Audio Database

The

Lo-D HT-466
48,000yen(around the 1979 time)

Description
 
The full auto player which adopted the Quartz nowait-lock uni-torque motor.

The uni-torque motor by a technology original with a Lo-D is carried in the motor.
A uni-torque motor is a motor which asked for perfect circular motion from the principle,A rotor magnet of a doughnut form by which the magnetizing was carried out, and 2 sets of star-shaped flat coils shifted 22^5 degrees are consisted of by eight poles, and the amount of torque generated from these two coils and magnets becomes fixed very always about which moment. This principle can be expressed with the easy numeric expression "sin2theta+cos2theta=1." In the uni-torque motor, further, the simple structure of a brushless and a slotless & coreless is adopted, and the endurance is also improving sharply.
The rotation stabilized by pouring the crystal control (Quartz nowait-lock PLL servo) which hardly receives a voltage fluctuation, and temporality and a temperature change on this motor has been obtained.

The full auto organization which adopted the motor only for an arm drive is carried.
It is designed so that this full auto organization may not interfere at the time of a manual operation.

At the time of a record performance, the side pressure depended on a return detection was not added, but the photoelectron type Ohtori turn detection organization without an excessive distorted occurrence is adopted.

The gimbal support scheme tone arm excellent in flattery nature is adopted as a light stylus-force performance.
Moreover, the head shell containing a glass fiber is adopted as a head shell.


Rating of a mode
Form Quartz nowait-lock DD full auto player system
<Phone motor part>
Drive system Quartz nowait-lock DD full auto
Motor Flat form non-commutator DC servo motor (uni-torque motor)
Turntable 310mmphi aluminum die casting
Constant-speed speed 33 1 / 3 or 45rpm
Speed switching Electronic control scheme
Wow and flutter 0.025%(WRMS)
SN ratio 78dB(DIN-B)
<Tone arm part>
Tone arm Stylus-force Direct-reading type static balance type pipe arm
Head shell exchange system
Arm effective length 220mm
Overhang 15mm
Tracking error 2 degrees
Stylus-force adjustable range 0-3g / 1 rotation (being a 0.1g step Direct reading)
Application cartridge weight 4g-10g
<Cartridge part>
Cartridge destination-memory type (MT-30)
Frequency characteristic 10Hz - 25kHz
Output voltage 3mV
Channel balance 1dB
Crosstalk 25dB
Stylus force 2g
The needle used DS-ST30
<Synthesis>
Supply voltage AC100V, 50Hz/60Hz
Power consumption 4W
Dimensions Width 435x height 128x depth of 375mm
Weight 5.5kg