Pressing needs in several contemporary power, military, and scientific areas have put severe requirements on power conditioning components. In an effort to advance the state of the art, component selection and development tests were collected into a major proposal in 1978-79 at Los Alamos National Laboratory by three interested divisions. One significant portion of that proposal created the 300-kW Capacitor Test Facility (CTF). This paper is the first report of the facility operation and results.