Our service is ready to help u any time, your feedback is extremely important to us. Audio Outputs Stereo L/R RCA. The resistance adopts American DALE/VISHAY precision resistance. Input impedance47K SNR 90dB Frequency response 10Hz-30KHz Distortion 1% Colour Black Working voltage AC115V or AC230V (optional) Dimensions (WHD) 32090308MM Net weight about 4.63KG Package list 1 Ã Finished tube preamplifier.