Koch Amps ART-4502 Rackmount Poweramp, e-guitar poweramp, 1HE, 19", 2 channels, 2x 45 watts stereo or 1x90 watts mono, 1x 12AX7 valve for each channel, presence- and depth control for each channel, volume control for each channel, output power: 90 watts@8 ohms, 70 watts@16 ohms (mono) or 2x50 watts@4 ohms, 2x 45 watts@8 ohms or 2x 35 watts@16 ohms, 2 parallel mono jack outputs for each channel, selectable input levels (-10 dB/0 dB), weight: 5,5 kg