Specifications:

Power:
ART Amplifier - 275 watts from 30 Hz to 15 KHz at no more than .5 % THD or IMD into 4 ohms (also available connected for 8 or 16 ohm loads)
ARTsa Amplifier – 140 watts per channel from 30 Hz to 15 KHz at no more than 1.5 % THD or IMD, both channels driven into 4 ohms (also available connected for 8 or 16 ohm loads)
Sensitivity: 1.8V to rated power Frequency Response (at 10 watts): 20 Hz to 20 kHz, +/- .25 dB
Frequency Response (at 10 watts): 20 Hz to 20 kHz, +/- .25 dB
Hum and Noise: 108 dB below rated power
Input Impedance: 100 kOhms
Tube Complement:
ART - 1 x M8080, 1 x 6N30P, 8 x KT120
ARTsa – 1 x 6189, 2 x 6N30P, 8 x KT120
Dimensions: 18.75D x 19W x 7.13H inches
Weight: ART - 83 Lbs. ARTsa – 82 Lbs