rectifier tube

rec·ti·fi·er tube

an electronic tube, used in x-ray transformers, to convert alternating to direct current.
References in periodicals archive ?
One of the world's leading defense contractors, Raytheon built a company on innovations like the gas rectifier tube for radios and the microwave oven.
Among the company's achievements are the first application of microwave energy to cooking with the invention of the Radarange(tm) microwave oven; the world's first electronic depth sounder, the Fathometer(tm); a rectifier tube that converted early home radios from battery to plug-in operation; mass production breakthrough on magnetron power tubes, the heart of radar systems; and the first guided missiles to intercept and destroy aircraft and ballistic missiles.