Product parameters: KT88 TUBE: Rated output power: RMS triode working status: 20W+20W RMS super linear working state 40W+40W Whole machine frequency response: 8HZ-50KHZ (-3dB) Harmonic distortion: -1% (1kHz) Signal to noise ratio: 90dB Input sensitivity: 300mV Use vacuum tube: 5BK7Ax4, KT88x4 Input impedance: 100kΩ Output impedance: 4Ω, 8Ω Whole machine power consumption: 280W Volume: 295×395x185mm (L*W*H) Net weight: 16.5kg EI34 TUBE: Rated output power: RMS triode working status: 18W+18W RMS super linear working state 35W+35W Whole machine frequency response: 8HZ-50KHZ (-3dB) Harmonic distortion: -1% (1kHz) Signal to noise ratio: 90dB Input sensitivity: 300mV Use vacuum tube: 5BK7Ax4, EI34x4 Input impedance: 100kΩ Output impedance: 4Ω, 8Ω Whole machine power consumption: 280W Volume: 295×395x185mm (L*W*H) Net weight: 16.5kg