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CAGE: 99313 Communications & Power Industries. This is AN/SPS-49 material. An electron tube (Vacuum tube) is a glass or metal enclosure in which electrons move through the vacuum or gas from one metal... CAGE: 99313 Communications & Power Industries. This is AN/SPS-49 material. An electron tube (Vacuum tube) is a glass or metal enclosure in which electrons move through the vacuum or gas from one metal electrode to another. The vacuum tube is often used to amplify weak currents or act as a one-way valve (rectifier) for electric current.