American Capacitor - Metallized polyester high voltage capacitors. www.americancapacitor.com/Highvoltage.htm
Cardwell Condenser - High value, high voltage variable capacitors. They also have Inductors and other RF components. www.cardwellcondenser.com
Cera-Mite Corporation - Ceramic Capacitors Ceramic High Voltage components www.ceramite.com
Cornell Dubilier HV caps - Suppliers of high voltage DC, AC and pulse capacitors. www.cornell-dubilier.com
Duracap International Inc. - Duracap manufactures Mallory electrolytic capacitors, wirewound potentiometers and inductuners to customer specifications. Based in Woodstock, Canada. www.duracap.com