Spellman High Voltage Electronics Corporation is the world's leading independent manufacturer of high voltage dc power supplies, x-ray generators and MonoblockĀ® x-ray sources. Spellman High Voltage designs and manufactures custom and standard high voltage dc power supplies ranging from 120mW to 150kW with voltages from 250V to 500kV. Spellmanās power supplies are used in a vast array of applications serving the medical, industrial and scientific communities.