GB676786A - Improvements relating to thermionic valve amplifiers - Google Patents

Improvements relating to thermionic valve amplifiers

Info

Publication number
GB676786A
GB676786A GB1844349A GB1844349A GB676786A GB 676786 A GB676786 A GB 676786A GB 1844349 A GB1844349 A GB 1844349A GB 1844349 A GB1844349 A GB 1844349A GB 676786 A GB676786 A GB 676786A
Authority
GB
United Kingdom
Prior art keywords
screen
potential
resistance
level
rectifier
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
GB1844349A
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.)
FARRANTI Ltd
NORMAN HALIFAX SEARBY
Original Assignee
FARRANTI Ltd
NORMAN HALIFAX SEARBY
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 FARRANTI Ltd, NORMAN HALIFAX SEARBY filed Critical FARRANTI Ltd
Priority to GB1844349A priority Critical patent/GB676786A/en
Publication of GB676786A publication Critical patent/GB676786A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/04—Limiting level dependent on strength of signal; Limiting level dependent on strength of carrier on which signal is modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)

Abstract

676,786. Limiters; interference suppression. FERRANTI, Ltd., and SEARBY, N. H. July 12, 1950 [July 13, 1949], No. 18443/49. Classes 40 (v) and 40 (vi). A screen-grid valve video or audio amplifier includes a rectifier 19 whereby the minimum value of the anode potential is limited to the D.C. potential of the screen. The screen potential is derived over series resistance 13, a shunt condenser 14 rendering the time - constant long so that the limiting level is determined by the signal level averaged over a period. The values of screen and anode resistance, 13, 12, respectively, are in such a ratio that the level at which the output is limited is approximately equal to the peak signal amplitude. Modified characteristics may be obtained by connecting a further resistance, Fig. 2 (not shown), between earth and one or other terminal of the rectifier.
GB1844349A 1949-07-13 1949-07-13 Improvements relating to thermionic valve amplifiers Expired GB676786A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1844349A GB676786A (en) 1949-07-13 1949-07-13 Improvements relating to thermionic valve amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1844349A GB676786A (en) 1949-07-13 1949-07-13 Improvements relating to thermionic valve amplifiers

Publications (1)

Publication Number Publication Date
GB676786A true GB676786A (en) 1952-08-06

Family

ID=10112517

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1844349A Expired GB676786A (en) 1949-07-13 1949-07-13 Improvements relating to thermionic valve amplifiers

Country Status (1)

Country Link
GB (1) GB676786A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2829247A (en) * 1954-08-02 1958-04-01 Rca Corp Television receiuver noise reduction
US2852623A (en) * 1956-01-03 1958-09-16 Hoffman Electronics Corp Versatile impulse noise limiter or the like
GB2446614A (en) * 2007-02-01 2008-08-20 Blackstar Amplification Ltd A valve audio power amplifier with desirable dynamic compression and harmonic distortion effects at reduced output power levels
EP2832443A2 (en) 2013-08-01 2015-02-04 The First Institute Of Oceanography Of State Oceanic Administration Method of preparing a filter element absorptive for Cs

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2829247A (en) * 1954-08-02 1958-04-01 Rca Corp Television receiuver noise reduction
US2852623A (en) * 1956-01-03 1958-09-16 Hoffman Electronics Corp Versatile impulse noise limiter or the like
GB2446614A (en) * 2007-02-01 2008-08-20 Blackstar Amplification Ltd A valve audio power amplifier with desirable dynamic compression and harmonic distortion effects at reduced output power levels
GB2446614B (en) * 2007-02-01 2011-06-15 Blackstar Amplification Ltd Audio amplifier
EP2832443A2 (en) 2013-08-01 2015-02-04 The First Institute Of Oceanography Of State Oceanic Administration Method of preparing a filter element absorptive for Cs

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