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Written in 1947 for Philips in The Netherlands, one of the most authoritative and comprehensive treatments of the nature and function of the vacuum tube at the time. First of the Philips Technical series. Examines step-by-step the underlying physics of electron theory as it relates to tubes, systematically discussing metals, chemistry, materials, construction, and manufacture. Valve properties, their function for various applications and a review of feedback techniques are featured. Also includes a set of useful appendices and a full index.