GB643281A - Thermionic valve - Google Patents

Abstract

643,281. Thermionic valves. EITELMcCULLOUGH, Inc. Jan. 20, 1947, Nos. 1777, 1778 and 1779. Convention dates, Feb. 4, 1946, April 27, 1946, and May 29, 1946. [Class 39 (i)] A thermionic valve comprises a plurality of valve units, each with electrodes in an individual envelope, a rigid member tying the units together and providing an electrical connection between corresponding electrodes. In Fig. 5, each tube unit comprises an external anode 43, a screen grid 47 connected by an internal screening bracket 58 to a ring 57 forming part of the envelope, a control grid 46 connected by conductors 61 to a spider 73 and terminal 71 and a cathode 44 connected by leads 62 to conductor rings 77 and terminals 74. The anodes 43 of copper connected by flanges 52 to glass sections 54 are sealed by solder into recesses in a ring-shaped core 63 of copper provided with internal and external fins 67. A cup-shaped metal piece 69 embraces the units and insulatingly supports the control grid and cathode terminals. In another form (Fig. 3, not shown) the cooler is sectional and contains triode units. with the cooler fins transverse to the longitudinal axis of the valve units and forming a central passage for the cooling air. The fins may be separate and formed with integral flanges to make them interfitting. In another modification (Fig. 10, not shown), the connection for the screen grid extends inside and outside the valve units and forms an overall electrostatic shield between input and output members. The cooling fins are formed by a corrugated strip of metal. An annular cap covers the top ends of the valve units. Fig. 11 shows a water-cooled valve with triode units, the grid connection 118, 131 serving as the electrostatic screen between anode 103 and cathode 122. The water circulates in hollow annular jackets 147.