SPECIFICATIONS (500W)ALL-TUBE monoblock design 10 x KT90 or 6550C output tubesHigh current double 6414W driver stage12AT7EH large plate Electro-Harmonix Russian input tubeBALANCED & UNBALANCED inputsMUTE switchTRIODE / TETRODE switchingS0FT-START/ EVER-WARM standby modeMANLEY Precision output transformerFactory set for 5 ohms nominalFront panel bias measurement and adjust (hiding under the black insert)Large filter / reservoir capacitors 3800uF x 2Angled rear of chassis provides for easy connectionsWBT binding postsInput sensitivity: 1VGain: 32dB tetrode; 30dB in triodeInput Impedance RCA: 116 Kohm @ 1KHzInput Impedance XLR: 270Kohm @ 1KHz; 20Kohms @ 20KHz; 38Kohm @ 20HzS/N Ratio: -80 dBDynamic Range: 96dBFLAT frequency response: 10 Hz - 30 KHz continuousPower Consumption: 30 Watts in "EVER-WARM"Full power (tetrode): 500WFull power (triode): 275WOperating Mains Voltage: Factory set for 100V, 120V, or 220-240VAC operation; changeable withpower transformer re-wiring and fuse value change.Mains Voltage Frequency: 50~60HzMains Fuse 100-120VAC operation: MDA 10 Amp SLO-BLO Ceramic Time-Delay fuseMains Fuse 220-240VAC operation: MDA 8 Amp SLO-BLO Ceramic Time-Delay fuseB+ Fuse: MDA 1 1/2A SLO-BLO Ceramic Time-Delay fuseDims: W=19", D=13", H=9"Shipping weight: 82 lbs. each13