Aurex SR-410/SR-410E
¥ 74,000 (around 1975)
Commentary
A record player with photoelectric servos.
The drive mechanism uses a direct drive system.
A photoelectric servo system is used in the servo circuit of this mechanism. This speed control system is equipped with a striped slit plate that rotates simultaneously with the turntable. This slit plate is sandwiched between a light projecting part and a light receiving part. The photosensitive element CDs in the light receiving part detects the interruption of light caused by the rotation of the slit and detects a pulse. This pulse is amplified, the waveform is adjusted by a multivibrator, and integrated into a DC voltage. This voltage is compared with a reference voltage, and the difference voltage is amplified and sent to a switching circuit to control the driving voltage of the motor.
As a characteristic of light, its response speed is fast and accurate, thus realizing an excellent speed control method.
The drive motor uses an eddy current AC servo motor with less uneven torque.
It is equipped with a mirror type strobe and illuminator using a reflector.
Uses MM type cartridge C-210M.
Equipped with a push-button type speed switching function.
In addition, it is equipped with a knob for fine adjustment of each speed.
Equipped with 2 cartridge stands and small plates.
Equipped with a level that can confirm the horizontal adjustment of the player system.
In addition, in order to reduce vibration transmitted from floors and racks, it is equipped with an insulator whose height can be adjusted.
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Model Rating
| Type | Record player |
| <Turntable portion> | |
| Motor | AC servo motor |
| Drive system | Direct drive system |
| Number of revolutions | 33 1/3, 45 rpm |
| Wow flutter | 0.03%(WRMS) |
| Signal-to-noise ratio | 60dB |
| Turntable | 30 cm Aluminum Die-cast, 1.2 kg |
| Inertial mass | 170kg-cm2 |
| Tone Arm Section | |
| Type | Static Balance S-shaped |
| Effective length | 237mm |
| Tracking error | + 1.5 °, -0.5 ° |
| Overhang | 15mm |
| Needle pressure variable range | 0 ~ 4g |
| Cartridge Section | |
| Type | MM Type (C-210M) |
| Frequency characteristic | 20 Hz to 20 kHz |
| Output voltage | 3 mv (1 kHz, 50mm/s) |
| Separation | 25dB(1kHz) |
| Channel balance | 1dB(1kHz) |
| Compliance | 10x10-6cm/dyne |
| Recommended load resistance | 50k Ω |
| Needle tip | 0.5mil |
| Needle pressure | 1.5g |
| Exchange needle | N-210C(¥2,000) |
| Dead weight | 5.3g |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 14W |
| External dimensions | Width 550x Height 190x Depth 414 mm |
| Weight | 12kg |