US1959540A - Method and means for increasing the power output of a thermionic tube - Google Patents

Method and means for increasing the power output of a thermionic tube Download PDF

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Publication number
US1959540A
US1959540A US394172A US39417229A US1959540A US 1959540 A US1959540 A US 1959540A US 394172 A US394172 A US 394172A US 39417229 A US39417229 A US 39417229A US 1959540 A US1959540 A US 1959540A
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US
United States
Prior art keywords
grid
tube
cathode
potential
amplifying
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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
Application number
US394172A
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English (en)
Inventor
Fred B Maclaren
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REVELATION PATENTS HOLDING Co
REVELATION PATENTS HOLDING COM
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REVELATION PATENTS HOLDING COM
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
Priority to NL33740D priority Critical patent/NL33740C/xx
Application filed by REVELATION PATENTS HOLDING COM filed Critical REVELATION PATENTS HOLDING COM
Priority to US394172A priority patent/US1959540A/en
Priority to GB26616/30A priority patent/GB362504A/en
Priority to FR703420D priority patent/FR703420A/fr
Application granted granted Critical
Publication of US1959540A publication Critical patent/US1959540A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
    • H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic 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
    • H03F3/50—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower
    • H03F3/52—Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower with tubes only

Definitions

  • the grid will respond accurately to the negative side of the wave and produce true amplification in the plate circuit of the tube but the positive side of the wave will cause grid current to flow between the grid and the cathode and the potential drop in the secondary of the transformer will prevent the grid potential varying in accordance with the incoming signal. This results in a distortion of the output current, half the wave coming through accurately andthe other half being distorted so that the signals produced are muddy and indistinct even though the volume is sufiicient for perfect hearing under proper conditions.
  • One of the objects of the present invention is to provide a means for increasing the range of Ypower output of a thermionic tube.
  • Another object of the invention is to provide a method and a means for compensating for the ordinary distortion produced when the grid of an amplifying tube ispositive so that the grid may swing either negative or positive and still produce true amplification at the output of the tube.
  • Another object of the invention is to provide an input circuit for an audio frequency thermionic tube which will not have a potential drop therein to cause distortion.
  • Fig. 1 is a circuit diagram illustrating the invention
  • v sov Fig. 2 is a graphic representation of the plate I current characteristics of a thermionic amplier tube.
  • FIG. 1 is shown an input transformer 10 having a primary winding 11 connected to a source of input cmrent and a secondary winding 12, and an output transformer 13 having a primary winding 14 and a secondary winding 15, these transformers being the ordinary transformers used in an ordinary amplification systern.
  • the primary 14 of the output transformer is connected at one end directly to a plate 16 of a thermionic amplifying tube 17 while the other end of the primary 14 is connected to the positive terminal of a B battery 18 whose negative terminal is connected to a lead 19 which is connected in turn to the cathode 20 of the tube 17, these connections following the usual connectlons for an amplifier tube.
  • This compensating tube 22 may be exactly lI ke the amplifying tube 17 and having a grid 23 which I connect to one endA of the secondary 12 of the input transformer 10 while the other end of this secondary is connected to the lead 19 and therefore to the cathode 20 of the amplifying tube 17 and also to the negative side of the B battery 18.
  • the cathode 24 of this compensating tube I connect directly to the grid 21 of the amplifying tube 17 by means of the lead 241, while the plate 25 is connected to a point on the B battery having a positive potential.
  • 26 may be connected across the terminals of the' battery 18 and 'a second by-pass condenser 27 may be connected if desired between the negative terminal of the battery and the connection with the plate 25 of the tube 22.
  • FIG. 2 of the drawing shows a plate current characteristic curve for a vacuum tube with grid voltage plotted on the horizontal line and plate current in milliamperes plotted on the vertical line. Before my invention it has been the custom to selecta point A on the characteristic curve where A by-pass condenser.
  • the grid voltage is negative to prevent the positive side of the incomingsignal wave bringing the grid beyond the zero grid voltage point and is between B and C as indicated on the curve.
  • the characteristic curve however continues in a straight line beyond the zero grid voltage point so that the capabilities of -the vacuum tube are considerably greater as to its power output than has been heretofore used as indicated by the limits B and C. "With my invention the midpoint of the grid potential swing, instead of beinglat A. may be at the zero point or on the positive side as at A' where it appears to come due to the operation of the compensating tube and the swing i of the grid is now not limited to the negative side of the curve but it is free'to swing on both sides making undistorted amplification possible when the grid swings between the points B on the negative and C' on the positive side of the curve.
  • a thermionic vacuum tube In an audio frequency amplifying system a thermionic vacuum tube, an input circuit for said tube, a transformer secondary coil included in said input circuit, and means to by-pass any current owing in said circuit around said transformer coil, the last mentioned means including another thermionic vacuum tube having its cathode conductively connected to the grid of the first mentioned tube, and circuit arrangements for imparting a positive bias to the grid of the first tube and a negative bias to the grid of the second tube.
  • a thermionic amplifying tube in an audio frequency amplifying system a thermionic amplifying tube, a grid in said tube, an input circuit connected to said grid, and means connected to said input circuit to prevent a distortion of theamplification of said tubewhen said grid swings to a positive potential
  • the last mentioned means including a compensating tube having its anode directly connected to a source of positive potential and its cathode directly connected to the grid of the said amplifying tube, and circuit connections including said source of potential tending to bias the grid of said amplifying tube positively and the grid of said.
  • an output transformer a primary winding on said' output transformer, a connection between one end of said primary winding and the plate of said second thermionic tube, a connectionbetween the other end of said primary winding and a source of positive potential, and a connection between the plate of said first thermionic tube and a source of positive potential.
  • each cathode is provided with an associated anode, and said potential source serves as the operating potential for said anodes.
  • An amplifying system comprising a first electron emitting cathode and a control grid therefor; a second electron emitting cathode and a control grid therefor; an anode for the first cathode: an anode for the second cathode; a connection between the first cathode and the second grid; a series circuit including in sequence the positive terminal of a source of potential, the first mentioned anode, the first mentioned cathode, the second mentioned grid, the second mentioned cathode, the negative pole of said source; and a connection from the said negative pole to the first grid whereby said first grid is negatively biased with respect to the first cathode.
  • An amplifying system comprising a first cathode, a first grid, a second cathode, a second grid, means for connecting the respective grid cathode spaces in series, said means including an input impedance, and circuit connections and a source of steady potential for simultaneously imparting some positive bias to the second grid and some negative bias to the first grid, substantially independently of the signal variations.
  • An amplifying system comprising a rst electron emitting cathode and a control grid as'- sociated therewith, a second electron emitting .cathode and a control grid associated therewith,
  • the first mentioned grid being somewhat negatively biased with respect to its cathode substan- 10.
  • an input circuit for said triode comprising a compensating triode, a connection from the cathode of said amplifying triode to the negative terminal of the anode supply, a connection of substantially zero impedance from the grid of said amplifying triode to the cathode of said compensating triode, a connection of substantially zero impedance from the anode of said compensating triode to a positive terminal of the anode supply, whereby said anode supply tends to bias the grid of the compensating triode negatively, and the grid of the amplifying triode positively.
  • a system of the character described comprising a first triode, a second triode, the ⁇ anodecathode space of the second. triode being connected across the grid-cathode of the first triode to form part of the input impedance of the said first triode, and circuit connections tending to bias the grid of the first triode positively and the grid of the second triode negatively.
  • a system of the character described comprising an amplifying triode, a compensating triode, a source of anode potential for both triodes, a connection of substantially zero impedance from the anode of the compensating triode to a positive terminal of said potential source, a connection of substantially zero impedance from the cathode of the compensating triode to the grid of the amplifying triode, means for impressing the signals to be amplified on the grid of the compensating triode, and circuit connections for causing the signal Variations on the grid of said compensating triode to be in substantially the same phase as the signal variations on the grid of the amplifying triode.
  • a thermionic amplifying tube In an audio frequency amplifying system, a thermionic amplifying tube, a grid in said tube, an input circuit connected to said grid, a second amplifier tube connected in said input circuit, a grid anda cathode in said second tube, said grid and cathode being connected in series with said first mentioned grid, a source of positive potential connected to the plate of said second amplifier tube, and means whereby said source of potential tends to bias the grid of the first tube positively andthe grid of the second tube negatively, the last mentioned means including a conductive connection from the grid of the first tube to the cathode of the second tube, and a connection from the grid of the second tube to the cathode of the first tube.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US394172A 1929-09-21 1929-09-21 Method and means for increasing the power output of a thermionic tube Expired - Lifetime US1959540A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
NL33740D NL33740C (enrdf_load_stackoverflow) 1929-09-21
US394172A US1959540A (en) 1929-09-21 1929-09-21 Method and means for increasing the power output of a thermionic tube
GB26616/30A GB362504A (en) 1929-09-21 1930-09-05 Improvements in method and means for increasing the power output of a thermionic tube
FR703420D FR703420A (fr) 1929-09-21 1930-09-17 Dispositif de lampe électronique applicable aux systèmes amplificateurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US394172A US1959540A (en) 1929-09-21 1929-09-21 Method and means for increasing the power output of a thermionic tube

Publications (1)

Publication Number Publication Date
US1959540A true US1959540A (en) 1934-05-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
US394172A Expired - Lifetime US1959540A (en) 1929-09-21 1929-09-21 Method and means for increasing the power output of a thermionic tube

Country Status (4)

Country Link
US (1) US1959540A (enrdf_load_stackoverflow)
FR (1) FR703420A (enrdf_load_stackoverflow)
GB (1) GB362504A (enrdf_load_stackoverflow)
NL (1) NL33740C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR703420A (fr) 1931-04-30
NL33740C (enrdf_load_stackoverflow)
GB362504A (en) 1931-12-07

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