Plastic Capacitors, Inc.
Manufactures a wide variety of capacitors, high voltage transformers, AC to DC power packs, pulse forming networks, tesla coil capacitors, military products and specialty L/C/R networks...
http://www.plasticcapacitors.com/

HSP Hochspannungsgeraete Porz GmbH
Hersteller und Anbieter von Hochspannungsdurchführungen und Hochspannungskondensatoren. Manufacturer of high voltage bushings and high voltage capacitors.
http://www.hspkoeln.de

Novacap
Manufacturing multilayer ceramic chip capacitors include surface mount capacitors from the 0402 case size to larger high voltage units (up to 20kV) for commercial and high reliability applications.
http://www.novacap.com/

Hivolt Capacitors, Ltd.
We at Hivolt Capacitors Limited have been designing and manufacturing high voltage capacitors at our factory in Northern Ireland since 1968.
http://www.hivoltcapacitors.com/

General Atomics Energy Products
Manufacturer of advanced film capacitors, high voltage capacitors, high energy capacitors, high voltage power supplies and pulse power systems
http://www.gaep.com

200 kV Voltage Multiplier
By using only capacitors and diodes, these voltage multipliers can step up relatively low voltages to extremely high values, while at the same time being far lighter and cheaper than transformers.
http://www.powerlabs.org/cascade.htm

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

Capacitor Industries
Capacitor distributor of aluminum electrolytic , motor run, high voltage capacitors and more. Visit and learn more of our large inventory of quality capacitors with competitively low pricing.
http://www.capacitorindustries.com/

High Energy Corp.,
High Energy, high voltage, high current, energy storage, ceramic capacitors, induction heating, filters, laser , pulse capacitors, X-ray , power supplies, RF generators, radio broadcast equipment,
http://www.highenergycorp.com/index.html

Cardwell Condenser
High value, high voltage variable capacitors. They also have Inductors and other RF components.
http://www.cardwellcondenser.com/