition, steel board is a shielding material, so it also works to prevent magnetic leakage flux from transformer and motor.

Uses a frequency-frequency illuminator that is proportional to the number of revolutions regardless of the power source frequencies.

The built-in neon lamp of the strobe illuminator is controlled by a crystal oscillator.
As a result, the system operates at precise frequencies at all times, eliminating anxiety factor such as flash flicker caused by the conventional power source frequencies, and reducing rotational speed setting errors.

It has a static balanced arm with an effective length of 237 mm.
It is a high sensitivity type that adopts anti-skating mechanism and lateral balancer, and the height of the tone arm can be adjusted.

Model Rating
Type Quartz lock player system
<Turntable portion>
Motor used 20-pole, 30-slot, brushless DC servo motor
Drive system Quartz lock servo system, direct drive system
Number of revolutions 33 1/3, 45 rpm
Speed adjustment range ± 2.5% (Quartz Lock OFF)
Start-up characteristic Within 1/2 Rotation (at 33 1/3rpm)
Wow and flutter 0.03% W. R. M. S or less
Signal-to-noise ratio 60 dB or more
Starting torque 1.2 kg / cm
Outage time 1/3 Rotation (33 1/3rpm)
1 Revolution (45 rpm)
Rotational speed deviation Within ± 0.0003%
Load characteristic 0% (Quartz Lock ON, Needle Pressure 100g)
0.02% (Quartz Off)
Initial drift 0.001%/h
Voltage characteristic 0% (± 10 V)
Temperature characteristic 0.00003%
Turntable 32 cm aluminum die-cast 1.6 kg
Tone Arm
Format Pipe Arm with Static Balance S
Effective length 237mm
Overbank 14mm
Tracking error + / - 2 degrees
Needle pressure adjustment range 0 ~ 4g (0.25g steps)
Mounting cartridge range 4.5g ~ 10.5g
Height adjustment range 7mm
Attachment mechanism Needle pressure-compatible anti-skating
Oil dump type arm elevation
<Cartridge>
Form name C-500M
Format Moving Magnet Type
Frequency characteristic 20 Hz to 20000 Hz
Output voltage 3 mv (1 kHz, 50mm/s)
Separation 20dB
Channel balance Within 1 dB
Compliance 10x10-6cm/dyne(100Hz)
Recommended load resistance 50k Ω
Replacement needle type name N-500C
Needle tip 0.5 mil round needle
Automatic 5.2g
Proper needle pressure 1.5 ~ 2g
<General>
Pwer AC100V 50Hz/60Hz
Power consumption 8W
External dimensions Width 470x Height 150x Depth 372 mm
Weight 12.5kg