SpecificationsModel EVO 100-4 for EL34 / KT88Power Ultra-Linear40 / 42 Watts per channel Stereo 82 / 84 Watts MonoFrequency Response12 Hz – 85 kHz +/- 1 dB10 Hz – 95 kHz +/- 3 dBTHD with AABB< 0.2% @ 1W; less than 2% at rated power Stereo < 0.17% @ 1W; less than 2% at rated power Mon..