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Basic technical parameters: Rectifier: 5Z3P (Class J military level tube) preamp tubes: 6N9P ×2 (Class J military level tube) Power tubes: EL34B × 2 Rated output power: triode connected 8Wx2(default), standard connection 12Wx2 Frequency response: 20Hz - 25KHz Total power consumption: 115W Output transformer: import Japanese Z11 0.35mm(22x45/50), very important to Provide sufficient power Total Harmonic Distortion: 1% (1kHz) Input Sensitivity: 500mV - 2000mV Input impedance: 100KΩ Output Impedance: 4Ω, 8Ω, suit for about 10-100w 88db(>=) speakers SNR: 88dB Dimensions (W × H × D ): 380 × 160 × 230mm Weight: about 9Kg Input Voltage: 110-120V / 50-60Hz Package: 1PC tube amplifier 1PC power cord