Audio Database

The

DIATONE LT-5
69,800yen(1981 release)

Description
 
It is the full auto player which adopted the linear tracking system.

The arm has adopted the linear tracking system which carries out straight line movement of the record board top.
By a linear tracking system, since the tangential adjusting of a sound track is traced correctly, a tracking error and higher-harmonic-wave distortion can be decreased. Moreover, since there is no generating of an inside force, symmetrical contact of the needle point is attained and, on the whole, improvement in tracking capability can be aimed at.

The stainless steel wire is adopted as the drive of the move base which fixes a tone arm. This wire united a thin line 0.05mm in diameter from 49, is performing nylon coating and has realized the outstanding durability and pliability.
Moreover, the potential difference of two photo-diode outputs of arm back has detected the tracking error.

The record size automatic detection mechanism in which the optical system was applied is adopted as detection of record size.
By this system, light is glared from the slanting upper part with a reflector, light is led to a sensor from the reflector for turntable sheets, and the output of a sensor is changed by glaring / covering light according to the size of a record. This output is sent to a logic circuit and record size is detected automatically. Based on the size of the record detected here, a needle descent position and a rotating speed are determined automatically.

The quick response mechanism is carried, and if an arm directs the next operation with a button also in /descent during a rise by auto operation, it will shift to the operation immediately.

The feather touch type which uses a microswitch is adopted as a manual operation button.

EC (electronic control) circuit is adopted as a full auto mechanism. In order to control complicated operation correctly, LSI of one chip is adopted as this circuit.

The needle point protection function is carried, and when there is no record in a turntable, a tone arm does not descend.

The muting mechanism which cuts a noise is adopted.

The instability of the pipe part was abolished by extending the span of the pivot of a tone arm part, and perpendicularity and a horizontal direction have realized high sensitivity.

Stainless steel is adopted as the quality of the material of a tone arm.
Moreover, OFCu (non-oxygen conducting wire) which gave special covering is used for the conducting wire in an arm, and head shell conducting wire, and the total direct-current resistance from head shell to a pin plug is suppressed.

The direct-drive system by the Quartz PLL system which controls the number of rotations of a motor by the standard signal of a crystal oscillator is adopted as the drive of a turntable. Moreover, stable rotation is realized by adopting the high torque DC servo motor of the bearing mechanism finished precisely.

Wooden cabinets are adopted as a cabinet.


Rating of a mode
Form Linear tracking electronic-control full auto player
<Turntable part>
Drive system Direct drive
Motor 4 phase 12 pole Quartz PLL and a DC servo motor
Turntable The product made from 304mm aluminum alloy die casting, 1.3kg
Number of rotations 33 1 / 3 or 45rpm
Wow and flutter 0.025% (WRMS, JIS)
Signal to noise ratio 78dB(DIN-B)
<Tone arm part>
Form Static balance, a universal straight pipe
Full length 220mm
Active length 171mm
Tracking error angle ±0.1 degree or less
Needle pressure adjustment 0-3g Direct-reading type (0.1g step)
Head shell Glass fiber ON reinforced plastic
Cartridge attachment weight range 10g-18g
<Synthesis>
Power source AC100V, 50Hz/60Hz
Power consumption 14W
Dimensions Width 424x height 142x depth of 417mm
Weight 10kg
Attachment Dust cover
Overhang gage
45 rotation adapter
Hexagon head wrench