Sansui AU-D707F EXTRA Premain Amplifier used FROM JAPAN
- Condition: Used
- Price: 490.02 EUR
- Status: unsold
- Item number: 365250553354
- Seller: yama19-54 (36|100.0%)
- Seller information: Commercial (with base shop)
- Item location: iwate ken
- Ships to: US
- Shipping: 0,0 EUR
- on EBAY
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Description
An integrated amplifier improved based on the AU-D707F. The power amplifier section uses a Super FF and a diamond differential circuit. The first stage uses a constant current differential circuit using dual FETs that can pass large currents with low noise, and the second stage is equipped with a dual complementary differential circuit. This increases the current supply to the power stage, and sends the necessary drive current to the power stage even for complex peak inputs. The power stage uses a Super FF with improved accuracy and uses excellent materials such as NM-LAPT to achieve low distortion and high power. In order to support MC cartridges, it is equipped with an MC head amplifier using a differential two-stage symmetrical circuit. In addition, it is equipped with an input gain changeover switch to support all MC cartridges, and can be switched between High and Low positions. The equalizer amplifier section is newly equipped with a Hi-Precision equalizer. This covers RIAA deviation of 20Hz to 300kHz ±0.2dB, and the frequency characteristics are more precise.The first stage uses low-noise, high-gm dual FETs, forming a push-pull drive pure complementary SEPP output with two differential stages and a current differential with a current mirror. In addition, a DC servo is used to stabilize the DC region and eliminate the output capacitor.In addition, a linear servo regulator is used for the equalizer power supply section, enabling a clean and stable power supply. The power supply section is independent of the left and right, with two windings and three power supplies.The transformer uses a large power transformer with excellent regulation, and the capacitor is equipped with a newly developed ? capacitor totaling 48,000?F. The ? capacitor was newly developed for the AU-D907F Extra, and is an ultra-low magnification type that has excellent tracking ability even for transient charging and discharging.In addition, fast recovery diodes with high switching speed are used for all rectifier diodes, improving the responsiveness of regulation. In order to reduce magnetic distortion, a copper-plated chassis is used for the chassis. In addition, every detail has been carefully considered, including the use of a large number of NM elements and a construction that is less susceptible to magnetic distortion. A simple and straight construction is used to minimize the signal path. A heat dissipation system using heat pipes, three-dimensional wiring, and a remote-controlled speaker output using relays create a neat construction. A twin relay SP switch is used, allowing for two-way connection. A 16Hz subsonic filter and a 20kHz supersonic filter are included as filters. Gold-plated terminals are used for the phono input terminals. Equipped with a recording selector with two independent sources and a two-circuit tape monitor/copy function. Available in two colors: black and silver. Type: Integrated DC amplifier
Effective output: 100W+100W (8?, 10Hz-20kHz, THD 0.003%) 100W+100W (8?, 1kHz, THD 0.002%) Total harmonic distortion (10Hz-20kHz, effective output): 0.003% or less (8?) Intermodulation distortion (60Hz:7kHz=4:1, SMPTE): 0.003% or less (8?) Output bandwidth (IHF, both channels operating, THD 0.02%): 5Hz-80kHz (8?) Damping factor (new IHF, 20Hz-20kHz): 100 (8?) Frequency response (1W): DC-300kHz +0 -3dB Envelope distortion Below the measurement limitTIM distortion (Sawtooth method) Below the measurement limitThrough rate ±200V/?sec (8?)Rise time 0.5?sec Input sensitivity/input impedance (1kHz) Phono1, 2 MM: 2.5mV/47k?Phono1, 2 MC (Low/High): 100?V/300?V (100?)Tuner, Aux, Tape play1, 2: 250mV/27k?Phono maximum allowable input (1kHz, THD 0.01%) MM: 200mVMC: 25mV (low), MC head amplifier systemOutput level/impedance (1kHz) Tape rec(PIN):250mV(47k?)/600?Total harmonic distortion (20Hz-20kHz, 5V output) Amplifier Phono1,2 MM:0.005% or lessPhono1,2 MC:0.006% or lessRIAA deviation (MM, Rec out) 20Hz-300kHz ±0.2dBSignal-to-noise ratio (A network, short circuit) Phono1,2 MM:90dB or morePhono1,2 MC:74dB or moreTuner, Aux, Tape play1,2:110dB or morePhono input equivalent noise(A network, short circuit) Phono1,2 MM:-142dBVPhono1,2 MC:-154dBVChannel separation (1kHz) Phono1,2 MM:60dB or morePhono1,2 MC: 50dB or moreTuner, Aux, Tape play: 80dB or moreTone control Bass: ±10dB (50Hz)Treble: ±10dB (10kHz)Tone selector Bass: 150Hz, 300HzTreble: 3kHz, 6kHzFilter Low: 16Hz (-3dB, 6dB/oct)High: 20kHz (-3dB, 6dB/oct)Audio muting -20dB Rated power consumption (Electrical Appliance and Material Control Law) 250WExternal dimensions Width 460 x Height 160 x Depth 404mmWeight 14.7kg
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