GB454361A - Improvements in or relating to thermiomic valve arrangements - Google Patents

Abstract

454,361. Thermionic valves. PINTSCH AKT.-GES., J., 71, Andreasstrasse, Berlin: April 20, 1936, No. 11333. Convention date, April 18, 1935. [Class 39 (i)] A valve for ultra-short wave use comprises a hollow resonating space bounded by conductive walls between the grid and the plate and a control space between grid and cathode coupled to the first space. In one form, Fig. 1, the grid 2 and plate 3 are prolonged to form a resonator space and an energy channel 4<1>, 8 to the aerial 6. The cathode leads comprise a wire 12 and a cylinder 11, and the cylinder 11 is coupled to the plate 3 by a short condenser 13. A cylinder 14, one quarter-wave long is attached to the lead 11 by a flange 15 and serves as a choke. The valve is sealed off by insulation between leads 11 and 12 and by seals 16, 17. The grid lead 19 is sealed through the lead 8 at 20. In a modification, the cylinder 11 is coupled to the resonating space by an annular flange carrying a short cylinder inside the plate 3. The cylinder 14 is coupled to the flange by a parallel flange and is sealed to the end of the plate 3. In another modification, Fig. 3, the outer resonating member 26 is closed at one end and the concentric cathode leads 28, 29 are taken out through a potential node. The lead 28 is prolonged to form a member 30 which, together with the lead 4<1>, forms a short-circuit condenser. The cathode is coupled to the plate by a condenser plate 33 secured to and spaced from the plate 3 by insulation 34. The coupling may instead be effected by making the member 30 continuous at its upper end with the member 4<1> which is insulated from the member 27 and by prolonging the member 27 into a cylinder between the members 30 and 4<1>. The grid may be closed at its lower end by a cap to which the filament bight is insulatingly connected. In another modification, the three electrodes are extended in each direction to form a quarter-wave short-circuiting condenser at the lower end and an aerial energy channel at the upper end, the cathode being connected to the plate by small condenser plates held on members passing through the grid. The shortcircuit condenser may be modified by the inclusion of a cylinder connected to the plate extension and arranged between the grid and cathode extensions, the coupling condenser plates being then dispensed with. Disc-shaped resonating spaces may be used with either method of coupling. The mode of operation of the valves is described in the Specification.