Amplificator Technics SU V 90 D

Amplificator Technics SU V 90 D: MADE in Japan, 765W consum, 7 intrari, 4 iesiri, 4-16 ohmi, optical/coaxial, phono selector, reglaje bass inalte, balance, tone control, muting, loudness, power direct, amplif VC 4, class AA, refacut ornamentul de la butonul de volum, vezi foto. 

Pre-main amplifier equipped with D/A converter.

The D/A conversion section uses a 4-DAC 18-bit conversion system.
In the 4DAC 18-bit conversion system, two D/A converters are installed in each L/R channel to process the + and - components of the input signal independently. A total of four D/A converters are used in the 4DAC conversion system. In this circuit, first of all, a newly developed 4 DAC processor LSI distinguishes between + and - signals from the input digital signal, and high-speed processing is performed by switching two D/A converters. This realizes D/A conversion without 0 cross distortion in principle.
In addition, the D/A converter achieves 18-bit operation at an average music level of -12dB or less by using a 4 DAC processor LSI. This, combined with the use of a 4 x oversampling 18-bit digital filter, provides more faithful analog waveform reproduction capability.

Three sampling frequencies, 32 kHz, 44.1 kHz and 48 kHz, are available for use with CD players, DAT and BS tuners.

The digital input has two systems, optical and coaxial.

The power amplifier section is equipped with a VC-4 amplifier (Voltage Current 4 amplifier system) classAA amplifier.
In this circuit, voltage control and current drive are handled by separate amplifiers for each L/R channel, so that the voltage control amplifier is released from current supply. Voltage control is achieved with high fidelity to the input signal, and the current drive amplifier has sufficient current supply capability for speaker drive.