Fanuc AC Servo Amplifier Units. Ge Fanuc AC Series 6057, 6058 S, 6066 C. With over 51 + different Fanuc servo amplifiers in stock – CNC Electronics Inc is a company worth knowing about if you have a CNC machine tool that has Fanuc Servo Drives. Below lists servo amplifier units that we offer services upon either as exchange, testing, repair or surplus if available.