GB492983A - Improvements in or relating to electron discharge valves - Google Patents

Improvements in or relating to electron discharge valves

Info

Publication number
GB492983A
GB492983A GB1459937A GB1459937A GB492983A GB 492983 A GB492983 A GB 492983A GB 1459937 A GB1459937 A GB 1459937A GB 1459937 A GB1459937 A GB 1459937A GB 492983 A GB492983 A GB 492983A
Authority
GB
United Kingdom
Prior art keywords
insulation
grid
helix
notched
cathode
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
Application number
GB1459937A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAROLD ALFRED MALPAS
Original Assignee
HAROLD ALFRED MALPAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HAROLD ALFRED MALPAS filed Critical HAROLD ALFRED MALPAS
Priority to GB1459937A priority Critical patent/GB492983A/en
Publication of GB492983A publication Critical patent/GB492983A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/38—Control electrodes, e.g. grid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0015—Non-sealed electrodes

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

492,983. Thermionic valves. MALPAS, H. A. May 26, 1937, No. 14599. Drawings to Specification. [Class 39 (i)] An electron-discharge valve has an anode, a thermionic cathode, preferably indirectlyheated and a control grid of wire having a diameter of 0À1 1 mm. or less bent into a helix and supported by notched metal rods which are wholly or partially coated with a thin layer of insulation so that the turns of the helix are insulated from one another and at their minimum distance from the cathode are separated from it by 0À5 mm. or less. The insulation may be the oxide of a metal such as nickel, aluminium or magnesium and need not be of higher resistance than a few hundred ohms. The grid wires may also be coated with insulation where they touch the support. In a modification, notched thin-walled tubes of compressed magnesium oxide are slipped over wire rods. More than one grid may be provided. Very large amplifications are said to be obtainable with a single valve.
GB1459937A 1937-05-26 1937-05-26 Improvements in or relating to electron discharge valves Expired GB492983A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1459937A GB492983A (en) 1937-05-26 1937-05-26 Improvements in or relating to electron discharge valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1459937A GB492983A (en) 1937-05-26 1937-05-26 Improvements in or relating to electron discharge valves

Publications (1)

Publication Number Publication Date
GB492983A true GB492983A (en) 1938-09-30

Family

ID=10044130

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1459937A Expired GB492983A (en) 1937-05-26 1937-05-26 Improvements in or relating to electron discharge valves

Country Status (1)

Country Link
GB (1) GB492983A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416799A (en) * 1942-08-04 1947-03-04 Western Electric Co Electron discharge device
US2486829A (en) * 1945-08-31 1949-11-01 Zenith Radio Corp Supporting means for vacuum tube electrodes
DE1021088B (en) * 1954-02-18 1957-12-19 Siemens Ag Tension grid for electrical discharge vessels
DE1032854B (en) * 1954-03-03 1958-06-26 Siemens Und Halske Ag Grid electrode for electrical discharge vessels
DE1064154B (en) * 1956-09-29 1959-08-27 Standard Elek K Lorenz Ag Electrical discharge vessel with a grid system consisting of an insulating body as a carrier and a method for producing a grid system
DE1229195B (en) * 1961-04-06 1966-11-24 Philips Patentverwaltung Control electrode (grid) for an electrical discharge tube
EP2282325A3 (en) * 2009-07-29 2011-05-18 General Electric Company Method of fast current modulation in an X-ray tube and apparatus for implementing same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416799A (en) * 1942-08-04 1947-03-04 Western Electric Co Electron discharge device
US2486829A (en) * 1945-08-31 1949-11-01 Zenith Radio Corp Supporting means for vacuum tube electrodes
DE1021088B (en) * 1954-02-18 1957-12-19 Siemens Ag Tension grid for electrical discharge vessels
DE1032854B (en) * 1954-03-03 1958-06-26 Siemens Und Halske Ag Grid electrode for electrical discharge vessels
DE1064154B (en) * 1956-09-29 1959-08-27 Standard Elek K Lorenz Ag Electrical discharge vessel with a grid system consisting of an insulating body as a carrier and a method for producing a grid system
DE1229195B (en) * 1961-04-06 1966-11-24 Philips Patentverwaltung Control electrode (grid) for an electrical discharge tube
EP2282325A3 (en) * 2009-07-29 2011-05-18 General Electric Company Method of fast current modulation in an X-ray tube and apparatus for implementing same
US8027433B2 (en) 2009-07-29 2011-09-27 General Electric Company Method of fast current modulation in an X-ray tube and apparatus for implementing same

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