Chirk Industry Co., Ltd.
Manufacturer of high voltage transformers, high voltage switching power supplies, negative ion generators, ozone generators, and electrostatic precipitators.
http://www.chirkindustry.com

National Electric Coil
Produces high voltage coils and bars for turbine generators, hydro generators and high voltage motors including rewind, repair and retrofit services.
http://www.national-electric-coil.com

Chaos Labs High Voltage Division
High Voltage experiments and generators, like Vacuum Tube Tesla Coil, Marx Generator, HV Switching Power Supply, and EMP weapons.
http://hvprojects.tripod.com/highvoltage/

Directed Energy, Inc.
High voltage pulse generators, pulsers, modulators and pulsed voltage sources
http://www.directedenergy.com/

High Voltage Connection
Sales representative for high voltage power supplies and other high voltage products. Includes technical articles on high voltage.
http://www.highvoltageconnection.com

What is High Voltage
eeProductCenter delivers a full spectrum of critical design information about the latest ICs and electronic components for engineers facing challenging, design-in decisions. eeProductCenter continuously reports new product news with analysis and insight to help you make more informed product/technology decisions.
http://www.chipcenter.com/circuitcellar/november99/c119r16.htm

High Voltage Concepts
Designs and manufactures high voltage power supplies and high voltage diagnostic equipment, including general purpose supplies, x-ray power supplies and high voltage dividers.
http://www.hvconcepts.com/

High Voltage Information
High voltage reference information, including articles, books and relevant links. Also included is a buying guide for high voltage parts, instruments and services.
http://www.highvoltageinfo.com/

Parsons Peebles
Parsons Peebles Generation Limited is a leading worldwide supplier of high voltage motors and generators, specialising in the design of machines for power generation and oil, gas and petrochemical industries
http://www.parsons-peebles.com

Chaos Labs High Voltage Projects
High voltage projects including ignition coil driver, high voltage transformers, and a 60 kV pulse generator.
http://members.tripod.com/hvprojects/highvoltage/