GB668906A - Improvements in or relating to electric discharge tubes - Google Patents
Improvements in or relating to electric discharge tubesInfo
- Publication number
- GB668906A GB668906A GB7426/50A GB742650A GB668906A GB 668906 A GB668906 A GB 668906A GB 7426/50 A GB7426/50 A GB 7426/50A GB 742650 A GB742650 A GB 742650A GB 668906 A GB668906 A GB 668906A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- per cent
- electric discharge
- march
- spacing
- 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
- Electron Sources, Ion Sources (AREA)
Abstract
668,906. Thermionic valves. PHILIPS ELECTRICAL INDUSTRIES, Ltd. March 24, 1950 [March 29, 1949], No. 7426/50. Class 39 (i). A device for amplifying or modulating frequencies of 1000 Mc/s. or higher comprises an electric discharge tube, the cathode of which is provided at the interior with a supply of alkaline earth metal compounds and which has at least part of its wall consisting of a homogeneously porous sintered body of one or more of the metals tungsten, molybdenum, tantalum, hafnium or niobium, and the pores of the porous body being the largest apertures in the wall, characterized in that the tube is adjusted so that in the absence of signal voltage at least 10 per cent of the saturation current passes the potential minimum between the cathode and control electrode, the spacing between the cathode and control electrode being less than 30 Á. This method of operation reduces the noise and the grid damping. The spacing between cathode and grid may be 17 Á and the static current is preferably at least 20 per cent and may be 30 per cent or even 50 per cent of the saturation current. Specification 641,581 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL668906X | 1949-03-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB668906A true GB668906A (en) | 1952-03-26 |
Family
ID=19798848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7426/50A Expired GB668906A (en) | 1949-03-29 | 1950-03-24 | Improvements in or relating to electric discharge tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB668906A (en) |
-
1950
- 1950-03-24 GB GB7426/50A patent/GB668906A/en not_active Expired
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