A record player that is an upgraded model of the DP-3700.
The DP-3700F has improved anti-vibration performance by improving the cabinet and arm base.
DP-3000 is adopted as a turntable part.
The DP-3000 adopts a direct drive system as a drive system, and DENON's original high-precision magnetic recording and reproduction system is adopted for rotation speed detection.
In the magnetic recording / playback method, the voltage applied to the motor is controlled by comparing the voltage obtained from the actual rotation of the turntable with the reference voltage. The voltage obtained from the turntable is obtained by detecting a pulse magnetically recorded on the inner circumference of the turntable with a magnetic head with a magnetic head and converting it into a voltage corresponding to the frequency. There are 1000 of these pulses, and the pulse interval is recorded with an error accuracy of 1/10000. This pulse enables extremely accurate speed detection and extremely fast and sufficient servo control, and suppresses wow and flutter to 0.03% or less. In addition, stable rotation is maintained even if load conditions such as stylus pressure change.
The servo circuit has a structure that provides sufficient temperature compensation and incorporates a regulated DC power supply. This prevents the rotation speed from being affected by fluctuations in power frequency and voltage, and temperature changes.
The solid rotor type AC servomotor is adopted as a drive motor.
This motor has smoother and less vibrating rotation characteristics than other synchronous motors and DC motors, but it has almost no rumble by being driven by alternating current with more beautifully shaped waveforms.
The weight of the turntable is reduced by adopting an accurate and quick response speed detection system and a stable servo system. As a result, the starting characteristics are reduced to 1/2 rotation or less, the bearing load on the motor is light, and stable performance is maintained for a long period of time.
The speed switching by an electric switch is adopted.
It is possible to fine-tune the speed, and it is possible to adjust ± 3% of the specified speed.
The DA-305 which is a model conforming to the broadcasting station specifications is adopted as a tone arm part.
DA-305 is a laterally balanced S-shape designed so that it can be used with confidence even with a light stylus pressure cartridge. The stylus pressure adjustment is a micrometer type direct reading type with 0 to 1 g per rotation, and the cartridge can be used in a wide range from its own weight of 4 g to 15 g.
In order to maintain high sensitivity and high reliability, the rotary bearing has the same consideration as the arm for broadcasting stations.
The horizontal axis of rotation has two premium miniature bearings protected by a double housing. In addition, the vertical rotation part is a combination of an angular bearing that is protected by a special elastic material and has little friction change and a pivot that has been hardened and precision polished to be stable against external vibrations and shocks, and at the same time minimize the resonance of the arm itself. I am.
The special low-capacity output cord is used as a cord, and the MM type cartridge of a high output impedance and the 4-channel record play are also supported.
Furthermore, the connector is gold-plated to eliminate problems such as poor contact.
The laminated plywood of 70mm thickness is used for the cabinet, the mass is increased and the resonance of the cabinet itself is suppressed.
Furthermore, the vibration of the cabinet is absorbed to the tone arm by using the mechanical filter of the viscoelastic material between the arm base and the cabinet.
The height-adjustable insulator is adopted as a leg part, and the vibration from the floor is absorbed.
Model rating
Type Player system
<Phonomotor section (DP-3000)>
Moving way Direct drive
motor Solid rotor type AC torque motor
Speed control method Servo method by frequency detection
Rotation speed 33 1 / 3rpm 、 45rpm
Speed switching mechanism Electrical switching
Rotation speed adjustment range ± 3% (relative to specified speed)
Wow and flutter 0.03% wrms or less (according to test record)
S/N ratio Above 60dB
Starting characteristics 1/2 rotation (1.8 seconds) or less (33 1/3 rpm)
Turntable 30cm aluminum die casting, own weight 1.1kg
Moment of inertia 160kg・cm2
<Tone arm (excluding DA-305 and arm base)>
form Static balance type
Effective length 244mm
Overhang 14mm
Offset angle 20.5゜
Traking error Within ± 2 °
Needle pressure adjustment range 0-3g (1 scale 0.2g)
Compatible cartridge weight range 4g ～ 15g
Head shell own weight 8.5g
Arm height adjustment range 40～55mm
Head connector EIA standard 4P connector
Arm lifter Oil dump type
Arm base With mechanical filter
<Comprehensive>
cabinet 70mm plywood
AC100V、50Hz/60Hz
External dimensions Width 530 x Height 180 x Depth 440 mm
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