GB413303A - Electric discharge amplifying tubes and method of operating the same - Google Patents

Abstract

413,303. Discharge apparatus. RADIO RESEARCH LABORATORIES, Inc., 597, Madison Avenue, New York, U.S.A. Jan. 9, 1933, No. 761. Convention date, April 14, 1932. [Class 39 (i).] In a discharge tube containing an ionizable medium and three or more electrodes one of which is a control grid, in which all the electrodes are mounted coaxially on insulating means contiguous with the press, the inter-electrode spaces are completely separated from one another by the electrodes and insulating means so that electrons cannot pass from one space to an adjacent space otherwise than by passing through the electrode between the spaces. The cathode may be cold or thermionic. As shown in Fig. 3, a stepped insulator 13, contiguous with the press 11 supports and spaces a rod-shaped anode 12, a control grid 14, a cathanode 15 and a cathode 16. The insulator closes the ends of the electrodes 14, 15 but complete closure of the space between the electrodes 15, 16 is not essential. The electrodes 14, 15 are of helical, meshed, or other openwork structure. In the tube shown in Fig. 4, a cold cathode 35, an anode 40, and two groups of input electrodes 36-39 are spaced in grooves in ring-shaped insulators 27-33, secured by a metal band 34, the members 27, 33 completely closing the ends of the assembly. In another tube, Fig. 6, not shown, similar to that shown in Fig. 3, a cylindrical cathode, coated with barium and strontium oxides, is heated by a discharge to an internal rod-shaped anode, and is surrounded by a control grid and an anode. In a further arrangement, a thermionic filament, wound on a central rod, is surrounded in turn by a control grid and anode, the electrodes being mounted on a stepped insulator. Specification 413,302 is referred to.