conrad-johnson Classic Sixty Tube Power Amplifier Power: 60 watts per channel RMS both channels driven into 4 ohms from 30Hz to 15KHz at not more than 1.5% total harmonic distortion or intermodulation distortion. (Can be re-connected internally for 8 or 16 ohm loads. 4 Ohm wiring is recommended for most loudspeakers.) Sensitivity: 0.7 V RMS to rated power. Frequency Response: 20Hz to 20 kHz +0/-.3 dB. Hum and Noise: 96 dB below rated power output. Phase: phase correct. Input Impedance: 100 kOhms Tube Complement: 1 x 6189 (12AU7), 2 x 6922, 4 x EL34. Bias adjustment via built in LED indicators. Dimensions: 13.375D x 17.375W x 6.625H. Net Weight: 41 lbs.