MC-7R Vacuum tube PRE AMPLIFIER(RECTIFYING TUBE) Specification:Output Voltage:100mV-22VOutput Impedance:100KInput Voltage:100mv-2000mvIutput Impedance:100KDistortion Factor:0.003%Signal-to-Noises:91dBPower Dissipation:45WInputs:4 GroupsOutputs:2 GroupsFrequency:10Hz 75KHz±1dBVacuum Tubes:274B / 5Z3×112AX7×2 12AU7×2Size of outer carton:L49 x W36 x H30(cm)gross weight:10.5kg Customer Reviews