US1872264A - Amplifier system - Google Patents

Amplifier system Download PDF

Info

Publication number
US1872264A
US1872264A US388153A US38815329A US1872264A US 1872264 A US1872264 A US 1872264A US 388153 A US388153 A US 388153A US 38815329 A US38815329 A US 38815329A US 1872264 A US1872264 A US 1872264A
Authority
US
United States
Prior art keywords
resistance
transformer
tube
circuit
grid
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
US388153A
Other languages
English (en)
Inventor
Feldtkeller Richard
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.)
Siemens and Halske AG
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US1872264A publication Critical patent/US1872264A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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

  • the transformer coupling allows an increased potential and, thereby, a larger amplification
  • the cores of the transformers are pre-magnetizedby the plate direct current in such a manner that This hardly possible to obtain sufficiently high inductances.
  • Hencathe lower frequencies are not suflicient- 1y amplified. It is, likewise, not possible to overcome this difficulty by feeding the plate potential to the amplifier tube by meansof a special choke coil, and capacitatively coupling the intermediate transformer to the tube.
  • thecore of'the plate choke coil is pre-magnetized with the result that its inductive apparent resistance becomes too small for the low frequencies. A loss in ainplification is, likewise, experienced in this case.
  • the above enumerated disadvantages are avoided by means of a couplin'g'circuit arrangement which 'combines the features or characteristics of 'the discussed circuit arrangements.
  • the pla-tez'circuit is closed through a resistance to which is coupled "capacitatively the intermediate transformer. Resistances may be used for this purpose which possess the highest resistive properties known in the prior art. These are, for exam- 1ple,hard carbon resistances, practicallyaren inductive 'and'non capacitative.
  • the plate of the amplifier tube V1 is connected through a resistance 1 twith the positive pole AB of the plate source.
  • a condenser C is inserted between the plate and the primary of the intermediate transformer U whose windings are collectively grounded, or connected to the heating battery H13.
  • the second terminal of the secondary is connected through a condenser Q; to the grid of the amplifier tube V which grid is connected to the negative pole GB of the grid source through a resistance B
  • a further stage may be connected in similar manner to the tube V
  • a further resistance R is shown which connects the plate of this tube with the positive pole AB of the common plate source.
  • Condenser C is the means of preventing the flowing of a grid direct current through the secondary of the intermediate transformer, while R furnishes the correct biasing potential in the grid.
  • Condenser C may occur, for instance, during whistling of the tubes, considerable grid currents which, in case they flow through the transformer winding, result in disturbances.
  • the core of the transformer U consists of magnetic materials which are very sensitive towards a strong magnetizing action.
  • the high initial permeability of high-percentage iron alloys, such as iron silicide, nickel iron or the like is destroyed, under certain circumstances due to grid direct current in the secondary winding.
  • the grid resistance R may be dimensioned in such a manner as to damp these peaks.
  • An amplifier circuit comprising a pair of triodes, a transformer coupling the output and input circuits of the triodes, a noninductive and non-capacitative resistance of high impedances in shunt with the transformer primary and connected in the said output circuit, a second resistance in shunt with the transformer secondary in the said input circuit, and a capacity connected in series between high potential points of each resistance and the transformer.
  • a pair of electron discharge tubes, combined resistance and inductive means for coupling the output circuit of one tube to the input circuit of the other tube comprising a transformer connected between the anode of one tube and the control electrode of the other tube, a source of potential for said anode, a high resistance of noninductive and non-capacitative characteristics in series with said anode and between the latter and its source of potential, a capacity connected to said anode and in series with said resistance and the primary of said transformer, and an electrical path, including a capacity and resistance in series, connected to the transformer secondary, said control electrode being connected to a pointon the path intermediate said capacity and resistance.
  • a pair of electron dis charge tubes, combined resistance and inductive means for coupling the output circuit of one tube to the input circuit of the other tube comprising a transformer connected between the anode of one tube and the control electrode of the other tube, a source of potential for the anode, a high resistance in series with said anode and between the latter and its source of potential, a capacity connected to said anode and in series with said resistance and the primary of said transformer, a source of biasing potential for said control electrode, and an electrical path, including a capacity and resistance in series, connected to the transformer secondary, said control electrode being connected to a point on the path between the capacity and resistance, said last mentioned resistance being connected between said control electrode and its source of biasing potential.
  • the condenser being disposed between high potential points of said resistance and primary, a source of biasing potential for the control electrode of the second tube, a grid leak resistor between the said control electrode and biasing source, and a condenser in series between the secondary of the transformer and said control electrode.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US388153A 1928-08-22 1929-08-24 Amplifier system Expired - Lifetime US1872264A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE317800X 1928-08-22

Publications (1)

Publication Number Publication Date
US1872264A true US1872264A (en) 1932-08-16

Family

ID=6150876

Family Applications (1)

Application Number Title Priority Date Filing Date
US388153A Expired - Lifetime US1872264A (en) 1928-08-22 1929-08-24 Amplifier system

Country Status (3)

Country Link
US (1) US1872264A (enrdf_load_stackoverflow)
FR (1) FR679689A (enrdf_load_stackoverflow)
GB (1) GB317800A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2514357A (en) * 1946-06-22 1950-07-11 Philco Corp Permeability-tuned high-frequency amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2514357A (en) * 1946-06-22 1950-07-11 Philco Corp Permeability-tuned high-frequency amplifier

Also Published As

Publication number Publication date
GB317800A (en) 1930-09-25
FR679689A (enrdf_load_stackoverflow) 1930-04-16

Similar Documents

Publication Publication Date Title
US2791646A (en) Electrical system for ultralinear amplifier
US1872264A (en) Amplifier system
US2161844A (en) Amplifier cascade with negative feedback
US2022972A (en) Variable gain amplifier
US2217269A (en) Push-pull audio amplifier circuit
US1957752A (en) Method and apparatus for amplifying frequency currents
US3061804A (en) Audio transformer
US1530648A (en) Electric circuits
US2035289A (en) Amplifier circuits
US2113263A (en) Electrical transmission system
GB378868A (en) Improvements in or relating to electric relays incorporating gas-filled tubes
US1615044A (en) Transformer circuit
US1943416A (en) Band pass amplifier
US1719445A (en) Amplifying system
US1546875A (en) Electron-discharge apparatus
US1840350A (en) Radiofrequency amplifier
US1632389A (en) Austen m
US2250606A (en) Degenerative amplifier
US1696263A (en) Radio apparatus
US2097258A (en) Electron discharge tube
US1846597A (en) Radio circuit and method of operating same
US2162267A (en) Amplifier
US1544921A (en) Amplifier circuits
US1789673A (en) Amplifier coupling
US1489228A (en) Method and means for neutralizing capacity coupling in audions