YAMAHA YP-D71 Direct Drive Record Player

This record player is highly balanced by over-all pursuing the three elements of rotational accuracy, tracing precision, and suppression of unwanted microvibration.

The servo circuit uses FG servo.

The FG servo controls the rotation speed of the FG (Frequency Generator), which generates a frequency proportional to the rotation of the turntable. The YP-D71 has a structure that is less susceptible to eccentricity and detector pitch errors.

To further improve the rotational accuracy enhanced by the FG servo, a quartz-lock PLL servo is used.

This quartz lock PLL servo is a method of controlling the frequency from the FG and the reference signal generated by a crystal oscillator to eliminate phase deviation. This allows the turntable rotation accuracy to be as high as the crystal oscillator frequency accuracy, and it shows very good stability against load fluctuations, voltage fluctuations, and temperature changes.

The YP-D71 has an extremely large lock-in torque setting of 500 g-cm, which means that there is no speed deviation for a load equivalent to 40 arms of normal needle pressure. It is also designed so that the FG servo works in areas where the quartz lock is disengaged, such as at startup, and the lock indicator lights up to indicate that the quartz lock has been activated when the constant speed is reached.

In the YP-D71, the quartz servo improves for gradual load fluctuations, while the turntable's mass of inertia improves for sudden load fluctuations. In the intermediate part between these two, the YP-D71 is designed in a well-balanced manner to obtain the best sound by considering the overall characteristics of the entire rotation system, including the double servo and the bare characteristics of the mass of inertia motor.

The motor uses a newly developed coreless, slotless, DC Hall motor. This results in very little cocking and always provides strong torque. The starting torque, which is a particular problem with coreless motors, is also large at 1 kg-cm, which also improves the instantaneous response.

The turntable is made of die-cast aluminum with a diameter of 31 cm.

This turntable is precision dynamically balanced from the casting stage, and is designed with the mass moved to the outer circumference to further increase the mass of inertia. As a result, a mass of inertia of 230 kg/cm2 is achieved.

In addition, the materials, processing, and finishing of the turntable and other subtle influences on the sound are also examined using the Yamaha UR method in pursuit of the best sound quality.

The gimbal support of the tone arm is a long-span, complete 4-point pivot gimbal support, which has a double structure for vertical and horizontal movement of the rotation axis to minimize blurring of the operating points both horizontally and vertically.

The angular contact bearing that receives the pivot is supported by a rubber push to eliminate rattling and prevent vibration from the cabinet from being transmitted to the arm. This enables an initial sensitivity of 7mg.

The tone arm is an S-shape long type arm made of aluminum.

This arm has a long type arm to reduce S-shape undulation and to reduce tracking error while enabling MC cartridges with high low compliance to show their performance.

The inside of the pipe arm is filled with anti-vibration material to reduce unwanted resonance.

A zinc die-cast base is used for the arm base.

This arm base is strongly fixed at four points, and a zinc die-cast bracket supporting the gimbal support section is fixed to the protruding 27φ cylindrical base shaft with tight screws.

A 6φ NEGLEX low-impedance double cylindrical cable is used for the signal cable.

The 27φ base shaft is machined from brass and equipped with a 4mm graduated height adjuster to accommodate a variety of cartridges.

The height adjuster has a three-point locking mechanism to ensure that it can be fixed in any position.

A thread-suspension type inside force canceller is equipped.

Roller and thrust bearings are provided to reduce sliding friction of the thread, and the inside force canceller works properly at any position on the inside or outside circumference of the record.

The Yamaha UR method is applied not only to measurable basic performance such as wow flutter and signal-to-noise ratio, but also to the microscopic areas that cannot be measured. This method suppresses and controls microvibrations in all parts of the player as much as possible before they reach the cartridge needle tip, and every part of the player has been carefully examined.

The YP-D10 is equipped with an auto-stop mechanism that is a further improvement over the one used in the YP-D10.

This mechanism uses a combination of LED and CdS for non-contact detection of the feed rate when the arm is guided to the end of the arm's exit groove, which activates the solenoid and turns off the power supply at the same time.

The cabinet is made of solid particleboard.

In addition, a 1.1 kg acrylic dust cover is used to resist feedback.

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