GB582618A - Improvements in thermionic valves - Google Patents

Improvements in thermionic valves

Info

Publication number
GB582618A
GB582618A GB951941A GB951941A GB582618A GB 582618 A GB582618 A GB 582618A GB 951941 A GB951941 A GB 951941A GB 951941 A GB951941 A GB 951941A GB 582618 A GB582618 A GB 582618A
Authority
GB
United Kingdom
Prior art keywords
wires
grid
parallel
filament
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
GB951941A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB951941A priority Critical patent/GB582618A/en
Publication of GB582618A publication Critical patent/GB582618A/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
    • 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
    • H01J2893/001—Non-constructive schematic arrangements

Landscapes

  • Electron Sources, Ion Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

582,618. Thermionic valves. STANDARD TELEPHONES & CABLES, Ltd., and MADDOCK, A. J. July 26, 1941, No. 9519. [Class 39 (i)] To reduce hum in a thermionic valve having a cathode heated by alternating current, the wires of the filament (or filamentary heater in an indirectly heated cathode) are arranged parallel or substantially parallel to the wires of the grid or grids. It is shown that the deflection of the electrons by the alternating magnetic field of the heating current takes place between the grid wires rather than across them, so that the grids do not collect hum components. Both control and screen grids may be parallel to the cathode, which may comprise four filaments F, Fig. 6, each between two grid wires G, and all parallel to the axis of cylindrical anode P. In Fig. 9, the filament F is a rectangular zig-zag, and the grid G is formed from parallel wires stretched between insulating plates Q, R ; a similar arrangement with a double hairpin filament substantially inclined to the grid wires is stated to be known. In a further modification, the filament and grid may both be coaxial helices, but this is disclaimed for indirectly heated cathodes. The wires may be replaced by strips or tapes and either across or parallel to the electron stream. Specification 301,514, [Class 39 (i)], is referred to.
GB951941A 1941-07-26 1941-07-26 Improvements in thermionic valves Expired GB582618A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB951941A GB582618A (en) 1941-07-26 1941-07-26 Improvements in thermionic valves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB951941A GB582618A (en) 1941-07-26 1941-07-26 Improvements in thermionic valves

Publications (1)

Publication Number Publication Date
GB582618A true GB582618A (en) 1946-11-22

Family

ID=9873536

Family Applications (1)

Application Number Title Priority Date Filing Date
GB951941A Expired GB582618A (en) 1941-07-26 1941-07-26 Improvements in thermionic valves

Country Status (1)

Country Link
GB (1) GB582618A (en)

Similar Documents

Publication Publication Date Title
US1618499A (en) Electrical apparatus
GB582618A (en) Improvements in thermionic valves
US2535307A (en) Grid-controlled electron tube
GB629881A (en) Improvements in electric discharge tubes comprising secondary emission electrodes
USRE18367E (en) ruben
GB588186A (en) Improvements in vacuum or low-pressure electric discharge apparatus
US2254793A (en) Grid controlled tube with electron multiplier
USRE20602E (en) Vacctjm tube
US1859522A (en) Electron tube
US1982068A (en) Combined rectifier and pentode
GB435933A (en) Improvements in and relating to electron discharge devices
GB555478A (en) Improved amplifying valve for high frequencies
GB602228A (en) Improvements in or relating to devices comprising electric discharge tubes
GB829339A (en) Improvements in or relating to equipotential cathodes for electric discharge tubes and discharge tubes containing such cathodes
US1937594A (en) Vacuum tube
US2051396A (en) Electrical circuit
GB556427A (en) Improvements in vacuum electron-discharge tubes
GB423796A (en) Improvements in thermionic discharge devices
GB498703A (en) Improvements in secondary emission electron multipliers
GB655594A (en) Improvements in or relating to electron discharge tubes
GB642600A (en) Improvements in or relating to electron discharge apparatus
GB607058A (en) Improvements in or relating to electrical space discharge tubes
GB712886A (en) Improvements in or relating to electric discharge tubes
GB482454A (en) Improvements in or relating to electron multipliers
GB247440A (en) Vacuum tube arrangement