US2137413A - Thermionic amplifier - Google Patents

Thermionic amplifier Download PDF

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Publication number
US2137413A
US2137413A US664356A US66435633A US2137413A US 2137413 A US2137413 A US 2137413A US 664356 A US664356 A US 664356A US 66435633 A US66435633 A US 66435633A US 2137413 A US2137413 A US 2137413A
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United States
Prior art keywords
amplifier
cathode
thermionic
separate
input
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
US664356A
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English (en)
Inventor
Plaistowe Donald Leopold
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.)
RCA Corp
Original Assignee
RCA Corp
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Filing date
Publication date
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Publication of US2137413A publication Critical patent/US2137413A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only

Definitions

  • two signal inputs derived, for example, from two microphones are applied to two separate and distinct amplifiers which may be of any known type and which are represented in the accompanying drawing as within the rectangle A1 and A2 respectively, the inputs to these amplifiers being applied as indicated by the .arrows marked l and 2 respectively.
  • the output fromnthe ampliliers A1 and A2 are applied to the input circuits of two triodes V1 and V2 respectively, these triodes being illustrated as of the indirectly heated cathode type.
  • the triodes V1 and V2 are the ampliers whose total output is required to be ampliiied in a common succeeding stage and as will be seen ⁇ the two valves V1 and V2 are in series with a source of plate potential ⁇ (not shown).
  • the ⁇ positive terminal +HT of the source (not shown) of plate potential is connected through an anode resistance AR to the anode of one Valve V1 the cathode of which is directlyconnected to the anode of the other valve V2 the cathode of the last mentioned valve being connected to earth.
  • anode resistance AR to the anode of one Valve V1 the cathode of which is directlyconnected to the anode of the other valve V2 the cathode of the last mentioned valve being connected to earth.
  • grid resistances GRi or GRz are connected as shown between each grid and a suitable source of bias potentials B1 Aor B2.
  • the junction point of the anode resistance and 'the anode to which said resistance is directly connected is connected through a coupling condenser as shown to the rst grid of a ⁇ common amplifier indicated within the rectangle Ci.
  • the invention is of course not limited to arrangements wherein'inter-stage coupling is eifected vas illustrated by resistance and capacity but other forms of coupling may be employed.
  • An amplifying system comprising a source ofpotentials to be amplied, a first amplifier therefor, means including a condenser for capac- ⁇ itively coupling said sourcev to the input side of said amplifier, a second source of potentials to be amplified, a second amplifier, means including a condenser for capacitively coupling-said second source to the input side oi said second amplifier, a tube having an input grid, a' cathode and a plate, means including a condenser ier capacitively coupling the output ci" the first ampliiier to the input grid and cathode of ⁇ said tube, another tube having an input grid, a cathode and a plate, means including a condenser for capacitively coupling the output of said second amplilier to the input grid and cathode of other tube, means for directlyconnecting the cathode of one of said tubes in series with tiepiateof the other of said tubes, a connection supplying plate potential
  • circuit system wherein the total output of a plurality of amplifiers receiving separate inputs is required to be amplified in a common succeeding amplifier
  • said circuit system comprising, a plurality of separate input sources, a separate amplifier having a plurality of thermionic tubes connected to each separate input source, means for combining the output of said separate amplifiers comprising a first and second thermionic amplifier device having at l least an anode, grid and cathode, each one of said thermionic amplifier devices being coupled to said separate input sources by separate capacitive means connected from the output of each of said separate amplifiers to the grid of the respective thermionic amplifier device, said thermionic amplifier devices being connected in series by a connection from the cathode of said first thermionic device to the anode of said second thermionic device, the output of said first and second thermionic devices being connected across the input circuit of the co-mmon succeeding amplifier.
  • circuit system wherein the total output of a plurality of amplifiers receiving separate inputs is required to be amplified in a common succeeding amplifier, said circuit system comprising, a plurality of separate input sources, a separate amplifier having a plurality of thermionic tubes connected to each separate input source, means for combining the output of said separate amplifiers comprising a first and a second thermionic amplifier device each having at least an anode, grid and cathode electrode, capacitive coupling means connecting the output of said separate amplifiers to the grids of said first and second thermionic amplifier devices, an anode resistance connected from the anode of said first thermionic amplifier device to the positive side of a high potential source, the cathode of said first thermionic amplifier device being connected to the anode of said second thermionic amplifier device, the cathode of said second thermionic device being connected tothe negative side of said high potential device, and a coupling condenser connected to the junction point of said ano
  • An amplifying system comprising a source of potentials to be amplified, a first amplifier therefor, means including a condenser coupling said source to the input side of said amplifier, a second source of potentials to be amplified, a second amplifier, means including a condenser for capacitively coupling said second source to the input side of said second amplifier, a vacuum tube having an input grid, a cathode, a separate heater for indirectly heating said cathode, and a plate, means including a condenser for capacitively coupling the output of the first amplifier to the input grid and cathode of said tube, anothervacuum tube having an input grid, a cathode, a separate heater for indirectly heating said cathode, and a plate, means including a condenser for capacitively coupling the output of said second amplifier to the input grid and cathode of said other tube, means for directly connecting the cathode of one of said tubes in series with the plate of the other of said tubes, a
  • An amplifying system comprising a source of potentials to be amplified, a. first amplifier therefor, capacitive means for coupling said source to the input side of said amplier, a second source of potentials to be amplified, a second amplifier, capacitive means for coupling said second source to the input side of said second amplifier, a vacuum tube having an input grid, a cathode, a separate heater for indirectly heating said cathode, and a plate, capacitive means for coupling the output of the first amplifier to the input -grid and cathode of said tube, another vacuum tube having an input grid, a cathode, a.
  • circuit system wherein the total output of a plurality of amplifiers receiving separate inputs is required to be amplified in a common succeeding amplifier, said circuit system comprising a plurality of separate input sources, a separate amplifier having a plurality of thermionic tubes connected to each separate input source, means for combining the output of said separate amplifiers comprising a first and second thermionic amplifier device having at least an anode, grid and cathode, each one of said thermi-onic amplier devices being coupled to said separate input sources by separate capacitive means connected from the output of each of said separate amplifiers to the grid of the respective thermionic amplifier device, a separate bias resistance and a source of bias potential connected in series between each grid and cathode of said first and second thermionic amplifier devices, said thermionic amplifier devices being connected in series by a connection from the cathode of said first thermionic device to the anode of said second thermionic device, the output of said first and second thermionic devices being connected
  • said circuit system comprising a plurality of separate input sources, a separate amplier having a plurality of thermionic tubes connected to each separate input source, means for combining the output of said separate amplifiers' comprising a first and a second thermionic amplifier device each having at least an anode, grid and cathode electrode, capacitive coupling means connecting the output of said separate ampliers to the grids of said first and second thermionic amplifier devices, a separate bias resistance and a source of bias potential connected in series between each grid and cathode of said rst and second thermionic amplifier device, an anode resistance con- 3 nected from the anode of said rst thermionic amplifier device to the positive side of a high potential source, the cathode of said rst thermionic amplifier device being connected to the an

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US664356A 1932-04-07 1933-04-04 Thermionic amplifier Expired - Lifetime US2137413A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2137413X 1932-04-07

Publications (1)

Publication Number Publication Date
US2137413A true US2137413A (en) 1938-11-22

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US664356A Expired - Lifetime US2137413A (en) 1932-04-07 1933-04-04 Thermionic amplifier

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US (1) US2137413A (fr)
FR (1) FR752995A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547324A (en) * 1945-11-26 1951-04-03 Wilmina L Hurley Apparatus for determining the voltage of a battery

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3090381B1 (fr) 2018-12-24 2021-02-26 Oreal Composition cosmétique à base de ginseng

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547324A (en) * 1945-11-26 1951-04-03 Wilmina L Hurley Apparatus for determining the voltage of a battery

Also Published As

Publication number Publication date
FR752995A (fr) 1933-10-04

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