GB380499A - Improvements in or relating to thermionic amplifiers and control means for use in connection therewith - Google Patents

Improvements in or relating to thermionic amplifiers and control means for use in connection therewith

Info

Publication number
GB380499A
GB380499A GB1761431A GB1761431A GB380499A GB 380499 A GB380499 A GB 380499A GB 1761431 A GB1761431 A GB 1761431A GB 1761431 A GB1761431 A GB 1761431A GB 380499 A GB380499 A GB 380499A
Authority
GB
United Kingdom
Prior art keywords
cell
grid
resistance
valve
amplifier
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
GB1761431A
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph 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
Priority to BE389998D priority Critical patent/BE389998A/xx
Application filed by Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB1761431A priority patent/GB380499A/en
Publication of GB380499A publication Critical patent/GB380499A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/0005—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal
    • H03G1/0035—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements
    • H03G1/0047—Circuits characterised by the type of controlling devices operated by a controlling current or voltage signal using continuously variable impedance elements using photo-electric elements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/06—Manually-operated control in untuned amplifiers having discharge tubes

Landscapes

  • Control Of El Displays (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

380,499. Valve amplifying circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, and ROUND, H. J., Westfield, Muswell Hill, both in London. June 17,1931, No. 17614. [Class 40 (v).] The gain of a thermionic amplifier comprising a pentode valve is regulated by a control resistance in t h e screen-grid circuit, consisting wholly or in part of a photoelectric device activated by a controllable light source As shown in the Figure applied to an amplifier circuit similar to that described in Specification 378,950, a selenium cell S is connected in series with a resistance R3 across a supply battery B1. The junction of the cell S and the resistance R3 is connected to the screen-grid of the valve V1, so that the voltage on this grid, which determines the gain, is varied by varying the illumination of the cell S. For this purpose, a lamp EL may be used, and its brightness varied by a rheostat. When the amplifier is used for sound film reproduction, a volume-controlling record film may be traversed between the lamp EL and the cell S.
GB1761431A 1931-06-17 1931-06-17 Improvements in or relating to thermionic amplifiers and control means for use in connection therewith Expired GB380499A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE389998D BE389998A (en) 1931-06-17
GB1761431A GB380499A (en) 1931-06-17 1931-06-17 Improvements in or relating to thermionic amplifiers and control means for use in connection therewith

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1761431A GB380499A (en) 1931-06-17 1931-06-17 Improvements in or relating to thermionic amplifiers and control means for use in connection therewith

Publications (1)

Publication Number Publication Date
GB380499A true GB380499A (en) 1932-09-19

Family

ID=10098211

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1761431A Expired GB380499A (en) 1931-06-17 1931-06-17 Improvements in or relating to thermionic amplifiers and control means for use in connection therewith

Country Status (2)

Country Link
BE (1) BE389998A (en)
GB (1) GB380499A (en)

Also Published As

Publication number Publication date
BE389998A (en)

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