For sale is a Kepco, Inc. Model RMK28-B Power Supply. Input: 100-130VAC, 47-440Hz., 4 amps max. or 130-170VDC. 28V Output. Output current up to 7.2 amps at 30 degrees Centigrade. Adjustment pots for voltage adjust / over-current / over-voltage. Comes with removable 120V AC power cord.