Copley Controls model 215 dc servo amps ( 30 available ) Some of these units are new and some are factory repaired. They are a compact unit for dc servo motor control. They require a top card ( not included ) model MB2 for input and output connections. ( About $80.00 from Copley ) They need a dc input buss voltage 40 to 80 vdc and provide 10 amp cont. 20 amp peak power.