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
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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
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 BE342384D priority patent/BE342384A/fr
Priority to BE364032D priority patent/BE364032A/fr
Priority to BE356547D priority patent/BE356547A/fr
Priority to BE332992D priority patent/BE332992A/xx
Priority to BE364249D priority patent/BE364249A/fr
Priority to BE351731D priority patent/BE351731A/fr
Priority to BE358214D priority patent/BE358214A/fr
Priority to BE338048D priority patent/BE338048A/fr
Priority to BE371876D priority patent/BE371876A/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/en
Priority to FR32724D priority patent/FR32724E/en
Priority to FR33155D priority patent/FR33155E/en
Priority to FR33447D priority patent/FR33447E/en
Priority to FR33996D priority patent/FR33996E/en
Priority to FR34843D priority patent/FR34843E/fr
Priority to FR35761D priority patent/FR35761E/en
Priority to FR35579D priority patent/FR35579E/en
Priority to FR35771D priority patent/FR35771E/en
Priority to FR36008D priority patent/FR36008E/en
Priority to FR37327D priority patent/FR37327E/en
Priority to FR37676D priority patent/FR37676E/en
Priority to FR37829D priority patent/FR37829E/en
Priority to FR37830D priority patent/FR37830E/en
Priority to FR37832D priority patent/FR37832E/en
Priority to FR37835D priority patent/FR37835E/en
Application granted granted Critical
Publication of US1728879A publication Critical patent/US1728879A/en
Priority to FR37837D priority patent/FR37837E/en
Priority to FR38851D priority patent/FR38851E/en
Priority to FR38884D priority patent/FR38884E/en
Priority to FR39679D priority patent/FR39679E/en
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.

Description

, Patented se 11, 1929 UNITED STATES PA-TENT OFFICE CHESTER W. RICE EDWARD W. KELLOGG, OF SGHENECTADY, NEW YORK, AS-
I BIGNOBS TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK AMPLIFYING SYSTEM Application filed March 3, 1925. Serial No. 12,977.
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.
The novel features which we believe to be characteristic of our invention are set forth with particularly in the appended claims. Our invention itself, however, both as to its organization and method of operation, will best be understood by reference to the following description taken in connection with the an accompanying drawing in which we have shown diagrammatically a circuit arrangement whereby our invention may be carried into effect. c
We have indicated in the drawing 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 and a third secondary winding 9 furnishes heating current for the cathode of amplifying tube 2. If desired the cathode of amplifying tube 1 also may be supplied with heating current from this source, al-
though in the present case we have shown a battery 10 for this purpose. 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. Current for the operation of the plate circuit of tube 1 is supplied by the rectifiers 7 and 7 This late circuit may be traced from the mid point 14: of the sec- 00 ondary 8 through the magnetizing winding 15 of a sound reproducing device 16 through resistances 17 and 18 to the plate or anode of amplifying tube 1, to the cathode of this tube, from thence through a resistance 19 05 to the ground bus 20 and from thence to the mid point 22 of secondary winding 6 and through the rectifiers -7 and 7 back to the point 14. Smoothing condensers 23 and 24 are connected across the circuit on either side of the inductance 15. The potential variations produced at the anode of device 1 are impressed through a coupling condenser 25 upon the input circuit of amplifying tube 2. The amplified currents produced in the plate circuit of device 2 are supplied by transformer 26 to the coil 27 of the sound-reproducing device 16.
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.
We have found in practice that 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 fier tube 1.
the plate circuit, the grid of theamplifier tube being connected through a grid leak 31 to the end of this resistance remote from the cathode. By reason of the drop of otential across this resistance 30 produce by the plate current the cathode will always be positive with respect to the grid. 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.
As a convenient means for regulating. 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.
These cores are fitted together as indicated to form a closed magnetic circuit having air gaps at the points where the cores come together. By this arrangement it is possible to avoid the efiect of any magnetic coupling between the output of the amplifying apparatus and the input. Any' potentials induced in the input choke coil will be induced in opposite directions in the two halves of the coil and thus be neutralized.
If the sound-reproducing apparatus is connected to the circuit at the time that the filament circuits are closed, an objectionable noise may be produced. To prevent this 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:
1. The combination in an amplifying system of an electron discharge amplifier having an electron emitting cathode, ananode and a controlling grid and having plate and grid circuits associated therewith, a sound-reproducing device associated with the plate circuit, a source of alternating current and a rectifier for supplying current for the plate circuit and means for smoothing out the current supplied to the plate circuit including a reactance which also serves to produce a constant magnetic field for the operation of the sound-reproducing device.
2. The combination in an electron discharge amplifying system of an input circuit, an output circuit, and a choke comprising coils wound upon opposite portions of a magnetic core and connected in said input circuit in series with one another whereby the effect of magnetic coupling between said output and input circuits is eliminated.
3. The combination of current sup 1y means, a sound producing device provided with field and armature windings, a rectifier, impedance elements conductively connected to said supply means through said rectifier and said field winding, amplifying means provided with a cathode connected to an anode through one part of said elements and with a grid connected to said cathode through a different part of said elements for controlling the current transmitted between said cathode and anode and means connected between said cathode and anode for energizing said armature winding.
4. 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.
5. The combination of current supply means, a rectifier, an impedance device connected to said supply means through said rectifier, amplifying means provided with a cathode connected to an anode through one circuit through said field winding, and means connected in said output circuit for energizing said armature Winding.
7. The combination of a pair of concatenated :uuplifiers each provided with an output circuit, a sound producing device including armature and field windings, a source of rectified current conductively connected to one of said output circuits through said field Winding. and means for coupling the other of said output circuits to said armature windmg. p
In witness whereof, We have hereunto set our hands this 2nd da of March, 1925.
CHESTE W. RICE. EDWARD W. KELLOGG.
US12977A 1925-03-03 1925-03-03 Amplifying system Expired - Lifetime US1728879A (en)

Priority Applications (33)

Application Number Priority Date Filing Date Title
BE338048D BE338048A (en) 1925-03-03
BE356547D BE356547A (en) 1925-03-03
BE342384D BE342384A (en) 1925-03-03
BE364249D BE364249A (en) 1925-03-03
BE351731D BE351731A (en) 1925-03-03
BE371876D BE371876A (en) 1925-03-03
BE406977D BE406977A (en) 1925-03-03
BE332992D BE332992A (en) 1925-03-03
BE358214D BE358214A (en) 1925-03-03
BE364032D BE364032A (en) 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 (en) 1925-03-03 1926-03-02 Improvements to amplifier systems
FR32724D FR32724E (en) 1925-03-03 1926-11-04 Improvements to amplifier systems
FR33155D FR33155E (en) 1925-03-03 1927-02-04 Improvements to amplifier systems
FR33447D FR33447E (en) 1925-03-03 1927-05-10 Improvements to amplifier systems
FR33996D FR33996E (en) 1925-03-03 1927-08-17 Improvements to amplifier systems
FR34843D FR34843E (en) 1925-03-03 1927-12-31
FR35761D FR35761E (en) 1925-03-03 1928-06-01 Improvements to amplifier systems
FR35579D FR35579E (en) 1925-03-03 1928-06-01 Improvements to amplifier systems
FR35771D FR35771E (en) 1925-03-03 1928-07-12 Improvements to amplifier systems
FR36008D FR36008E (en) 1925-03-03 1928-10-15 Improvements to amplifier systems
FR37327D FR37327E (en) 1925-03-03 1929-02-11 Improvements to amplifier systems
FR37676D FR37676E (en) 1925-03-03 1929-02-16 Improvements to amplifier systems
FR37829D FR37829E (en) 1925-03-03 1929-04-19 Improvements to amplifier systems
FR37830D FR37830E (en) 1925-03-03 1929-05-08 Improvements to amplifier systems
FR37832D FR37832E (en) 1925-03-03 1929-06-06 Improvements to amplifier systems
FR37835D FR37835E (en) 1925-03-03 1929-08-22 Improvements to amplifier systems
FR37837D FR37837E (en) 1925-03-03 1929-09-24 Improvements to amplifier systems
FR38851D FR38851E (en) 1925-03-03 1929-10-04 Improvements to amplifier systems
FR38884D FR38884E (en) 1925-03-03 1930-07-09 Improvements to amplifier systems
FR39679D FR39679E (en) 1925-03-03 1930-12-12 Improvements to amplifier systems
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

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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 (en)
BE (1) BE332992A (en)
FR (1) FR611997A (en)
GB (1) GB248731A (en)

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 (en) * 1927-10-14 1955-08-11 Opta Radio A G Power supply unit for receivers

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
BE332992A (en)
GB248731A (en) 1927-05-05
FR611997A (en) 1926-09-14

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