GB467430A - Improvements in or relating to thermionic amplifiers - Google Patents

Improvements in or relating to thermionic amplifiers

Info

Publication number
GB467430A
GB467430A GB34882/35A GB3488235A GB467430A GB 467430 A GB467430 A GB 467430A GB 34882/35 A GB34882/35 A GB 34882/35A GB 3488235 A GB3488235 A GB 3488235A GB 467430 A GB467430 A GB 467430A
Authority
GB
United Kingdom
Prior art keywords
diode
valve
potential
cathode
resistance
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
GB34882/35A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB34882/35A priority Critical patent/GB467430A/en
Priority to US115913A priority patent/US2224699A/en
Publication of GB467430A publication Critical patent/GB467430A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/04—Manually-operated control in untuned amplifiers
    • H03G3/06—Manually-operated control in untuned amplifiers having discharge tubes
    • H03G3/08—Manually-operated control in untuned amplifiers having discharge tubes incorporating negative feedback
    • 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
    • H03G1/00—Details of arrangements for controlling amplification
    • H03G1/04—Modifications of control circuit to reduce distortion caused by control

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Pens And Brushes (AREA)
  • Amplifiers (AREA)

Abstract

467,430. Valve circuits for wireless reception. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and RUST, N. M. Dec. 16, 1935, No. 34882. [Class 40 (v)] A.V.C. is effected by varying the value of a feed-back impedance in the cathode circuit of a valve or valves whose gain is to be controlled. In one embodiment, Fig. 11, shown in simplified form in Fig. 2, a tuned amplifier comprises three valves V1, V2, V3 the cathodes of valves V1, V3 being connected together and to a variable cathode feed-back impedance CR, Fig. 2, constituted by a diode D, Fig. 11, the resistance of which is controlled by a potential dependant upon signal strength derived from a gain control line A.V.C. through a filter AVR, SC1, SC2. The diode D is shunted by a grid biasing resistance BR1 in series with a shunt combination of inductance resistance and capacity CR3. The positive A.V.C. potential on the diode anode is derived from the cathode of a valve to which increasingly negative grid bias is applied as signal amplitude increases, Fig. 12 (not shown). The diode D may be incorporated in valve V3 as indicated in dotted lines. In a second embodiment, Fig. 13, shown in simplified form in Fig. 4, two variable impedances are used constituted by a diode 1D shunted by a resistance DR connected between the cathode of valve V3 and the grid of the preceding valve V2, and a diode 2D in the cathode circuit of valve V3. A potential from the line A.V.C. which becomes increasingly positive with increase in signal amplitude is applied to the cathode of valve V1, and from a tapping TCR on a potential divider CR1 to the cathodes of valves V2, V3. The diode 2D is shunted by a tuned circuit ATC3 and its anode returned to a point T2 of fixed positive potential so that its resistance increases as its cathode rises in potential, while the resistance of diode 1D decreases as its anode rises in potential. The A.V.C. potential may be derived from the cathode of an anode-bend detector, Fig. 14 (not shown). Simplified circuits with variable feed back impedances connected in other positions are also described. Electron-beam valves of the type described for example in Specification 403,973 are preferably employed.
GB34882/35A 1935-12-16 1935-12-16 Improvements in or relating to thermionic amplifiers Expired GB467430A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB34882/35A GB467430A (en) 1935-12-16 1935-12-16 Improvements in or relating to thermionic amplifiers
US115913A US2224699A (en) 1935-12-16 1936-12-15 Thermionic amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB34882/35A GB467430A (en) 1935-12-16 1935-12-16 Improvements in or relating to thermionic amplifiers

Publications (1)

Publication Number Publication Date
GB467430A true GB467430A (en) 1937-06-16

Family

ID=10371076

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34882/35A Expired GB467430A (en) 1935-12-16 1935-12-16 Improvements in or relating to thermionic amplifiers

Country Status (2)

Country Link
US (1) US2224699A (en)
GB (1) GB467430A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE830360C (en) * 1943-03-03 1952-02-04 Philips Nv Circuit for the amplification of high-frequency or intermediate-frequency signals
DE849860C (en) * 1937-09-15 1952-09-18 Telefunken Gmbh Receiver with a shrinkage control acting in the high and low frequency parts
DE951278C (en) * 1938-07-26 1956-10-25 Aeg Low frequency amplifier with volume control and negative feedback, especially for radio receivers

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470219A (en) * 1944-03-07 1949-05-17 Sylvania Electric Prod Linear response vacuum tube voltmeter
US2536617A (en) * 1945-02-27 1951-01-02 Barton L Weller Direct current negative feedback amplifier
US2462190A (en) * 1945-03-15 1949-02-22 Westinghouse Electric Corp Amplifier for small direct currents
NL83154C (en) * 1950-01-11
US2717931A (en) * 1950-07-29 1955-09-13 Rca Corp Circuit for varying amplifier gain and frequency response with signal amplitude
US2892042A (en) * 1953-12-15 1959-06-23 Siemens Ag Amplification regulation in multistage amplifier apparatus
US2890336A (en) * 1953-12-31 1959-06-09 Standard Oil Co Adjustable feedback system
US3045426A (en) * 1955-06-21 1962-07-24 United Aircraft Corp Control system having an amplifier with variable sensitivity
US2949605A (en) * 1955-09-12 1960-08-16 Motorola Inc Portable color television system
US3017749A (en) * 1957-06-10 1962-01-23 Heppler Herbert Temperature responsive gas turbine fuel control with multi-rate feedback
US3001148A (en) * 1958-01-09 1961-09-19 Marconi Wireless Telegraph Co Variable gain amplifiers
US3155917A (en) * 1959-05-07 1964-11-03 Honeywell Inc Electronic apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE849860C (en) * 1937-09-15 1952-09-18 Telefunken Gmbh Receiver with a shrinkage control acting in the high and low frequency parts
DE951278C (en) * 1938-07-26 1956-10-25 Aeg Low frequency amplifier with volume control and negative feedback, especially for radio receivers
DE830360C (en) * 1943-03-03 1952-02-04 Philips Nv Circuit for the amplification of high-frequency or intermediate-frequency signals

Also Published As

Publication number Publication date
US2224699A (en) 1940-12-10

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