GB490347A - Improvements in or relating to amplifying systems - Google Patents

Improvements in or relating to amplifying systems

Info

Publication number
GB490347A
GB490347A GB546/38A GB54638A GB490347A GB 490347 A GB490347 A GB 490347A GB 546/38 A GB546/38 A GB 546/38A GB 54638 A GB54638 A GB 54638A GB 490347 A GB490347 A GB 490347A
Authority
GB
United Kingdom
Prior art keywords
impedance
frequency response
jan
primary winding
output transformer
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
GB546/38A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB490347A publication Critical patent/GB490347A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Abstract

490,347. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd. Jan. 7, 1938, No. 546. Convention date, Jan. 7, 1937. [Class 40 (v)] When the primary inductance of the output transformer of an amplifier is so low as to reduce low frequency response and the leakage inductance and secondary capacity so large as to reduce the high frequency response, an impedance is associated with the input circuit and a feedback path is provided by which a voltage proportional to that across the primary winding of the output transformer is fed in gain reducing phase to the impedance associated with the input which comprises capacitive reactance so that the frequency response is corrected. The Figure shows a feedback from the primary winding 15 through a resistance 24 to an impedance 13 in the input circuit. High frequency correction is effected by the network 26, 27. Resistances 14, 16 shunted by condensers 17, 18 are provided for grid biassing.
GB546/38A 1937-01-07 1938-01-07 Improvements in or relating to amplifying systems Expired GB490347A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US119374A US2162744A (en) 1937-01-07 1937-01-07 Amplifier

Publications (1)

Publication Number Publication Date
GB490347A true GB490347A (en) 1938-08-12

Family

ID=22384073

Family Applications (1)

Application Number Title Priority Date Filing Date
GB546/38A Expired GB490347A (en) 1937-01-07 1938-01-07 Improvements in or relating to amplifying systems

Country Status (3)

Country Link
US (1) US2162744A (en)
FR (1) FR831751A (en)
GB (1) GB490347A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746522C (en) * 1939-03-17 1944-08-03 Fernseh Gmbh Arrangement for reducing the disturbances (pipe noise, microphony, etc.) occurring in amplifiers, especially in the first amplifier stage, in amplifiers with negative feedback
US2647173A (en) * 1947-11-17 1953-07-28 Gen Electric Multiple feedback system
US3001148A (en) * 1958-01-09 1961-09-19 Marconi Wireless Telegraph Co Variable gain amplifiers

Also Published As

Publication number Publication date
US2162744A (en) 1939-06-20
FR831751A (en) 1938-09-14

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