GB780838A - Improvements in electronic tube and apparatus therefor - Google Patents
Improvements in electronic tube and apparatus thereforInfo
- Publication number
- GB780838A GB780838A GB7076/51A GB707651A GB780838A GB 780838 A GB780838 A GB 780838A GB 7076/51 A GB7076/51 A GB 7076/51A GB 707651 A GB707651 A GB 707651A GB 780838 A GB780838 A GB 780838A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- grid
- screen
- screen grid
- anode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J21/00—Vacuum tubes
- H01J21/02—Tubes with a single discharge path
- H01J21/06—Tubes with a single discharge path having electrostatic control means only
- H01J21/065—Devices for short wave tubes
Landscapes
- X-Ray Techniques (AREA)
- Electron Sources, Ion Sources (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
780,838. Thermionic valves. MACHLETT LABORATORIES, Inc. March 27, 1951 [March 25, 1950], No. 7076/51. Class 39(1). [Also in Group XL(c)] A double-ended tube comprises an evacuated chamber, a cathode electrode and co-operating control grid, screen grid and anode electrodes in the form of surfaces of revolution, the cathode control grid and screen grid having corresponding first and second edges respectively, connection members in the form of surfaces of revolution connected to the first edges of the grids and extending to the exterior, and an internal radiofrequency capacitive coupling between the second edges of the screen grid and cathode. In Fig. 1 the cathode in a cylinder 12 heated by four heating coils 10, of which two are shown ; the control grid 44 is supported by a conical connection member 43, and the screen grid 37 is supported by a conical connection member 36; all the connection members extend through the envelope and are joined together by ceramic discs, the grid support having an external coating 50 of dielectric material so that a coaxial line may be joined to it for R.F. purposes but insulated from it for D.C. The capacitive connection between the cathode and the screen grid is provided by a dielectric coating 39 on the cathode support surrounded by a cylinder 38 connected to the lower end of the screen grid through a hairpin bend 40 which allows for thermal expansion of the grid and prevents conductive material depositing on the dielectric 39. The anode 23 is provided with cooling pins 27 and is insulated from supports 30, 31 and connecting cylinders 32, 33 by dielectric rings 28, 29 so that an R.F. connection can be made through the cylinders 32, 33 without there being any D.C. connection. Since the screen grid is capacitively connected to the cathode an input may be applied between the screen and control grids and an output taken between the screen grid and anode ; the screen grid may be earthed. To prevent resonances in the space between the grid support 43 and the cathode this space may be made smaller by providing the cathode with a metallic end cap, or alternatively the conductive end 41 of the grid support may be replaced by an insulator so that the grid support becomes a waveguide with a cut-off higher than the desired operating frequency. The axial length of the electrodes should be less than 1/16 of a wavelength. In a modification, Fig. 4, a double tetrode is provided comprising a cylindrical cathode 81, control grids 84, 95 on each side of the cathode, screen grids 85, 96 and anodes 86, 97. The screen grids are capacity coupled to the cathode by cylindrical members 109, 113 and dielectric members 111, 114; the control grids may be coupled by either two (as in the Figure) or four neutralizing capacities 115, 116 to the anodes of the opposite electrode system. The central anode 86 may be provided with a cooling coil 87, and the outer anode 97 may be provided with fins or may have a cooling coil 98. The connection members extend through the envelope and are separated by ceramic rings as before. In a further modification, Fig. 6, the electrodes are planar and comprise a cathode 121, control grid 132, screen grid 135 and anode 139 ; the inner edge of the screen grid is attached to a supporting conducter 143 which is separated from the centre of the cathode by a dielectric disc 122. The centre of the cathode is non-emissive and is here equivalent to a second edge.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US780838XA | 1950-03-25 | 1950-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB780838A true GB780838A (en) | 1957-08-07 |
Family
ID=22141812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7076/51A Expired GB780838A (en) | 1950-03-25 | 1951-03-27 | Improvements in electronic tube and apparatus therefor |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB780838A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1103472B (en) * | 1957-10-18 | 1961-03-30 | Siemens Ag | High performance electron tubes for very high frequencies |
DE2160082A1 (en) * | 1970-12-04 | 1972-06-15 | Thomson Csf | Ultra-high frequency tetrode |
-
1951
- 1951-03-27 GB GB7076/51A patent/GB780838A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1103472B (en) * | 1957-10-18 | 1961-03-30 | Siemens Ag | High performance electron tubes for very high frequencies |
DE2160082A1 (en) * | 1970-12-04 | 1972-06-15 | Thomson Csf | Ultra-high frequency tetrode |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2169396A (en) | Signal-translating apparatus | |
US2353742A (en) | High-frequency apparatus | |
US2115521A (en) | Magnetron | |
US2063341A (en) | Electron discharge device | |
US2044369A (en) | Electron discharge device | |
US2416315A (en) | Electron discharge device | |
US2441792A (en) | Stacked electrode assembly for electron discharge devices | |
US2402600A (en) | Electron discharge device | |
GB780838A (en) | Improvements in electronic tube and apparatus therefor | |
US2421039A (en) | Cathode structure | |
US2404226A (en) | High-frequency discharge device | |
US2412998A (en) | Electron discharge device | |
US2471037A (en) | Electron discharge device employing cavity resonators | |
US3305799A (en) | Adjustable coupler for electron tubes; adjustment made outside the vacuum and through a dielectric vacuum seal | |
US2427558A (en) | High-frequency oscillator | |
US2879440A (en) | High frequency tube | |
US2608670A (en) | High-frequency tube structure | |
US2428609A (en) | High-frequency electric discharge device | |
US2163244A (en) | Signal translating apparatus | |
US2423443A (en) | High power electronic discharge device for generating ultra high frequency radiations | |
US3304461A (en) | Support for elongated electrodes of electron beam tube | |
US2667593A (en) | Electron tube | |
US2641657A (en) | Radio-frequency transmission device | |
US2573190A (en) | Ultra high-frequency electron tube | |
US2841736A (en) | Electron tube and filamentary cathode |