Pioneer PD-UK5

Commentary

John Bamford, who wrote for Hi-Fi Answer (now Audio File) and edited for Hi-Fi Choice magazine, decided the sound of the UK series CD player.

It is equipped with legato link conversion for more natural sound quality.
This circuit connects the data of a music signal recorded on a disk with a smooth function curve suitable for reproducing natural sounds and the frequency components of musical instruments. This circuit makes it possible to reproduce a sound close to the original music signal with little ringing (waveform disturbance). At the same time, it makes it possible to reproduce a sound of 20 kHz or higher according to the 1/f attenuation characteristics, resulting in smoother and more natural reproduction sound.

In order to eliminate unnecessary vibration of the disk, a turntable system is adopted as the mechanism.
By supporting the disk on the entire surface of the turntable, it is resistant to external vibration and warpage, and suppresses unnecessary vibration of the disk. In addition, by the large moment of inertia, it is resistant to load fluctuation, and realizes stable rotational performance, and reduces deterioration of servo characteristics and jitters.

The D/A converter employs a high-speed pulse flow D/A converter independently developed by Pioneer on the left and right sides to reduce interference between channels.
This D/A converter takes advantage of the 1-bit system, which does not in principle cause 0 cross distortion or glitch noise. In order to eliminate the influence of requantization noise on sound quality, the D/A converter performs noise shaping at an oversampling frequency as high as 384 fs. This enables detailed calculation and greatly reduces the noise in the audible band caused by requantization. In addition, the D/A converter uses a low-order noise shaper to minimize the influence of out-of-band noise.
The effect of jitter is also reduced by operating the master clock at a low clock frequency of 16.93 MHz.

In pursuit of simplicity and high quality, it uses direct construction.
The pickup mechanism is placed in the center of the chassis in a center tray design. In addition, the main circuits such as digital / servo circuits, audio circuits and power supply are laid out along the signal flow, and the pickup is connected to the output terminal with the shortest distance.
This prevents interference between circuits and reduces noise.

The power supply is equipped with two separate power transformers for the digital / servo circuit and for the audio circuit to prevent interference between the digital and audio circuits.
The power supply circuit employs a 3-part 7-regulator, which independently rectifies three parts, digital / servo, D/A converter and audio, eliminating the influence between circuits.

Honeycomb chassis is used for the chassis to suppress unnecessary vibration.
We have also adopted a honeycomb structure insulator to absorb vibrations from the outside.

It is equipped with computer program edit, time fade edit, auto program edit, peak search and memory hold functions.

Equipped with a display off switch, it is possible to eliminate scanning noise when the display is on.

Equipped with a digital / analog changeover switch.

Equipped with CD-DECK synchro terminal.

Model Rating

Type	CD Player
Pick-up	Three beam semiconductor laser system
Frequency characteristic	2 Hz to 20 kHz
Signal-to-noise ratio (EIAJ)	115 dB or more
Dynamic Range (EIAJ)	99 dB or more
Channel Separation (EIAJ)	110 dB or more
Wow & flutter (EIAJ)	Measurement limit (± 0.001% W. PEAK) or less
Harmonic distortion factor (EIAJ)	Not more than 0.0017%
Output voltage	2.0Vrms
Number of channels	2 channels (stereo)
Digital output	Optical output : -15dBm ~ -20dBm (wavelength 660 nm)
Pwer	100 VAC, 50Hz/60Hz
Power consumption	11W
External dimensions	Width 420x Height 131x Depth 286 mm
Weight	5.0kg
Attachment	Wireless Remote Control