Description
Item Description Sansui AU-X1 integrated amplifier in full working order, measures within specifications has been rebiased and load tests fine. Comes with a comprehensive service including new preset controls, replacement of known prone to fail components, and all small electrolytic capacitors. This is late production model that has all the the factory performance upgrades. Condition is fair to good, some scratches to the front panel, see photos to confirm. This is an import model some comes with a UK power adapter, no other accessories or cables are included in the sale. Dont miss out on an opportunity to own this highly regarded rare amplifier. Specifications: An amp designed to pursue as much as possible the ideal that an amp should be a single conductor with a degree of amplification that faithfully conveys the music signal.About half of the space is for the power supply. The form of independent 8 power-source stream composition is adopted to whole page right-and-left independence, a power stage, a pre-drive stage, a flat amplifier/equalizer, and MC head amplifier.A 600VA high-capacity toroidal transformer and an 80VI/EI transformer are used. 8 x 10,000?F custom high-capacity electrolytic capacitors developed exclusively for audio are connected in parallel, and a 1.2mm thick copper plate is used in combination with the grounding circuit. For this reason, even if the speaker impedance fluctuates with frequency, the powerful power supply section provides stable operation.Equipped with a diamond differential circuit. Furthermore, the newly developed linear high-speed output element NM-LAPT (Non Magnetic-Linear Amp. Power Transistor) is adopted. As a result, we succeeded in bringing TIM distortion and envelope distortion, which are dynamic distortions that hinder sound quality, to as close to 0 as possible.From large die-cast heat sinkers to high-efficiency triple-braided speaker cord wiring, we carefully check the characteristics of each individual part and select them through interviews.A power amplifier operation switch on the front panel allows separation of pre and power.The power supply to the power stage uses a large toroidal transformer (power supply capacity 600VA) with good regulation with 2 windings and 2 rectifier circuits with independent left and right channels. In addition, custom large-capacity electrolytic capacitors of 10,000 ?F x 8 developed exclusively for audio are connected in parallel, and a 1.2 mm thick copper plate is used in combination with the ground circuit.Moreover, the left-right channel independent 2 power-source system by the large-sized EI transformer (power-source capacity 80VA) is used for the pre-drive stage, and a diamond differential circuit is strongly driven.In addition, the equalizer amplifier section and flat amplifier section are supplied from left and right independent constant voltage circuits, and the MC head amplifier section is supplied from left and right independent low voltage circuits with separate windings.Newly developed NM-LAPT with high speed, excellent linearity, high breaking strength and high cutoff frequency (ft100MHz) is used for the power transistor with triple push-pull connection and used at the operating point with excellent linearity.The head amplifier section has a DC amplifier configuration that further advances symmetrical push-pull input/output using newly developed low-noise high gm P-ch and N-ch FETs. The first stage is a direct couple system with low noise, high gm P-ch and N-ch FETs connected in parallel to achieve ideal input impedance and a high S/N ratio with push-pull input.In addition, the second stage is an MC amplifier circuit with excellent open loop characteristics and good linearity due to a push-pull drive two-stage direct connection circuit using a combination of NPN-PNP transistors.Furthermore, extremely high stable operation has been obtained by right-and-left independence and power supply only for MC.The equalizer amplifier section has a DC amplifier configuration equipped with a diamond differential circuit using a direct couple method. The first stage has good pair characteristics, adopts a differential input circuit that uses low noise, high gm, and dual FETs, and configures a cascode bootstrap circuit that is not affected by input impedance.Moreover, by the high-performance constant-current circuit (PAT. PEND) which consisted of the two-step hardwired-connection circuit by the NPN-PNP transistor combination, CMRR (common-mode component suppression cost) in a summing point was taken high, and the outstanding dynamic characteristic has been acquired. The second and third stages are a diamond differential circuit with excellent drive capability + current differential push-pull, the output stage is a SEPP circuit with Darlington connection and has a sufficient current margin, and the low output impedance and low impedance NF circuit design provide a sufficient dynamic range even against changes in load impedance, and further improve the S/N ratio.The flat amplifier adopts a push-pull drive DC amplifier configuration with a differential input circuit using a newly developed 1Tip (4- element enclosed) FET in the first stage, and achieves excellent operation by independent power supply for left and right.The speaker wiring cord from LAPT adopts an ultra-low DC resistance, low inductance and high efficiency triple braid structure, and has obtained excellent transmission characteristics without deteriorating the slew rate.A CP type (conductive plastic) master volume is adopted.Modelstereo integrated amplifierEffective output (5Hz-20kHz, THD 0.007%)160W+160W(8?)220W+220W(4?)Effective output (1kHz, THD 0.003%)160W+160W(8?)220W+220W(4?)Total harmonic distortion (5Hz-20kHz)0.007% or less (8?)0.008% or less (4?)Intermodulation distortion (70Hz:7kHz=4:1)0.007% or less (8?)0.008% or less (4?)Output bandwidth (IHF, THD 0.02%)5Hz to 70kHz (8?)Frequency characteristic (1W)DC to 500kHz (+0dB, -3dB)Input sensitivity/impedance (1kHz)1V/33k?S/N ratio (IHF, A network)125dB or moreChannel separation (IHF, 1kHz)95dB or morerise time/fall time0.5 ?secSlew rate±260V/?secheadphone jack output150mW (8?)speaker used4 to 16? (A, B)8? or more (A+B)Input sensitivity/impedance (1kHz)Phono1, 2 (MM): 2.5mV (47k?)Phono1, 2 (MC): 0.1mV (0.2k? or less)AUX, Tuner: 200mV (33k?)Tape, Play 1, 2 (PIN): 200mV (33k?)Maximum permissible input (1kHz, THD 0.01%)Phono 1, 2 (MM): 330mVPhono 1, 2 (MC): 40mVOutput voltage (1kHz)Tape, Rec1, 2 (PIN): 200mV (at 47k?)Pre Out 1, 2: 1V (at 47k?)Max Pre Out (THD 0.05%): 10V (at 47k?)Output impedance (1kHz)Tape Rec 1, 2 (PIN): 600? or lessPre Out 1, 2: 600? or lessTotal harmonic distortionMC (1kHz, Rec Out): 0.005% or lessMM (20Hz - 20kHz, Rec Out): 0.005% or lessAux, Tuner, Tape Play1, 2: 0.005% or lessIntermodulation distortion (70Hz:7kHz=4:1)Aux, Tuner, Tape Play1, 2 (at 1V): 0.005% or lessFrequency characteristicPhono1, 2 (MC, RIAA deviation, 20Hz - 20kHz): ±0.2dBPhono1, 2 (MM, RIAA deviation, 20Hz - 20kHz): ±0.2dBSN ratio (IHF, A network,short circuit)Phono 1, 2 (MC): 76 dB or morePhono 1, 2 (MM): 91 dB or moreAux, Tuner, Tape Play 1, 2: 100 dB or moreInput conversion noise(A network, short circuit)Phono 1, 2 (MC): -156dBVPhono 1, 2 (MM): -143dBVChannel separation(IHF, 1kHz)Phono 1, 2 (MC): 70 dB or morePhono 1, 2 (MM): 75 dB or moreAux, Tuner, Tape Play 1, 2: 80 dB or moreSeparation between inputs(1kHz, short circuit)Tuner-Phono 1, 2 (MM): 90 dB or moreTape Play 1, 2-Phono 1, 2 (MM): 90 dB or moreTuner-Tape Play 1, 2: 100 dB or more Tape Play 1-Tape Play 2: 100 dB or moresubsonic filter16Hz (-3dB, 6dB/oct)power consumption400W (Electrical Appliance and Material Control Law)External dimensionsWidth 480x height 195x depth 450mmweight27.7kgRewired Audio Rewired Audio specialise in the repair of audio electronic equipment ranging from HiFi to pro audio. All Ebay listings have been serviced and repaired where necessary by a professionally qualified and experienced engineer. Terms And Conditions Of Sale •All communications regarding items listed on the Ebay website must be made via the Ebay messaging system. •Delivery applies to mainland UK and excludes highland and remote areas, please contact for a quote for these regions. •If you wish to return goods, you should notify Rewired Audio of your intention to do so within 30 days of the date of receipt by you. 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Unless evidence to the contrary is produced, it is our policy to treat any damage reported after 24 hours from delivery as having occurred whilst in your possession. Return FeeFee of £150 Additional Info We pride ourselves on customer service. If you have any problems with your item and feel you can’t leave us five stars please contact us. Please do not leave negative feedback without giving us the opportunity to rectify any problems. Collections are not available. No other articles are included with the item that are not stated in the description or shown in the photos. Equipment be PAT tested before sale where applicable.
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