US2231867A - allen - Google Patents

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Publication number
US2231867A
US2231867A US2231867DA US2231867A US 2231867 A US2231867 A US 2231867A US 2231867D A US2231867D A US 2231867DA US 2231867 A US2231867 A US 2231867A
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US
United States
Prior art keywords
primary
transformer
loading
selectivity
allen
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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 - Lifetime
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English (en)
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Publication of US2231867A publication Critical patent/US2231867A/en
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    • 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
    • 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
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements

Definitions

  • the 25 f ectivity curve for the tuned ine frequency transformer indicated at ry oaded y voltage is cause by he sp e c ar e e ct, e m a 0 ting resist her y the se- 0 eioud ei ctro s u in e cat o e l "e '1S made T39m-topped
  • the CUYVG a 30 v t c th d nd varyi g m size selectivity ar t risti oi the with manges n mas the iiiae.
  • a variable gain band pass ampliiier stage comprising a transformer having a primary and a secondary, said primary and secondary being so tuned and coupled as to have a double peaked selectivity characteristic in the absence of loading on the transformer, an amplifier tube having a plurality of electrodes including input electrodes, means for coupling said secondary across said input electrodes, means for varying the direct current potential applied .to one of said electrodes whereby the gain of said amplifier stage may be controlled, and means for so resistively loading both said primary and said secondary that the selectivity characteristic of said tuned transformer is substantially flat-topped, said primary and said secondary being resistively loaded unlike amounts, the ratio of primary loading to secondary loading being such that said selectivity characteristic remains substantially nat-topped during changes in said direct current potential.
  • a variable gain band pass ampliiier stage comprising a transformer having a primary and a secondary, said primary and secondary being so tuned and coupled as to have a double peaked selectivity characteristic in the absence of loading on the transformer, an amplier tube havmg input electrodes, means for coupling said secondary across said input electrodes, means for varying the direct current potential between the input electrodes of said tube whereby the gain of said amplifier stage may be controlled, and means for so resistively loading both said primary and said secondary that the selectivity characteristic of said tuned transformer is substantially attopped, said primary and said secondary being resistively loaded unlike amounts, the ratio of primary loading to secondary loading being such that said selectivity characteristic remains substantially flat-topped during changes in said direct current potential.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US2231867D 1936-08-29 allen Expired - Lifetime US2231867A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US501211XA 1936-08-29 1936-08-29

Publications (1)

Publication Number Publication Date
US2231867A true US2231867A (en) 1941-02-18

Family

ID=21963483

Family Applications (1)

Application Number Title Priority Date Filing Date
US2231867D Expired - Lifetime US2231867A (en) 1936-08-29 allen

Country Status (4)

Country Link
US (1) US2231867A (en:Method)
BE (1) BE423304A (en:Method)
DE (1) DE685150C (en:Method)
GB (1) GB501211A (en:Method)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430983A (en) * 1939-07-24 1947-11-18 United Geophysical Company Inc Seismic amplifying system
US3231686A (en) * 1961-06-14 1966-01-25 Maico Electronics Inc Acoustic apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2430983A (en) * 1939-07-24 1947-11-18 United Geophysical Company Inc Seismic amplifying system
US3231686A (en) * 1961-06-14 1966-01-25 Maico Electronics Inc Acoustic apparatus

Also Published As

Publication number Publication date
DE685150C (de) 1939-12-13
GB501211A (en) 1939-02-23
BE423304A (en:Method)

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