Description
Product description An integrated amplifier that has been improved as an EXTRA version of the AU-D907F. Sansuis original super feed forward system is adopted as the power amplifier section. In order to further improve the quality of this circuit, the AU-D907F EXTRA uses a MOS-FET for the error correction amplifier. By using a MOS-FET circuit that has a switching speed more than five times that of a bipolar transistor and has excellent broadband characteristics and temperature stability, the stability of the distortion canceling signal produced by the error correction amplifier has been improved. Moreover, the pre-driver stage is equipped with a diamond differential circuit that suppresses TIM distortion to zero. Equipped with a linear step MC transformer to support MC cartridges. This transformer reflects Sansuis amplifier technology and transformer technology, and uses a permalloy five-layer shield structure, a 78% 0.1m/mL type permalloy core, and has a special balanced winding structure for the thick windings. Microphonic shock noise measures are also taken. This results in a transformer with good dynamic characteristics, wide range, and high S/N ratio. In addition, it is possible to switch between high impedance and low impedance to accommodate all MC cartridges. The power supply section employs a large balanced winding transformer using a CI core with excellent regulation. In addition, a newly developed original ? capacitor with high speed and ultra-low magnification is used for the capacitor. 12,000?Fx4 creates the low range sound, and a 4,700?Fx4 ? capacitor enhances the midrange and above. Masu. Furthermore, by adopting a first recovery diode, high-speed reproduction of sound is achieved. In addition, by using a total of 5 power supply structures, left and right sides are independent and interference between stages is eliminated. The equalizer circuit uses a diamond differential circuit DC amplifier configuration. The first stage has good pair characteristics, employs a differential circuit using low noise, high GM dual FETs, and constitutes a cascode bootstrap circuit that is not affected by input impedance. In addition, the 2nd and 3rd stages consist of a diamond differential circuit with excellent drive ability and a current differential push-pull. And, the output stage has obtained enough current margin with the SEPP circuit by Darlington connection, and the low output impedance and low impedance NF circuit have enough dynamic range even when the load impedance changes, and the SN ratio has also improved. Moreover, in order to eliminate an output capacitor while stabilizing a DC domain, DC servo is adopted. We use materials and construction to eliminate magnetic distortion. The AU-D907F EXTRA uses copper plating on the chassis to make it non-magnetic, eliminating magnetostriction from the amplifier framework. In addition, the construction has a heat loop in the center, freeing it from the effects of heat generation and allowing it to concentrate on avoiding magnetic flux. Furthermore, we have taken thorough measures against magnetic distortion by adopting NM (non-magnetic) elements. Equipped with a 16Hz subsonic filter and a 20kHz supersonic filter. The tone control is equipped with a turnover frequency switching function. Equipped with a recording selector that allows two independent sources and a dual-circuit tape monitor/copy function. Adopts real wood side panels. A gold-plated phono input terminal is adopted. ?Main specifications Model Integrated DC amplifier Effective output 130W+130W (8?, 10Hz-20kHz, THD 0.003%) 130W+130W (8?, 1kHz, THD 0.002%) Total harmonic distortion rate (10Hz to 20kHz, at effective output) 0.003% or less (8?) Cross-modulation distortion (60Hz:7kHz=4:1, SMPTE) 0.003% or less (8?) Output bandwidth (IHF, both channel operation, THD 0.02%) 5Hz to 80kHz (8?) Damping factor (new IHF, 20Hz to 20kHz) 100 (8?) Frequency characteristics (1W) DC ~ 300kHz +0 -3dB Envelope distortion Below measurement limit TIM distortion (Sawtooth method) below measurement limit Slew rate ±250V/?sec(8?) Rise time 0.5?sec Input sensitivity/input impedance (1kHz) Phono1, 2 MM:2.5mV/47k? Phono1, 2 MC(Low/High):70?V(3.2?)/250?V(40?) Tuner, Aux, Tape play1, 2:250mV/27k? Phono maximum allowable input (1kHz, THD 0.01%) MM:200mV MC:25mV(low), transformer method Output level/impedance (1kHz) Tape rec(PIN):250mV(47k?)/600? Total harmonic distortion rate (20Hz to 20kHz, at 5V output) Phono1, 2 MM: 0.005% or less Phono1, 2 MC: Transformer method RIAA deviation (MM, Rec out) 20Hz~300kHz ±0.2dB SN ratio (A network, short circuit) Phono1, 2 MM: 90dB or more Phono1, 2 MC: 75dB or more (Low) Tuner, Aux, Tape play1, 2: 110dB or more Phono input equivalent noise (A network, short circuit) Phono1, 2 MM:-142dBV Phono1, 2 MC: -155dBV Channel separation (1kHz) Phono1, 2 MM: 60dB or more Phono1, 2 MC: 50dB or more Tuner, Aux, Tape play: 80dB or more Tone control Bass:±10dB(50Hz) Treble:±10dB(10kHz) Tone selector Bass: 150Hz, 300Hz Treble:3kHz, 6kHz Filter Low: 16Hz (-3dB, 6dB/oct) High: 20kHz (-3dB, 6dB/oct) Audio muting -20dB Rated power consumption (Electrical Appliance and Material Control Law) 320W External dimensions Width 460x Height 160x Depth 444mm Weight 17.7kg ?The condition of the product is almost unused. There are no noticeable scratches on the front panel. There are no noticeable scratches on the cabinet, it is shiny and overall in very good condition. The back panel is also in excellent condition, with no rust that is common with this model. In terms of operation, we confirmed the sound output from each output. The sound is output evenly from left and right, and there is no distortion in the sound quality. It produces a delicate and soft sound that is typical of the original Sansui top model. Maintenance performed by audio specialists includes replacing deteriorated capacitors, disassembling and cleaning the contacts of volume switches, cleaning with alcohol, and inspecting circuits using an oscilloscope and tester. For remote delivery areas, additional fees will be charged. Import duties,taxes and charges are not included in the item price or shipping charges. These charges are the buyers responsibility. These charges are normally collected by the delivering freight(shipping) company or when you pick the item up. -do not confuse them for additional shipping charges. We do not mark merchandise values below value or mark items as gifts. -US and International government regulations prohibit such behavior.
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