US1728879A - Amplifying system - Google Patents

Amplifying system Download PDF

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Publication number
US1728879A
US1728879A US12977A US1297725A US1728879A US 1728879 A US1728879 A US 1728879A US 12977 A US12977 A US 12977A US 1297725 A US1297725 A US 1297725A US 1728879 A US1728879 A US 1728879A
Authority
US
United States
Prior art keywords
current
circuit
amplifying
sound
cathode
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
US12977A
Other languages
English (en)
Inventor
Chester W Rice
Edward W Kellogg
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.)
General Electric Co
Original Assignee
General Electric Co
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 BE406977D priority Critical patent/BE406977A/xx
Priority to BE332992D priority patent/BE332992A/xx
Priority to BE364032D priority patent/BE364032A/fr
Priority to BE342384D priority patent/BE342384A/fr
Priority to BE356547D priority patent/BE356547A/fr
Priority to BE364249D priority patent/BE364249A/fr
Priority to BE358214D priority patent/BE358214A/fr
Priority to BE371876D priority patent/BE371876A/fr
Priority to BE351731D priority patent/BE351731A/fr
Priority to BE338048D priority patent/BE338048A/fr
Application filed by General Electric Co filed Critical General Electric Co
Priority to US12977A priority patent/US1728879A/en
Priority to GB4705/26A priority patent/GB248731A/en
Priority to FR611997D priority patent/FR611997A/fr
Priority to FR32724D priority patent/FR32724E/fr
Priority to FR33155D priority patent/FR33155E/fr
Priority to FR33447D priority patent/FR33447E/fr
Priority to FR33996D priority patent/FR33996E/fr
Priority to FR34843D priority patent/FR34843E/fr
Priority to FR35761D priority patent/FR35761E/fr
Priority to FR35579D priority patent/FR35579E/fr
Priority to FR35771D priority patent/FR35771E/fr
Priority to FR36008D priority patent/FR36008E/fr
Priority to FR37327D priority patent/FR37327E/fr
Priority to FR37676D priority patent/FR37676E/fr
Priority to FR37829D priority patent/FR37829E/fr
Priority to FR37830D priority patent/FR37830E/fr
Priority to FR37832D priority patent/FR37832E/fr
Priority to FR37835D priority patent/FR37835E/fr
Application granted granted Critical
Publication of US1728879A publication Critical patent/US1728879A/en
Priority to FR37837D priority patent/FR37837E/fr
Priority to FR38851D priority patent/FR38851E/fr
Priority to FR38884D priority patent/FR38884E/fr
Priority to FR39679D priority patent/FR39679E/fr
Priority to US703742A priority patent/US2086415A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/08—Constructional details, e.g. cabinet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H04B1/1623—Supply circuits using tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/005—Reducing noise, e.g. humm, from the supply
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
    • H04R3/08—Circuits for transducers, loudspeakers or microphones for correcting frequency response of electromagnetic transducers

Definitions

  • Our present invention relates to thermionic amplifying apparatus, and es ecially to an apparatus which is particular y adapted to furnish an appreciable amount of power for the operation of sound producing apparatus.
  • One of the objects of our invention is to rovide an amplifying apparatus which may e supplied-with current for its operation from an alternating source such, for example, as an ordinary house lighting circuit.
  • a further object of our invention is to provide an effective means for smoothing out the rectified current supplied to the amplifying apparatus to such an extent that no disagreeable noise will be produced in the circuits by reason of the fact that an alternating source of supply is employed.
  • Still another object of our invention is to provide a means for eliminating the undesired efiects of magnetic coupling in an amplifying apparatus between the output and the input circuits.
  • an amplifying system which comprises two thermionic amplifying tubes 1 and 2.
  • Current for the. operation of these tubes is furnished from alternating current supply mains 3 and 4 to the primary 5 of a transformer.
  • This transformer has a secondary winding 6, the terminals of which are connected to the anodes of two thermionic rectifiers 7 and 7.
  • Another secondary winding 8 furnishes current for heating the cathodes of rectifiers 7 and 7
  • a third secondary winding 9 furnishes heating current for the cathode of amplifying tube 2.
  • the cathode of amplifying tube 1 also may be supplied with heating current from this source, al-
  • the voltages to be amplified are supplied to a jack 11 and applied through a couplin condenser 13 to the input circuit of amplifier tube 1.
  • the choke 12 provides a path for the direct current of the circuit from which the voltages are supplied.
  • the sound-reproducing device 16 is of the type in which the diaphragm is operated by so means of a coil located in a strong magnetic field. For convenience of illustration the diaphragm of the sound-reproducing device has not been shown.
  • the magnetic field for the operation of the sound-reproducing device is furnished by the winding 15 which is -wound upon a central portion of a magnetic core, the armature coil 27 being located in an angular air gap formed between the central leg 28 of the magnetic core and the outer portion 29, which may be of cylindrical form.
  • the field winding 15 serves as an efficient choke for assisting in smoothing out the fluctuations in the rectified current, and at the same time, it furnishes the strong magnetic field required for the operation of the sound-reproducing device.
  • Negative bias for the grid of amplifier tube 2 is furnished by a resistance 30 connected in 109 bomb tube 1.
  • This method of providing a bias for the grid has the advantage that if for any reason the plate current tends to become undul large the negative bias on the grid will e increased and prevent an excessive rise in the plate current- Similarly, the resistance 19 serves to provide a negative bias for the grid of ampli- Since the current required to produce the desired magnetic field for the operation of the sound-reproducing device may be greater than that taken by the plate circuits of the amplifying tubes, a shunt path is provided around the amplifying tubes which includes a resistance 32. By roper choice of this resistance the current owing through winding 15 maybe made of any desired value.
  • the current supplied to the sound-reproducing apparatus we have provided in the input circuit of tube 1 a resistance 33 with variable taps to be connected to the. grid of tube 1 by means of a switch 34. In this way the voltage applied to the grid of tube 1 can be adjusted to any desired value.
  • the choke coil 12 comprises two separate windings 35 and 36 which are wound upon separate L shaped iron cores 37 and 38.
  • the switch 39 by means of which the current sources are connected to the apparatus, is provided with an'extra pole 40 which does not close until after the other poles of the switch are closed.
  • This extra pole 4O closes the circuit of the operating coil 27 of the sound-reproducing apparatus.
  • the choke 12 is preferably provided with a metal case indicated by dotted lines 41, and this case is grounded by connection 42 to prevent any electrostatic coupling from the output of the amplifier to the input. If desired, the transformer 26 ma be provided with a grounded case also. at we claim as new and desire to secure by Letters Patent of the United States, is:
  • the combination of current supply means, a rectifier, impedance elements connected to said supply means through said rectifier, and amplifying means comprising a plurality of amplifiers, one of said amplifiers being provided with a cathode connected to an anode through said elements and another of said amplifiers being provided with a cathode connected to an anode through one part of said elements and with a grid connected to said last mentioned cathode through a part of said elements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Amplifiers (AREA)
  • Magnetically Actuated Valves (AREA)
US12977A 1925-03-03 1925-03-03 Amplifying system Expired - Lifetime US1728879A (en)

Priority Applications (33)

Application Number Priority Date Filing Date Title
BE364032D BE364032A (enrdf_load_html_response) 1925-03-03
BE342384D BE342384A (enrdf_load_html_response) 1925-03-03
BE356547D BE356547A (enrdf_load_html_response) 1925-03-03
BE364249D BE364249A (enrdf_load_html_response) 1925-03-03
BE358214D BE358214A (enrdf_load_html_response) 1925-03-03
BE371876D BE371876A (enrdf_load_html_response) 1925-03-03
BE406977D BE406977A (enrdf_load_html_response) 1925-03-03
BE332992D BE332992A (enrdf_load_html_response) 1925-03-03
BE338048D BE338048A (enrdf_load_html_response) 1925-03-03
BE351731D BE351731A (enrdf_load_html_response) 1925-03-03
US12977A US1728879A (en) 1925-03-03 1925-03-03 Amplifying system
GB4705/26A GB248731A (en) 1925-03-03 1926-02-18 Improvements in thermionic valve amplifying systems
FR611997D FR611997A (fr) 1925-03-03 1926-03-02 Perfectionnements aux systèmes amplificateurs
FR32724D FR32724E (fr) 1925-03-03 1926-11-04 Perfectionnements aux systèmes amplificateurs
FR33155D FR33155E (fr) 1925-03-03 1927-02-04 Perfectionnements aux systèmes amplificateurs
FR33447D FR33447E (fr) 1925-03-03 1927-05-10 Perfectionnements aux systèmes amplificateurs
FR33996D FR33996E (fr) 1925-03-03 1927-08-17 Perfectionnements aux systèmes amplificateurs
FR34843D FR34843E (enrdf_load_html_response) 1925-03-03 1927-12-31
FR35761D FR35761E (fr) 1925-03-03 1928-06-01 Perfectionnements aux systèmes amplificateurs
FR35579D FR35579E (fr) 1925-03-03 1928-06-01 Perfectionnements aux systèmes amplificateurs
FR35771D FR35771E (fr) 1925-03-03 1928-07-12 Perfectionnements aux systèmes amplificateurs
FR36008D FR36008E (fr) 1925-03-03 1928-10-15 Perfectionnements aux systèmes amplificateurs
FR37327D FR37327E (fr) 1925-03-03 1929-02-11 Perfectionnements aux systèmes amplificateurs
FR37676D FR37676E (fr) 1925-03-03 1929-02-16 Perfectionnements aux systèmes amplificateurs
FR37829D FR37829E (fr) 1925-03-03 1929-04-19 Perfectionnements aux systèmes amplificateurs
FR37830D FR37830E (fr) 1925-03-03 1929-05-08 Perfectionnements aux systèmes amplificateurs
FR37832D FR37832E (fr) 1925-03-03 1929-06-06 Perfectionnements aux systèmes amplificateurs
FR37835D FR37835E (fr) 1925-03-03 1929-08-22 Perfectionnements aux systèmes amplificateurs
FR37837D FR37837E (fr) 1925-03-03 1929-09-24 Perfectionnements aux systèmes amplificateurs
FR38851D FR38851E (fr) 1925-03-03 1929-10-04 Perfectionnements aux systèmes amplificateurs
FR38884D FR38884E (fr) 1925-03-03 1930-07-09 Perfectionnements aux systèmes amplificateurs
FR39679D FR39679E (fr) 1925-03-03 1930-12-12 Perfectionnements aux systèmes amplificateurs
US703742A US2086415A (en) 1925-03-03 1933-12-23 Magnetic pick-up

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12977A US1728879A (en) 1925-03-03 1925-03-03 Amplifying system

Publications (1)

Publication Number Publication Date
US1728879A true US1728879A (en) 1929-09-17

Family

ID=21757662

Family Applications (1)

Application Number Title Priority Date Filing Date
US12977A Expired - Lifetime US1728879A (en) 1925-03-03 1925-03-03 Amplifying system

Country Status (4)

Country Link
US (1) US1728879A (enrdf_load_html_response)
BE (1) BE332992A (enrdf_load_html_response)
FR (1) FR611997A (enrdf_load_html_response)
GB (1) GB248731A (enrdf_load_html_response)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739286A (en) * 1950-09-01 1956-03-20 Robert W Schede Alpha survey meter circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760572C (de) * 1927-10-14 1955-08-11 Opta Radio A G Netzanschlussgeraet fuer Empfangsgeraete

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739286A (en) * 1950-09-01 1956-03-20 Robert W Schede Alpha survey meter circuit

Also Published As

Publication number Publication date
GB248731A (en) 1927-05-05
BE332992A (enrdf_load_html_response)
FR611997A (fr) 1926-09-14

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