Amplificator Technics SU-A 707
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Amplificator Technics SU-A 707
Data anuntului: 27 Ianuarie 2013 18:27:00
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Stare produs: Folosit
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Amplificator Technics SU-A707
-Mos class AA
-condensatori Ta-KeH II
-made in japan
Integrated amplifier which attained low-noise-ization by carrying VGCA
The original low-noise amplifier VGCA (Variable Gain Control Amplifier) is adopted as an amplifying circuit.
The amplifier stream composition which extracts a signal and is amplified after that in the conventional input volume in this circuitry is stopped, and only a part to be amplified gives gain to amplifier by changing the gain of an amplifier part itself, and it is made to operate as buffer amplifier in the gain not more than it. Moreover, the sound-volume control is performed in the volume which interlocks after amplifier. This has realized the play in the usually used volume location of a clearer sound.
The MOS ClassAA circuitry which adopted based on the ClassAA circuitry and adopted MOS FET as the amplification element is carried.
In the ClassAA circuitry, individual amplifier is performing the voltage amplification and the current supply source, and high power and perfect Class-A voltage control are realized.
In the MOS ClassAA circuitry carried in SU-A808, an input impedance is very high in the last stage which controls the output-terminal of pure Class-A voltage control amplifier, and has adopted the amplification element MOS FET excellent in the linearity as it. Moreover, there are few losses, the bipolar transistor which is acknowledged in the Oide power operation is adopted as the final stage of current-supply-source amplifier, and the correspondence to a digital format of a DVD-Audio etc. is aimed at to it according to the class AA bridge effect of demonstrating the benefit of each amplifier to the maximum extent.
Magnetic flux is uniform, R core power transformer with circular core cross-section form is adopted as a power transformer, in order that there may be no joint in a core, there is very little leakage magnetic flux, and the noise occurrence by a magnetic field is suppressed.
The capacitor using the separator which blended the bamboo fiber is adopted as an electrolytic capacitor, and the tone quality which stopped an unnecessary incidental sound is realized.
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