GB672256A - Improved electronic valve amplifiers - Google Patents

Improved electronic valve amplifiers

Info

Publication number
GB672256A
GB672256A GB1541549A GB1541549A GB672256A GB 672256 A GB672256 A GB 672256A GB 1541549 A GB1541549 A GB 1541549A GB 1541549 A GB1541549 A GB 1541549A GB 672256 A GB672256 A GB 672256A
Authority
GB
United Kingdom
Prior art keywords
stage
valve
anode
anodes
push
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
GB1541549A
Inventor
Edward Albert Henry Bowsher
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.)
Communications Patents Ltd
Original Assignee
Communications Patents 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 Communications Patents Ltd filed Critical Communications Patents Ltd
Priority to GB1541549A priority Critical patent/GB672256A/en
Publication of GB672256A publication Critical patent/GB672256A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/34—DC amplifiers in which all stages are DC-coupled
    • H03F3/36—DC amplifiers in which all stages are DC-coupled with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
    • 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

Landscapes

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

Abstract

672,256. Valve amplifying circuits. COMMUNICATIONS PATENTS, Ltd. June 8, 1950 [June 9, 1949], No. 15415/49. Class 40 (vi). In a push-pull amplifier two or more stages which are similarly phased in respect of in-phase voltage variations are connected in series across the H.T. supply, so that negative feed-back occurs in respect of in-phase signals: As applied to a three-stage amplifier the first stage, comprising a double-triode 4 provided with anode load resistances 13, 14, is connected in series with the third stage which also comprises a double triode, 6. Unbalanced signals are applied via terminals 10 to one grid of the valve 4, the other grid being earthed and a balanced output being obtained by means of a common cathode resistance 12. The anodes of the valve 4 are directly connected to the grids of the second stage, which comprises a further doubletriode 5 with a common cathode resistance 19 and anode loads 20, 21. The final stage 6 is also provided with a common cathode resistance 15 and the grids are directly connected to the anodes of the valve 5; anode load resistances 16, 17 are provided, a push-pull output being obtained at the terminals 18. Additional negative feed-back may be obtained by connection of one or other anode of the stage 6 to the corresponding grid of the stage 4, via resistances 25, 27 and D.C. blocking condensers 26, 28. The arrangement is balanced by means of an adjustable potentiometer 11 connected between the cathodes of the valve 4; the state of balance is indicated by a centre-zero meter 22 which may be connected between the anodes of the valve 6. In a modification, Fig. 2 (not shown), the first stage of the amplifier comprises a pair of pentodes and balance is adjusted by means of a potentiometer connected between the screens of the valves, and whose slider is connected to a further potentiometer across the H.T. supply whereby the total current may be adjusted. In this embodiment the output stage works into a push-pull transformer arranged in its cathode circuit and requires an anode current exceeding that of the preceding valves in the series chain, the excess current being by-passed over a resistance which is connected to a tap on the H.T. supply.
GB1541549A 1949-06-09 1949-06-09 Improved electronic valve amplifiers Expired GB672256A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1541549A GB672256A (en) 1949-06-09 1949-06-09 Improved electronic valve amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1541549A GB672256A (en) 1949-06-09 1949-06-09 Improved electronic valve amplifiers

Publications (1)

Publication Number Publication Date
GB672256A true GB672256A (en) 1952-05-21

Family

ID=10058733

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1541549A Expired GB672256A (en) 1949-06-09 1949-06-09 Improved electronic valve amplifiers

Country Status (1)

Country Link
GB (1) GB672256A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1150119B (en) * 1959-05-19 1963-06-12 Bernhard Philberth Multi-stage tube or transistor amplifier with at least three stages, containing stages through which the operating current flows essentially one after the other
US3210683A (en) * 1961-01-13 1965-10-05 Marconi Co Ltd Variable gain circuit arrangements
WO2004064249A2 (en) * 2003-01-08 2004-07-29 Bretza, Ltd. Cathode-coupled pentode valve amplifier with servo offset controlled push-pull output stage

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1150119B (en) * 1959-05-19 1963-06-12 Bernhard Philberth Multi-stage tube or transistor amplifier with at least three stages, containing stages through which the operating current flows essentially one after the other
US3210683A (en) * 1961-01-13 1965-10-05 Marconi Co Ltd Variable gain circuit arrangements
WO2004064249A2 (en) * 2003-01-08 2004-07-29 Bretza, Ltd. Cathode-coupled pentode valve amplifier with servo offset controlled push-pull output stage
WO2004064249A3 (en) * 2003-01-08 2004-12-29 Bretza Ltd Cathode-coupled pentode valve amplifier with servo offset controlled push-pull output stage

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