GB651478A - Improvements in or relating to thermionic valve circuits for deriving two equal voltages of opposite phase - Google Patents

Improvements in or relating to thermionic valve circuits for deriving two equal voltages of opposite phase

Info

Publication number
GB651478A
GB651478A GB32420/47A GB3242047A GB651478A GB 651478 A GB651478 A GB 651478A GB 32420/47 A GB32420/47 A GB 32420/47A GB 3242047 A GB3242047 A GB 3242047A GB 651478 A GB651478 A GB 651478A
Authority
GB
United Kingdom
Prior art keywords
grid
anode
screen
circuit
input
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
GB32420/47A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB651478A publication Critical patent/GB651478A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

651,478. Valve amplifying circuits; automatic gain control. PHILIPS ELECTRICAL, Ltd. Dec. 9, 1947, No. 32420. Convention date, Sept. 13, 1946. [Classes 40 (v) and 40 (vi)] A circuit for deriving a push - pull output from a single-ended source comprises a hexode valve 1, with the input applied to the third grid, and the outputs taken from the anode and interconnected screen (second and fourth) grids respectively. The screen grid circuit includes an impedance 2 of such value that the anode current/first grid volts characteristic has a negative slope and a positive feed-back circuit 5, 3, 4 is provided between the anode and the first grid. A control voltage may be applied to the third grid, and a corresponding voltage of lower amplitude and opposite sign may be applied to the first grid. As shown, diodes 7, 8 are connected to give contrast expansion. A neutralizing condenser may be connected between the anode and third grid and negative feed-back may be provided between the anode and third grid and between the screen grids and the first grid, Fig. 3 (not shown). The screen circuit may include a frequency-sensitive impedance of such value that the anode current/input volts characteristic has zero slope for an undesired frequency. The input may be applied to the first grid.
GB32420/47A 1946-09-13 1947-12-09 Improvements in or relating to thermionic valve circuits for deriving two equal voltages of opposite phase Expired GB651478A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL265677X 1946-09-13

Publications (1)

Publication Number Publication Date
GB651478A true GB651478A (en) 1951-04-04

Family

ID=19781709

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32420/47A Expired GB651478A (en) 1946-09-13 1947-12-09 Improvements in or relating to thermionic valve circuits for deriving two equal voltages of opposite phase

Country Status (5)

Country Link
BE (1) BE478056A (en)
CH (1) CH265677A (en)
DE (1) DE808958C (en)
FR (1) FR955048A (en)
GB (1) GB651478A (en)

Also Published As

Publication number Publication date
BE478056A (en)
DE808958C (en) 1951-07-23
FR955048A (en) 1950-01-07
CH265677A (en) 1949-12-15

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