DIATONE LT-5
¥ 69,800 (released in 1981)
Commentary
A full-auto player with linear tracking system.
It uses a linear tracking system in which the arm moves linearly on the record board.
The linear tracking tracking method, tracking error and harmonic distortion can be reduced because the tangential direction of the sound groove is accurately traced. In addition, since there is no inside force, the needle tip can be made symmetrical contact, and overall tracking capability can be improved.
A stainless steel wire is used for the drive of the moving base that fixes the tone arm. This wire realizes excellent durability and flexibility by combining 49 fine wires of 0.05 mm diameter and applying nylon coating.
Tracking error is detected by the potential difference between the two photodiode outputs at the rear of the arm.
To detect the record size, an optical system is applied to the automatic record size detection mechanism.
In this system, the reflector emits light from an obliquely upward direction, guides the light from the turntable seat reflector to the sensor, and changes the output of the sensor by irradiating or shielding the light according to the size of the record. This output is sent to the logic circuit, and the record size is automatically detected. Based on the detected record size, the needle down position and rotation speed are automatically determined.
Equipped with a quick response mechanism, even when the arm is ascending or descending by automatic operation, if you indicate the next operation with the button, it will move immediately to that operation.
Feather touch type using micro switch is adopted for the operation button.
The full-auto mechanism uses an EC (electronic control) circuit, which uses a single-chip LSI to accurately control complex operations.
Equipped with a needle tip protection function, the tone arm does not lower when there is no record on the turntable.
Uses a muting mechanism to cut noise.
By expanding the span of the pivot of the tone arm part, looseness of the pipe part is eliminated, and high sensitivity is realized in both vertical and horizontal directions.
Stainless steel is used for the material of the tone arm to reduce the deflection of the pipe part.
In addition, specially coated OFCu (oxygen-free conductor) is used for the conductor inside the arm and the conductor in the head shell to reduce the total DC resistance from the head shell to the pin plug.
The turntable is driven by a direct drive system using a quartz PLL system, which controls the number of revolutions of the motor according to the reference signal of the crystal oscillator, and by using a high-torque DC servo motor with a precisely finished bearing mechanism, stable rotation is achieved.
Wooden cabinet is used for the cabinet.
Model Rating
| Type | Linear tracking electronically controlled full auto player |
| <Turntable portion> | |
| Drive system | Direct drive |
| Motor | 4-Phase 12-Pole Quartz PLL / DC Servo Motor |
| Turntable | 304 mm Aluminum Alloy Die-cast, 1.3 kg |
| Number of revolutions | 33 1/3, 45 rpm |
| Wow and flutter | 0.025% (WRMS, JIS) |
| Signal-to-noise ratio | 78dB(DIN-B) |
| Tone Arm Section | |
| Format | Static Balance, Universal Straight Pipe |
| Total Length | 220mm |
| Effective length | 171mm |
| Tracking error angle | ± 0.1 degrees or less |
| Needle pressure adjustment | 0 ~ 3g Direct Reading Type (0.1g Step) |
| Head shell | Glass fiber reinforced plastic |
| Cartridge mounting weight range | 10g ~ 18g |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 14W |
| External dimensions | Width 424x Height 142x Depth 417 mm |
| Weight | 10kg |
| Attachment | Dust cover Overhang gauge 45 Rotation Adapter Hex Wrench |