nobsound ms-30d mkii bluetooth amplifier tube amplifier 110v 220v amp 2.1 channel amplifier ms-10d mkii upgrade amp

output power:25w+25w,input power:100w,input impedance: 47kohm,input sensitivity: 300mv,snr: >80db,frequency response:28hz~20khz,output impedance:4~16ohm,tube:6n1*two 6j15*two