GB721055A - Improvements in electronic direct-current amplifiers - Google Patents

Improvements in electronic direct-current amplifiers

Info

Publication number
GB721055A
GB721055A GB1473652A GB1473652A GB721055A GB 721055 A GB721055 A GB 721055A GB 1473652 A GB1473652 A GB 1473652A GB 1473652 A GB1473652 A GB 1473652A GB 721055 A GB721055 A GB 721055A
Authority
GB
United Kingdom
Prior art keywords
bridge
valve
resistance
amplifier
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
GB1473652A
Inventor
Robert Charles Langford
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.)
Sangamo Weston Ltd
Atos Origin IT Services Inc
Original Assignee
Sangamo Weston Ltd
Sangamo Weston Inc
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 Sangamo Weston Ltd, Sangamo Weston Inc filed Critical Sangamo Weston Ltd
Priority to GB1473652A priority Critical patent/GB721055A/en
Publication of GB721055A publication Critical patent/GB721055A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measuring Volume Flow (AREA)

Abstract

721,055. Valve amplifying circuits. SANGAMO WESTON, Ltd. Jan. 8, 1953 [June 11, 1952], No. 14736/52. Class 40 (6). A D.C. amplifier comprises a double bridge circuit, the first bridge, to which the input is applied, being a valve amplifier V1, V2, arranged to give a high voltage gain, while the second is an amplifier V3, V4, developing a low output impedance. In addition, a negative feed-back connection is provided between the two bridge circuits. Valves V1, V2 comprise pentodes with anode load resistances R3, R4 respectively, and a common cathode resistance R5, each screen being fed from the opposite anode. The input is applied to the grid of valve V1, via terminals T1, T2 which are shunted by a high resistance R6. The anodes of the valves V1, V2 are connected to the grids of the second pair V3, V4 which act as cathode followers; the second bridge is completed by cathode resistances R1, R2 and R7, R8 respectively, the output being taken from points F, H. A resistance R9 is introduced into one of the heater circuits in order to reduce zero drift by causing deliberate slight unbalance of the bridge, balance being effected by adjustment of resistance R1 which is made variable. As shown, the arrangement comprises a valve voltmeter, the output being connected to a meter M. Specifications 636,212 and 645,184 are referred to.
GB1473652A 1952-06-11 1952-06-11 Improvements in electronic direct-current amplifiers Expired GB721055A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1473652A GB721055A (en) 1952-06-11 1952-06-11 Improvements in electronic direct-current amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1473652A GB721055A (en) 1952-06-11 1952-06-11 Improvements in electronic direct-current amplifiers

Publications (1)

Publication Number Publication Date
GB721055A true GB721055A (en) 1954-12-29

Family

ID=10046571

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1473652A Expired GB721055A (en) 1952-06-11 1952-06-11 Improvements in electronic direct-current amplifiers

Country Status (1)

Country Link
GB (1) GB721055A (en)

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