GB326334A - Improvements relating to electron discharge tubes or thermionic valves - Google Patents

Improvements relating to electron discharge tubes or thermionic valves

Info

Publication number
GB326334A
GB326334A GB661129A GB661129A GB326334A GB 326334 A GB326334 A GB 326334A GB 661129 A GB661129 A GB 661129A GB 661129 A GB661129 A GB 661129A GB 326334 A GB326334 A GB 326334A
Authority
GB
United Kingdom
Prior art keywords
wires
wrapping
bundle
improvements relating
discharge tubes
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
GB661129A
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.)
Mullard Radio Valve Co Ltd
Original Assignee
Mullard Radio Valve Co Ltd
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 Mullard Radio Valve Co Ltd filed Critical Mullard Radio Valve Co Ltd
Priority to GB661129A priority Critical patent/GB326334A/en
Publication of GB326334A publication Critical patent/GB326334A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/08—Manufacture of heaters for indirectly-heated cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/15—Cathodes heated directly by an electric current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/22—Heaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

326,334. Mullard Radio Valve Co., Ltd., and Krol, B. Feb. 28, 1929. Vacuum tubes. - Thermionic cathodes or heaters of equipotential cathodes are formed by binding together a bundle of parallel fine tungsten wires by a wrapping of fine tungsten wire. A bundle of five wires may be held together by a close helical wrapping, the wires and wrapping being copper plated before assembly and oxidized before or after assembly. A coating of alkalineearth metal oxide may be produced as in Specification 274,233 by vaporizing the metal on to the cathode. The final heating of the filament to produce a satisfactory coating is sufficient to remove occluded gases, which are absorbed by magnesium or other getter. The copper plating may be omitted, the tungsten being oxidized.
GB661129A 1929-02-28 1929-02-28 Improvements relating to electron discharge tubes or thermionic valves Expired GB326334A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB661129A GB326334A (en) 1929-02-28 1929-02-28 Improvements relating to electron discharge tubes or thermionic valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB661129A GB326334A (en) 1929-02-28 1929-02-28 Improvements relating to electron discharge tubes or thermionic valves

Publications (1)

Publication Number Publication Date
GB326334A true GB326334A (en) 1930-03-13

Family

ID=9817617

Family Applications (1)

Application Number Title Priority Date Filing Date
GB661129A Expired GB326334A (en) 1929-02-28 1929-02-28 Improvements relating to electron discharge tubes or thermionic valves

Country Status (1)

Country Link
GB (1) GB326334A (en)

Similar Documents

Publication Publication Date Title
US2263164A (en) Anode
GB492983A (en) Improvements in or relating to electron discharge valves
GB326334A (en) Improvements relating to electron discharge tubes or thermionic valves
US1981620A (en) Electrode for electron discharge devices
US1722121A (en) Electron-discharge device
US1760526A (en) Electrode
US1889105A (en) Thermionic tube
US2040530A (en) Electron discharge device
US1699112A (en) maorae
GB271885A (en) Improvements in or relating to vacuum electric tube devices
GB274507A (en) High emission thermionic valve
GB300613A (en) Improvements in vacuum electric tube devices
GB281262A (en) Improvements in or relating to electron emitting cathodes
GB238123A (en) Improvements in thermionic triodes
GB350938A (en) Improvements in vacuum electric tube devices
GB477787A (en) Electric discharge tube
GB297028A (en) Electron emitters and process of making same
GB251971A (en) Improvements in or relating to electron discharge tubes or thermionic valves
GB365303A (en) Electron tube with incandescent cathode
GB204910A (en) Improvements in electric discharge tubes and the like
GB289975A (en) Improvements in or relating to electric vacuum or gas-filled tubes
GB370722A (en) Improvements in thermionic cathodes
GB486068A (en) Improvements in and relating to the gettering of metallic bulb electric discharge tubes
GB225926A (en) Improvements in thermionic valves
GB214455A (en) Improvements in electric discharge tubes