GB485854A - Improvements in or relating to thermionic amplifying systems - Google Patents

Improvements in or relating to thermionic amplifying systems

Info

Publication number
GB485854A
GB485854A GB2606736A GB2606736A GB485854A GB 485854 A GB485854 A GB 485854A GB 2606736 A GB2606736 A GB 2606736A GB 2606736 A GB2606736 A GB 2606736A GB 485854 A GB485854 A GB 485854A
Authority
GB
United Kingdom
Prior art keywords
impedance
triode
valve
amplifier
feed
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
GB2606736A
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
Priority to BE423459D priority Critical patent/BE423459A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2606736A priority patent/GB485854A/en
Priority to NL48810D priority patent/NL48810C/xx
Publication of GB485854A publication Critical patent/GB485854A/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
    • 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

485,854. Valve circuits for wireless reception. STANDARD TELEPHONES & CABLES, Ltd., BLACK, D. H., and LAWRENCE, W. Sept. 25, 1936, No. 26067. [Class 40 (v)] A.V.C. in a thermionic amplifier is produced by applying a gain control potential to the grid of a valve the internal impedance of which is common to the output and input circuits of the amplifier and produces a negative feed-back effect. In one embodiment, Fig. 1, feed-back voltages are derived from the junction of a resistance R and the triode portion of a double valve V1, which are connected across the pentode amplifying portion, the impedance of the triode being varied by an A.V.C. voltage applied to its grid. In another embodiment, Fig. 3, a triode V2 forms part of the common cathode impedance of an amplifier valve V1, and is shunted by an inductance L of high impedance to radio signals but of low impedance to the steady bias potential developed across resistance R. In a modification, Fig. 4 (not shown), the " oscillator " portion of a heptode is used as the feed-back triode in the " cathode " circuit of the signal amplifying portion. The amount of negative feed-back in a low-frequency amplifier may be simultaneously controlled. Specification 467,430 is referred to.
GB2606736A 1936-09-25 1936-09-25 Improvements in or relating to thermionic amplifying systems Expired GB485854A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE423459D BE423459A (en) 1936-09-25
GB2606736A GB485854A (en) 1936-09-25 1936-09-25 Improvements in or relating to thermionic amplifying systems
NL48810D NL48810C (en) 1936-09-25 1937-09-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2606736A GB485854A (en) 1936-09-25 1936-09-25 Improvements in or relating to thermionic amplifying systems

Publications (1)

Publication Number Publication Date
GB485854A true GB485854A (en) 1938-05-25

Family

ID=10237845

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2606736A Expired GB485854A (en) 1936-09-25 1936-09-25 Improvements in or relating to thermionic amplifying systems

Country Status (3)

Country Link
BE (1) BE423459A (en)
GB (1) GB485854A (en)
NL (1) NL48810C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610260A (en) * 1946-12-31 1952-09-09 Rca Corp Signal gain control circuits
US2739189A (en) * 1950-07-12 1956-03-20 Rca Corp Grounded grid u. h. f. amplifier with gain control and constant input impedance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2610260A (en) * 1946-12-31 1952-09-09 Rca Corp Signal gain control circuits
US2739189A (en) * 1950-07-12 1956-03-20 Rca Corp Grounded grid u. h. f. amplifier with gain control and constant input impedance

Also Published As

Publication number Publication date
NL48810C (en) 1940-02-15
BE423459A (en)

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