Output Circuit:Isolated output transformer;taps from 0-8 to 0-260V for small unitstaps from 0-65 to 0 - 3000V for big unitsRegulation: Adjustable to 0.1% line and loadShort Circuit Protection: Automatic reset thermostatFrequency Response: Full power 45Hz-20KHz, reduced power 20Hz-40KHzDistortion: 0.3% mid bandVolt Meter: Analog (not included in Model 80S)Input Power: 115 or 230 volts 50 or 60 Hz for small unit, 208 3 phase 5060 Hz for big units, unless otherwise specified can easily be wire for 190, 225, 240, 380, or 450V; 5060 Hz.Power Factor Range: +0.7 to -0.7 for full power; to zero @ reduced powerDimensions:Standard 19 rack by 5.25 by 14 deep for small unitsStandard 14 rack by 21 deep for 1000P and 1500P Standard 17 rack by 21 deep for 2000P & 3000P