GB423932A - Improvements in and relating to thermionic valves - Google Patents

Improvements in and relating to thermionic valves

Info

Publication number
GB423932A
GB423932A GB2165333A GB2165333A GB423932A GB 423932 A GB423932 A GB 423932A GB 2165333 A GB2165333 A GB 2165333A GB 2165333 A GB2165333 A GB 2165333A GB 423932 A GB423932 A GB 423932A
Authority
GB
United Kingdom
Prior art keywords
anode
grid
auxiliary electrode
cathode
screen
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
GB2165333A
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB2165333A priority Critical patent/GB423932A/en
Publication of GB423932A publication Critical patent/GB423932A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/02Electron-emitting electrodes; Cathodes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00Discharge tubes and lamps
    • H01J2893/0001Electrodes and electrode systems suitable for discharge tubes or lamps

Landscapes

  • Cell Electrode Carriers And Collectors (AREA)

Abstract

423,932. Discharge apparatus. ELECTRIC & MUSICAL INDUSTRIES, Ltd., Blyth Road, Hayes, Middlesex, SHOENBERG, 1., 202, Willesden Lane, Kilburn, London, BULL, C. S., 33, Micawber Avenue, Hillingdon, and RODDA, S., 15, Osterley Park Road, Southall, both in Middlesex. Aug. 2, 1933, Nos. 21653 /33, 21654 /33, 21655 /33, and 13169 /34. [Class 39 (i)] A screen-grid tube has an auxiliary electrode located at least mainly clear of the path of the electron stream and adapted when maintained at a low potential to modify the field in the space between the anode and the screening electrode so that with the control grid and auxiliary electrode at cathode potential and the screen grid at a positive potential equal to the mean anode potential the anode voltageanode current characteristic exhibits no inflexion. In one form, Fig. 1, a rectangular cathode a is surrounded by control grids b and screen grids c spaced from each other and from the cathode above and below by insulating strips k. The auxiliary electrode consists of a box-like structure e having internal fins l and portions u in the place of the anodes d. The distance between the anode and the screening grid should not be less than twice the pitch of the screen grid. In a modification, the auxiliary electrode is continued round the back of the anodes d and the portions z are omitted, being replaced by screens connected to the screening grid. In another modification, the fins l are omitted. In another form, Fig. 8, the cathode a is surrounded by control grid b, screen grid c and a two part anode d, the parts being separated by a two-part auxiliary electrode l which is connected to the cathode or furnished with an external lead. Metal or insulating shields t prevent secondary electrons from reaching the screen grid in the shadow of the supports s. The anode and auxiliary electrode may consist each of more than two parts and may be secured to upper and lower mica sheets, into which the grid posts fit, by bent-over lugs. In a modification, cylindrical anode members alternate with cylindrical auxiliary electrode members along the length of the cathode. In another modification the auxiliary electrode e consists of extensions of the screens t. As shown in Fig. 18, an anode d may be supported from auxiliary electrode parts e by an insulating bar x engaged by a bar w fixed to the anode d and clamped by tongues v<1>, v<2> struck out of the electrodes e<1>, e<2>. In a modification the anode d is riveted to a thin bar x. The arrangement shown in Fig. 1 may be modified by omitting the side portions z and by substituting for the fins l rectangular apertured sheets which are spaced from the screen grid c by insulating spacers. The grid posts are then secured to upper and lower mica sheets to which the anodes are secured by bentover tongues. The auxiliary electrodes are tied together by welded straps. The anodes and control grids may be connected together or brought out separately if push-pull amplification is desired.
GB2165333A 1933-08-02 1933-08-02 Improvements in and relating to thermionic valves Expired GB423932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2165333A GB423932A (en) 1933-08-02 1933-08-02 Improvements in and relating to thermionic valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2165333A GB423932A (en) 1933-08-02 1933-08-02 Improvements in and relating to thermionic valves

Publications (1)

Publication Number Publication Date
GB423932A true GB423932A (en) 1935-02-04

Family

ID=10166543

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2165333A Expired GB423932A (en) 1933-08-02 1933-08-02 Improvements in and relating to thermionic valves

Country Status (1)

Country Link
GB (1) GB423932A (en)

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