NAD Stereo Integrated Amplifier 710 (Receiver), tested and working, T.H.D. ≤ 0,05%, audiophile reproduction. The family resemblance of this amp to older NAD amplifiers is obvious. Crude construction standards and an excess of point-to-point wiring lies in the past, and frame transformer have been replaced by toroid which produce lower noise, a reduced hum field and less interference with adjacent circuits. The Holmgren toroid transformer are also visible in the pictures. This NAD 710 Stereo Amplifier from the 1996s is in excellent working condition and offers versatile features with superb sound quality for audiophile enthusiasts looking for reliable vintage gear. The NAD 710 Receiver combined into one chassis the Model 310 amplifier and 412 tuner. Receivers are often regarded as convenience products only; as a consequence most budget receivers may have many features but poor amplifier and tuner performance. NAD has chosen the other route; trim off all the "fat" and instaed optimise the design and components directly related to performance. The NAD 710 exemplifies this. The biggest change to conventional amplifier design is to be found internally, however, courtesy of the Super Simple circuit topology. The super simple concept - the goal of the NAD engineers was to design a circuit which would an outstanding performance and supreme reliability - yet at a lower cost than using conventional technology. This has resulted in a totally new circuit topology, first used in the Model 310, appropriately named "Super Simple". The highly unusual arrangement of put devices and driver stages increases both the current capability and efficiency of the power amplifier. Many amplifiers specified at three times the power will not be able to match the Model 710's 20 Amps peak Current capability. Another benefit of the Super Simple concept is that on average it requires 50% less components compared to a conventional design of similar specification. The high level of performance is further achieved by using discrete circuitry for the entire amplifier section. The generous power supply employs a Holmgren toroidal transformer and separate voltage rails for the Left and Right channels. Loudspeakers with complex loads (such as low impedance) can be driven with ease. The tuner section can store up to 24 stations (12 AM; 12 FM). These are stored in a non volatile memory which allows the preset stations to remain in memory even if the unit is unplugged from the mains supply. Auto-Search and manual tuning is provided for both FM and AM. Unlike most other receivers and tuners, the Model 710 tunes in 25 kHz increments which makes for precise tuning on crowded FM bands. Specifications: Power Amp Section Continuous Average Power Output: 20 W into 8 Ω T.H.D. ≤ 0,05% (20 Hz - 20 kHz) Clipping Power: 25 W (max. power per channel) IHF Dynamic Headroom: 3 dB at 8 Ω IHF Dynamic Power: 80 W at 2 Ω; 60 W at 4 Ω; 40 W at 8 Ω Damping Factor: less than 100 Input Sensitivity/Impedance: 210 mV/20 k Ω / 220 pF Maximum Input Signal: less 10 V Signal-to-Noise Ratio: 93 dB ( 1 W A weighted) Frequency Response: 20 Hz - 20 kHz ±0,5 dB FM Tuner Section Usable Sensitivity: 1,5 µV 50 dB Quieting Mono : 2,5 µV Stereo : 30,0 µV Capture Ratio: 4,5 dB (45 dBf) Selectivity Alternate Channel: 78 dB Total Harmonic Distortion Stereo : 1 kHz Mono : 1 kHz 50 % mod 0,2% Signal-to-Noise Ratio: 70 dB Am Tuner Section Usable Sensitivity: 7 µV Signal-to-Noise Ratio: 45 dB The tuner's display doesn't light up, so I'm only selling it as an amplifier. Physical Section Dimensions (W x H x D): 435 x 91 x 273 mm Weight: 6 kg Packaging & Shipping: The device will be carefully packaged (internal protections, foam, bubbles, double cardboard if necessary) to ensure safe transport. Fast, tracked and insured shipping by professional carrier. The photos provided are contractual: you buy exactly what you see.