GB647285A - D.c. amplifier - Google Patents

D.c. amplifier

Info

Publication number
GB647285A
GB647285A GB7880/48A GB788048A GB647285A GB 647285 A GB647285 A GB 647285A GB 7880/48 A GB7880/48 A GB 7880/48A GB 788048 A GB788048 A GB 788048A GB 647285 A GB647285 A GB 647285A
Authority
GB
United Kingdom
Prior art keywords
pentodes
amplifier
frequency
fed
coupled
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
GB7880/48A
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.)
Allen B du Mont Laboratories Inc
Original Assignee
Allen B du Mont Laboratories 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 Allen B du Mont Laboratories Inc filed Critical Allen B du Mont Laboratories Inc
Publication of GB647285A publication Critical patent/GB647285A/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
    • H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
    • H03F3/40—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with tubes only

Landscapes

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

Abstract

647,285. Valve amplifying and modulating circuits. DU MONT LABORATORIES, Inc., A. B. March 16, 1948, No. 7880. Convention date, May 8, 1947. Drawings to Specification. [Classes 40 (v) and 40 (vi)] An amplifier for low-amplitude signals of frequency from zero to 50 kc/s. comprises push-pull input pentodes adjustable to slight unbalance by a variable tapped common resistor between their screen grids, and D.C. coupled to cathode follower valves, feeding in push-pull two balanced modulator Class B pentodes with common tuned anode circuit to the grids of which a carrier frequency is fed in parallel. The output may then be fed to a pushpull D.C. amplifier and frequency changed if necessary and amplified before passing to a detector and D.C. coupled output stage. The percentage modulation of the carrier is controlled by the variable resistor. In a modification the cathode followers preceding the modulator pentodes are omitted.
GB7880/48A 1947-05-08 1948-03-16 D.c. amplifier Expired GB647285A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US746750A US2445938A (en) 1947-05-08 1947-05-08 Direct-current amplifier

Publications (1)

Publication Number Publication Date
GB647285A true GB647285A (en) 1950-12-13

Family

ID=25002176

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7880/48A Expired GB647285A (en) 1947-05-08 1948-03-16 D.c. amplifier

Country Status (2)

Country Link
US (1) US2445938A (en)
GB (1) GB647285A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519256A (en) * 1948-10-28 1950-08-15 Westinghouse Electric Corp High fidelity modulator
US2693578A (en) * 1952-01-09 1954-11-02 Western Electric Co Modulator system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977536A (en) * 1932-11-25 1934-10-16 Ernest A Tubbs Electrical system
US2076787A (en) * 1935-12-24 1937-04-13 Wired Radio Inc Variable carrier system
US2346020A (en) * 1942-02-05 1944-04-04 Rca Corp Modulation amplifier and modulator

Also Published As

Publication number Publication date
US2445938A (en) 1948-07-27

Similar Documents

Publication Publication Date Title
GB728327A (en) Improvements in or relating to modulated wave amplifiers
GB669455A (en) Arrangements for reducing distortion in electric signals
GB647285A (en) D.c. amplifier
GB583626A (en) Improvements in frequency modulation networks
US2239776A (en) Balanced modulator circuit
GB653548A (en) Improvements in and relating to feedback arrangements in symmetrical cathode follower circuits
GB596877A (en) Improvements in or relating to circuit arrangements for suppressing the carrier in amodulated carrier wave
GB590443A (en) Thermionic amplifier for coupling to balanced output circuits
GB615987A (en) Improvements in or relating to circuits for amplifying electrical oscillations
GB929025A (en) Improvements in or relating to signal transmission systems
GB781887A (en) Improvements in or relating to valve amplifier circuits for phase-amplitude characteristic correction
GB1389715A (en) Transistor amplifiers
GB658833A (en) Improvements relating to negative feedback amplifiers
GB619968A (en) Improvements relating to high frequency transmitting apparatus
GB1273956A (en) Microwave tube amplifier circuit for amplitude modulated and frequency modulated microwave signal
GB741782A (en) Improvements in or relating to devices for demodulating high-frequency signals
GB637549A (en) Improvements in tone control arrangements for audio frequency amplifiers
GB588479A (en) Improvements in and relating to receivers for frequency modulated electrical oscillations
GB1033016A (en) Improvements in or relating to radio frequency apparatus
GB586531A (en) Improvement in amplifier circuit
GB485854A (en) Improvements in or relating to thermionic amplifying systems
GB629954A (en) Improvements in circuit arrangements employing thermionic valves
GB666339A (en) Improvements in frequency divider and multiplier systems
GB681344A (en) Improvements relating to apparatus for reducing the distortion of an electronic amplifier
GB740871A (en) Improvements in or relating to radio transmitters operating with independent side bands