Request InfoSpellman High Voltage Electronics Corp.The EBM series triode modules have been developed by Spellman High Voltage Electronics Corp. to drive electron beam columns for scanning electron microscopes. In a package made compact by surface-mount and proprietary encapsulation technologies, the modules comprise an accelerator that is programmable to 30 kV at 300 µA and floating bias and filament sources referenced to the accelerator's voltage. 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