Audio Database

SU-V6X
Commentary

Computer drive An integrated DC amplifier equipped with a new power linear circuit in a new class A amplifier.

It is equipped with a power linear circuit unique to Technics.
This is a development of linear feedback circuit technology. This effect is brought to the output stage of the amplifier, and linearity is dramatically improved, and distortion caused by low impedance load of the speaker at every moment is suppressed.

Equipped with computer drive new class A system.
In this computer drive, a microcomputer was introduced for the first time in the world for the bias control of the amplifier signal system. Based on information from the signal sensor, the instantaneous temperature operating state of the output transistor in response to changes in the music signal is calculated, and the ICQ (idling current) is always controlled to the optimum value.
This ensures that no transient crossover distortion due to excess or deficiency of ICQ occurs during playback of any music signal.

After the power is turned on, the circuit can be checked by the display on the front panel until stable operation is achieved.

By incorporating a linear feedback circuit and further developing the NFB theory and forming an independent feedback circuit that enables infinite amplification in the NFB loop, we have achieved theoretical distortion = 0, pure gain without the influence of elements and power supply, and speaker drive without the influence of back electromotive force and wire rod. As a result, we have achieved distortion reduction effects of almost infinite at the lower limit of the range of audibility and 40 dB at the upper limit of 20 kHz.

It is equipped with a synchronous bias circuit, and by adopting a synchronous bias circuit that supplies a constant bias in synchronization with the pause cycle to the output transistor that normally pauses alternately in class A and class AB amplifiers, the output stage is always kept in the active state and switching distortion caused by the pause is eliminated.
In addition, the signal path and bias current path are made independent to minimize crossover distortion.

A powerful power supply circuit consists of a newly designed power transformer with low loss and large capacity and a low-ESR (equivalent series resistance) smoothing electrolytic capacitor with low loss.

The phono equalizer uses an ultra-low noise FET to achieve a high SN ratio.

The tone control circuit uses the main NF type (bass) and NF-CR type (treble) to achieve a high SN ratio and low distortion.

The back panel has terminals for external devices that are convenient for connecting graphic equalizers, etc.

Model Rating
Type Integrated DC amplifier
<Overall characteristics of Tuner, Aux → SP out>
Effective output (20 Hz to 20 kHz) 120W + 120W (6 ohm, 0.005%)
Total harmonic distortion factor 0.002% (Rated Output -3dB, 20 hz to 20 khz)
TIM Unmeasurable
Output Bandwidth (THD 0.02%) 5 Hz to 100 kHz
Frequency characteristic 20 Hz ~ 20 kHz + 0 -0.1 dB
0.5 Hz ~ 170 kHz + 0 -3dB
SN ratio (IHF-A, straight DC) 104dB
Residual Noise (straight DC) 0.5mV
Damping factor (8 Ω) 80
Load impedance Main or remote : 4 Ω ~ 16 Ω
Main and remote : 8 Ω ~ 16 Ω
<Other characteristics>
Input Sensitivity / Impedance Phono MM : 2.5mV/47k Ω
Phono MC : 170 μ V/220 Ω
Tuner, Aux, Tape : 150mV/18k Ω
Phono SN ratio MM : 88 dB (2.5 mV input)
MC : 72 dB (250 μ V Input)
Phono frequency characteristics 20 Hz to 20 kHz, RIAA ± 0.5 dB
Shelving tone Bass : ± 10 dB (50 Hz)
Treble : ± 10 dB (20 kHz)
Filter Subsonic : 30 Hz, -6dB/oct.
Loudness control + 9 dB (50 Hz, Volume -30dB)
<General>
Pwer 100 VAC, 50Hz/60Hz
Power consumption 193W
External dimensions Width 430x Height 141.6x Depth 380 mm
Weight 10.7kg