GB432733A - Improvements in and relating to cathodes for thermionic valves - Google Patents

Improvements in and relating to cathodes for thermionic valves

Info

Publication number
GB432733A
GB432733A GB478434A GB478434A GB432733A GB 432733 A GB432733 A GB 432733A GB 478434 A GB478434 A GB 478434A GB 478434 A GB478434 A GB 478434A GB 432733 A GB432733 A GB 432733A
Authority
GB
United Kingdom
Prior art keywords
tube
coils
thermionic valves
emitting surface
insulating material
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
GB478434A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB478434A priority Critical patent/GB432733A/en
Publication of GB432733A publication Critical patent/GB432733A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Electron Sources, Ion Sources (AREA)

Abstract

432,733. Thermionic valves. BULL, C. S., 33, Micawber Avenue, Hillingdon, Middlesex. Feb. 13, 1934, No. 4784. [Class 39 (i)] In an indirectly-heated cathode of the type in which the heating-filament is non- inductively wound to avoid hum the filament consists of two coaxial coils 1, 3 arranged one within the other and so proportioned that the resultant axial magnetic field at the emitting surface 8 is practically zero. The coils may be separated by an insulating tube 2 and the inner coil 1 may be of thicker wire than the outer. The electron emitting surface 8 may be carried on a tube 7 of refractory insulating material. Instead of the tube 2, the coils 1 and 3 may be coated with refractory insulating material.
GB478434A 1934-02-13 1934-02-13 Improvements in and relating to cathodes for thermionic valves Expired GB432733A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB478434A GB432733A (en) 1934-02-13 1934-02-13 Improvements in and relating to cathodes for thermionic valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB478434A GB432733A (en) 1934-02-13 1934-02-13 Improvements in and relating to cathodes for thermionic valves

Publications (1)

Publication Number Publication Date
GB432733A true GB432733A (en) 1935-08-01

Family

ID=9783743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB478434A Expired GB432733A (en) 1934-02-13 1934-02-13 Improvements in and relating to cathodes for thermionic valves

Country Status (1)

Country Link
GB (1) GB432733A (en)

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