Variable Q Tube Equalizer Inherited from the 800RB, this unique tube design varies the EQ bandwidth to retain a musical response even at extreme settings. High Tech Power Switch mode power amp and supply deliver a crushing 800 Watts of cool running power. Intelligent Cooling Temperature controlled fans keep the amplifier cool delivering only the required amount of air, reducing noise and dust intake. High Voltage Tubes The signal path for gain, EQ, contour and the DI are 100% tube driven, achieving classic tube performance with 300V plates. Variable Q Tube Equalizer Inherited from the 800RB, this unique tube design varies the EQ bandwidth to retain a musical response even at extreme settings. Dimensions 10.75 x 12.25 x 1.75" 5.5 LBS