Product Detail Input Impedance: 500K Ohms Output Impedance: 10K Ohms or less Maximum Gain: 48.5 dB (1.6 KHz) Internal Circuit Voltage: 30 VDC (DC-DC Converter) Current Consumption: 260 mA / 9 VDC . The "Maxon 9-Series True Tube Overdrive" is best product for you. We recommended Maxon 9-Series True Tube Overdrive