<br>You should take about 30-100h time to operate the amp.RUN-IN to the amp gives it's best and stable sound.so during the first 100h use time the sound maybe is not the best,you can also use your own run-in method. <br><b> Specifications:</b> <br>Output Power: 8W * 2 (Ultra-linear connection) <br>Frequency response: 20Hz-35KHz <br>Output Impedance: 4,8Ω <br>Total harmonic distortion: ≤ 1% (1kHz) <br>Input Sensitivity: 750MV <br>Input impedance: 100KΩ (three sets of input signal) <br>Voltage amplification: Dawn 6J8PJ × 2. <br>Power output tube: KT88 × 2. <br>Rectifier tube: 5Z3PA-T × 1 <br>Dimensions (W×D×H): 366×300 (including knob) × 185mm <br>SNR: 89dB <br>Weight: about 16.5 kg (114 power transformers, export version) <br>Gross weight: 18kg <br>Power Supply Voltage: AC 110V-120V/50Hz-60Hz(For United States） <br> <br><b> Features: </b> <br>With power tube current monitoring circuit, tube replacement upgrade ease. <br>Medical grade 5Z3PA-T rectification. <br>Imported 0.35 core output amplifier audio dedicated core, core stack thickness 86-50, A20 flux of 13,000 <br>Output transformer potting techniques, ensure that the output of the amplifier stability and reliability <br>Double chassis design，not easy deformed. <br>Output amplifier with a new imported 0.35 core manufacturing, high-purity copper wire package enameled, layered segmentation, string and connection method <br>Imported 0.35 thick core manufacturing power amplifiers <br>Output amplifier with high-grade stretch amplifier housing cover. <br>Power Transformers: new imported 0.35, stack thickness 60MM (114-60). <br>Output amplifier core: core 0.35 new imported thick high silicon (86-50). <br>Japanese production of ALPS potentiometer. <br>Chassis: mirror stainless steel chassis.