Lo-D HT-464
¥ 39,800 (around 1979)
Commentary
A DD full auto player developed from the same design philosophy as the high-performance player of Lordi following HT 860 and HT 660.
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.
A dedicated DC motor is used to drive the arm, and equipped with a full auto mechanism that reduces the effect on the turntable.
It is designed so that this full automatic mechanism does not interfere with manual operation.
Uses a highly electronic auto return detection mechanism that can detect returns without contact using a light source (LED), shutter, and photo sensor (Cds).
Uses a gimbal support tone arm.
The head shell uses a head shell containing glass fiber.
Model Rating
Type | DD full auto-player system |
Phono Motor Section | |
Drive system | DD Full Auto |
Motor | Flat type commutator DC servo motor (unitorque motor) |
Turntable | 310 mm φ Aluminum Die-cast |
Constant speed | 33 1/3, 45 rpm |
Speed change | Electronic control system |
Speed adjustment range | 33 1/3rpm : + / - 3% 45 rpm : + / - 4% (Common adjustment for both speeds) |
Wow and flutter | 0.03%(WRMS) |
Signal-to-noise ratio | 77dB(DIN-B) |
Tone Arm Section | |
Tone arm | Needle pressure direct reading static balance type pipe arm Head shell replacement system |
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 |
Cartridge Section | |
Cartridge | MM Type (MT-24) |
Frequency characteristic | 10 Hz to 25 kHz |
Output voltage | 3 mv (1 kHz, 50cm/s horizontal) |
Channel balance | 1dB |
Crosstalk | 25dB |
Needle pressure | 2g |
Needle to be used | 0.5 mil Diamond Needle (DS-ST24) |
<General> | |
Power supply voltage | 100 VAC, 50Hz/60Hz |
Power consumption | 5.5W |
External dimensions | Width 435x Height 128x Depth 375 mm |
Weight | 5.5kg |