GB421644A - Improvements in and relating to thermionic valves and to circuits therefor - Google Patents

Improvements in and relating to thermionic valves and to circuits therefor

Info

Publication number
GB421644A
GB421644A GB1774333A GB1774333A GB421644A GB 421644 A GB421644 A GB 421644A GB 1774333 A GB1774333 A GB 1774333A GB 1774333 A GB1774333 A GB 1774333A GB 421644 A GB421644 A GB 421644A
Authority
GB
United Kingdom
Prior art keywords
grid
anode
screen
cathode
control
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
GB1774333A
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 GB1774333A priority Critical patent/GB421644A/en
Publication of GB421644A publication Critical patent/GB421644A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/10—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between different pairs of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

421,644. Thermionic valves; valve circuits for wireless reception. ELECTRIC & MUSICAL INDUSTRIES, Ltd., Blyth Road, Hayes, Middlesex, and COOPER, A. H., Appledore, Syke Ings, Iver, Bucking- hamshire. June 21, 1933, No. 17743. [Classes 39 (i) and 40 (v)] A valve has an anode, a cathode, a control grid, a second or screen grid, and a third grid controlling the current to the second grid without affecting the current to the anode when the potential of the second grid is maintained constant. As shown in Fig. 1, the screen grid 4 and the indirectly-heated cathode 2 are longer than the control grid 3 and the anode 5, and the third grid 6 is arranged between the extended portions of the cathode and screen grid 4. A suppressor grid 8 may be mounted between screen grid 4 and the anode, and a grid 7 at a positive potential may be provided to prevent feed back from the screen grid 4 to the control grid 3. The control grid may be of the variable-mu type. The valve may be used in the superheterodyne receiving circuit shown in Fig. 2. The input circuit 11, 12 is connected between the control grid 3 and a variable bias which may provide automatic gain control. The grid 6 is connected through a leak resistance 15 to earth and through a condenser 16 with a tuned circuit 17, 18 coupled with a winding 19 in the circuit of the screen grid 4 to produce local oscillations. An anode circuit 20, 21, tuned to an intermediate frequency, is coupled to the input of an amplifier through an inductance 22. A biassing resistance 9, shunted by a condenser 10, is connected between the cathode and earth so as to give a small negative bias to the grid 6 and produce stability of the local oscillations.
GB1774333A 1933-06-21 1933-06-21 Improvements in and relating to thermionic valves and to circuits therefor Expired GB421644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1774333A GB421644A (en) 1933-06-21 1933-06-21 Improvements in and relating to thermionic valves and to circuits therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1774333A GB421644A (en) 1933-06-21 1933-06-21 Improvements in and relating to thermionic valves and to circuits therefor

Publications (1)

Publication Number Publication Date
GB421644A true GB421644A (en) 1934-12-21

Family

ID=10100450

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1774333A Expired GB421644A (en) 1933-06-21 1933-06-21 Improvements in and relating to thermionic valves and to circuits therefor

Country Status (1)

Country Link
GB (1) GB421644A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856521A (en) * 1954-10-18 1958-10-14 Philco Corp Autodyne frequency converter with self-bias controlled amplitude limiting and preclusion of grid current flow

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856521A (en) * 1954-10-18 1958-10-14 Philco Corp Autodyne frequency converter with self-bias controlled amplitude limiting and preclusion of grid current flow

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