Audio Database

D-105U
Commentary

A CD player with a 3-pole vacuum tube for output circuit.

A vacuum tube is used for the analog output circuit, and it is designed to take advantage of the advantages and disadvantages of each material of transistor, FET, and vacuum tube. In the D-105u, a triode 6CG7 with linear characteristics and extremely low odd order harmonics is used as the cathode follower output circuit, and low impedance output is realized.

Equipped with a preheating circuit, the vacuum tube heater can be preheated.
As a result, stable operation can be obtained in a short time.

A high-rigid lock mechanism has been adopted in pursuit of high-quality sound taking thorough measures against vibration.
In this mechanism, the optical pickup base is separated from the assembly base, and a special rubber vibration damper and coil spring are combined between them to eliminate vibration.
In addition, the low center of gravity of the center mount realizes a mechanism resistant to external vibration.

The digital filter uses an 18-bit 8 x oversampling digital filter.
In addition, channel separation and L/R phase characteristics have been improved by making the D/A conversion section independent of left and right.

Gold plated terminals are used for both ana-logout and digital out.
Two digital output systems are mounted : optical and coaxial.

Built-in editing and fade-out functions are useful for recording.
It is also equipped with a time fade-out function that allows you to set the fade-out time for up to 99 minutes in units of minutes.

Equipped with a display adjustment function, the brightness of the FL display tube can be controlled according to the brightness of the room.
It is also possible to erase completely.

Wireless remote control is included.
The volume part uses an electric volume, and the volume can be adjusted from the remote control.

Model Rating
Type CD Player
Pick-up Semiconductor laser pickup
Number of quantization bits 16-bit linear formula weight threading
Sampling frequency 44.1kHz
Frequency characteristic 5 Hz to 20 kHz ± 1 dB
Output voltage 2.0V
Dynamic range 89dB
Signal-to-noise ratio 105dB
Channel separation 86dB
Wow flutter Measurement limit value or less
Harmonic distortion factor 0.04%(1kHz)
Digital direct output 0.5Vp-p/75 Ω
Power supply voltage 100 VAC, 50Hz/60Hz
Power consumption 25W
External dimensions Width 438x Height 147x Depth 342 mm
Weight 7.5kg
Attachment Remote Controller RD-105U