US2156659A - Amplifier device - Google Patents

Amplifier device Download PDF

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Publication number
US2156659A
US2156659A US85648A US8564836A US2156659A US 2156659 A US2156659 A US 2156659A US 85648 A US85648 A US 85648A US 8564836 A US8564836 A US 8564836A US 2156659 A US2156659 A US 2156659A
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United States
Prior art keywords
tubes
plate
tube
current
alternating
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 - Lifetime
Application number
US85648A
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English (en)
Inventor
Urtel Rudolf
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2156659A publication Critical patent/US2156659A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/22—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only

Definitions

  • This invention relates to a circuit arrangement for amplifier tubes in which the plate currents of two tubes fiow through a joint external impedance or resistance in opposite directions.
  • a further object of the invention is to provide 5 an amplifier device consisting of two electron discharge tubes in which substantially no direct current flows through the load or output circuit but in which the alternating potentials produced by the separate tubes are added together.
  • Figs. 1 and 2 are schematic circuit diagrams of amplifiers embodying the invention.
  • I and II denote two amplifier tubes whose grids are connected with the secondary windings I2 and I3 of a transformer I4.
  • the primary winding I5 of the said transformer is fed with the alternating potential to be amplified.
  • the external impedance I8 which may consist of the primary winding of an output transformer I9 or else consist directly of the consumer or load to be supplied with current, is connected in parallel to each of the two tubes.
  • FIG. 1 An examination of Fig. 1 will showthat the plate currents of the two tubes traverse the external resistance I8 in contrary directions seeing that the electron current of tube I0 flows from top to bottom, and that of tube II from below in an upward direction, across the external impedance I8.
  • the secondary windings I2, I3, of transformer I4 are associated with the grids of both tubes in such manner that these two grids are operated in phase opposition (push-pull)
  • a potential of the alternation in question of a negative sense will arise so that the plate current of this tube is diminished.
  • the plate direct currents of the tubes are subtracted from each other, whereas the alternating plate potentials are added. It will be most advantageous to use two tubes having like characteristics, and to operate the tubes about the middles of their characteristics. The direct plate currents will then be completely balanced out.
  • plate circuit of tube I0 contains in addition a resistance 20 the left-hand end of which is united with the grid of tube II.
  • the alternating voltage to be amplified is fed only to the grid of tube Ill.
  • this circuit organization operates with potentials in phase opposition at the two grids of the tubes inasmuch as the plate alternating current of tube III which, as known, is in phase opposition to the grid alternating potential of tube I0, forms at the same time the grid alternating voltage for the tube II.
  • the direct plate currents act in opposition in the external impedance I 8 so much so that, under certain circumstances, they will totally neutralize each other, whereas the alternating plate currents become added.
  • the new circuit arrangements hereinbefore disclosed have the property that they may be fed with a single-phase alternating potential, and that they will furnish an amplified single-phase current in spite of the fact that the amplification is brought about in two tubes. It is this fact that distinguishes the present scheme advantageously from the conventional types of push-pull amplifier arrangement.
  • the new circuits here disclosed are particularly suited for the amplification of saw-tooth currents fed to the deflector coils of Braun or cathoderay tubes. It will be noted that in the case of curve-shapes of the said sort all frequencies as may be contained in the saw-tooth curve form must be amplified with fidelity (without distortion) both as regards amplitude and phase, a task which is attainable by other ways and means only at considerable cost.
  • an amplifying device the combination of two electron discharge tubes each having a cathode, a control grid and a plate, a conductor directly connecting the cathode of the first of said tubes to the plate of the second tube, a source of positive potential connected between the cathode of the second tube and the plate of the first tube, an output circuit connecting said directly connecting conductor to an intermediate point of said potential source, and an input transformer having a pair of secondary windings, each of which is connected between the control grid and cathode of one of said tubes, said windings causing the voltage of said control grids to vary in substantially opposite phase.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US85648A 1935-04-01 1936-06-17 Amplifier device Expired - Lifetime US2156659A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2156659X 1935-04-01

Publications (1)

Publication Number Publication Date
US2156659A true US2156659A (en) 1939-05-02

Family

ID=7987702

Family Applications (1)

Application Number Title Priority Date Filing Date
US85648A Expired - Lifetime US2156659A (en) 1935-04-01 1936-06-17 Amplifier device

Country Status (2)

Country Link
US (1) US2156659A (fr)
FR (1) FR803838A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100815A (en) * 1959-04-29 1963-08-13 Newspaper Entpr Ass Inc Apparatus for producing color separation negatives and the like

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973683C (de) * 1952-09-09 1960-04-28 Jan Friedrich Dr-Ing Toennies Verstaerkerroehrenanordnung in Kathodenfolgeschaltung
NL91579C (fr) * 1955-04-16
US3109122A (en) * 1960-04-25 1963-10-29 Ncr Co Deflection amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3100815A (en) * 1959-04-29 1963-08-13 Newspaper Entpr Ass Inc Apparatus for producing color separation negatives and the like

Also Published As

Publication number Publication date
FR803838A (fr) 1936-10-09

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