<br>Warm reminder: You should take about 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> Specification:</b> <br>Rated output power: <br>25W + 25W (RMS Triode) <br>45W + 45W (RMS Ultralinear) <br>Harmonic distortion: 1% (1kHz) <br>Frequency response: 15Hz ~ 30kHz (-1.5dB) <br>Input Sensitivity: 280mV; 520mV (pre in) <br>Input impedance: 100KΩ <br>Output impedance: 4Ω 8Ω <br>Signal to noise ratio: 92dB <br>Left and right output balance: <0.5db <br>Power consumption: 260W <br>Vacuum tube: 12AX7 × 1. 12AU7 × 2. KT88 × 4. 5AR4 × 1 <br>Dimension (W × D × H): 410 mm × 335 mm × 198 mm <br>Net Weight: 23kg <br>Gross weight: 25kg <br>Power supply: 110V - 120V 60Hz/50Hz.(For United States) <br><b> If you need to use it in Europe, there is a selective switch to set it to be 220V-240V ,It works well in Europe too. </b> <br>Working conditions: Temperature: 0 ℃ ~ 40 ℃ Humidity: 20% ~ 80% <br>Storage conditions: Temperature: -20 ℃ ~ 70 ℃ Humidity: 20% ~ 90% <br> <br><b>Packing include: </b> <br>1 x Vacuum tube amplifier <br>1 x English Instruction manual and a circuit diagram(Schematic) <br>1 x Infrared remote control <br>1 x Tube protective cover <br> </b> <br><b>ONE-YEAR WARRANTY !!! </b>