MU-4 EVO is a stereo integrated amplifier supporting KT-120 or KT-88/6550 tubes in the output stage. Output tubes work in Push-Pull and fixed bias mode with moderate 8dB negative feedback. It yields up to 70 Watts of power per channel and vivid, dynamic sound. Biases of output tubes pair in each channel are maintained in exact symmetry by a specialized servo. As a result, harmonic distortion, noise and hum are effectively eliminated.  Output transformers work in ultra linear mode for harmonic distortion reduction. A massive 400W toroidal transformer guarantees a high margin of spare power.