Leybold NT 12 controller/power supply for a turbomolecular pump. This is the version of the NT 12 needed to provide the 1050-Hz drive required by the Leybold Turbovac 35 LS pump found in the Inficon UL 200 helium leak detector. Part number 20061635 aka 200 61 635 Z01 00408. North America version–115 VAC, though the label also says 90-140V. Pulled from clean equipment. I have no complete system available to properly test it by swapping it in, but can perform other electrical checks you may want. I also guarantee your satisfaction with 30-day return privilege! See my other listings for other Inficon UL 200 parts.