Lo-D HT-660

Commentary

A full auto player system with quartz lock and electronic return.

The motor is equipped with a unitorque motor based on Lordi's proprietary technology.
The Unitorque Motor is a motor which obtained perfect circular motion from the principle. It consists of a doughnut-shaped rotor magnet magnetized with 8 poles and two sets of star-shaped flat coils offset by 22 ^ 5 degrees. The torque generated by these two coils and magnets is constant at any moment. This principle is called sin²Θ + cos²Θ = 1 ". The Uni-Torque Motor also adopts a simple structure that is brushless, slotless and coreless, and has significantly improved durability.
In the HT-660, this uni-torque motor is equipped with crystal control (quartz lock PLL servo) which is hardly affected by voltage fluctuation, aging and temperature change, and achieves high precision rotation.
The start-up a constant speed at 1/2 revolution.

Equipped with a built-in electronic brake system that enables quick record exchange and speed switching, reducing the stopping time from approximately 25 seconds for an unequipped DD to approximately 3 seconds.

By adopting a two motor system in which the turntable rotation motor and the arm drive motor are independent, mutual interference is eliminated and basic performance is not impaired.

Equipped with an opto-electronic auto-return detection mechanism.
Unlike conventional mechanical return detection methods, a light source (LED), a shutter, and a photo sensor (Cds) are combined to enable a return without contact.

Equipped with an arm height adjustment mechanism, it is possible to accurately adjust the level of the arm and correct vertical tracking error.

A turntable with a diameter of 330 mm is used.

Uses a front operation soft push switch for easy operation with the dust cover closed.

Model Rating

Type	Quartz Lock DD Full Auto Player System
Phono Motor Section
Drive system	Quartz Lock DD Full Auto
Motor	Flat type commutator DC servo motor (unitorque motor)
Turntable	330 mm φ Aluminum Die-cast
Constant speed	33 1/3, 45 rpm
Wow and flutter	0.025%(WRMS)
Signal-to-noise ratio	75dB(DIN-B)
Load characteristic	0%
Rotational speed deviation	0.003% or less
Tone Arm Section
Tone arm	Needle pressure direct reading static balance type pipe arm
Effective arm length	220mm
Overhang	15mm
Tracking error	2 ゜
Needle pressure adjustment range	0 ~ 3g/1 Rotation (Direct Reading in 0.1g Steps)
Applicable Cartridge Weight	4g ~ 10g
Arm Height Adjustment Range	3mm
Cartridge Section
Cartridge	VM Type (VFS-261)
Frequency characteristic	20 Hz to 20 kHz
Output voltage	3 mv (1 kHz, 50mm/s)
Channel balance	1dB
Needle pressure	2g
Needle to be used	0.7 mil Diamond Needle (DS-ST26)
<Cabinet portion>
Cabinet	Aluminum Die-cast
Insulator	Air suspension
<General>
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	5.5W
External dimensions	Width 454x Height 140x Depth 391 mm
Weight	9kg