GB491803A - Improvements in or relating to thermionic amplifiers - Google Patents

Improvements in or relating to thermionic amplifiers

Info

Publication number
GB491803A
GB491803A GB6814/37A GB681437A GB491803A GB 491803 A GB491803 A GB 491803A GB 6814/37 A GB6814/37 A GB 6814/37A GB 681437 A GB681437 A GB 681437A GB 491803 A GB491803 A GB 491803A
Authority
GB
United Kingdom
Prior art keywords
amplifier
output
voltage
driven
series
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
Application number
GB6814/37A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 BE425863D priority Critical patent/BE425863A/xx
Priority to GB1957/37A priority patent/GB489289A/en
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to CH238067D priority patent/CH238067A/en
Priority to FR832354D priority patent/FR832354A/en
Priority to US186062A priority patent/US2213871A/en
Priority to US192083A priority patent/US2241892A/en
Publication of GB491803A publication Critical patent/GB491803A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36—Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/26—Push-pull amplifiers; Phase-splitters therefor
    • H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

491,803. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., and STRONG, C. E. March 8, 1937, No. 6814. [Class 40 (v)] In an amplifying system particularly adapted to high-frequency power amplification, a driving amplifier and a driven amplifier feed power in series into a common load in such a manner that the driven amplifier is excited by the output from the driving amplifier and that at the drive voltage necessary to produce a predetermined plate swing in the driven amplifier, the driving amplifier delivers sufficient power to provide the current required in the output load as determined by the driven amplifier and in addition any incidental power losses in the grid circuit of the driven amplifier. Fig. 2 is an application to push-pull amplifiers. The driving amplifier 1 is a known neutralized push-pull amplifier the output of which is fed through the output transformer across the resistance 3 to the cathodes of the driven amplifier 2. The grids of amplifier 2 are earthed so that the plate voltage is in series and in phase with the driving voltage with the result that amplifiers 1 and 2 feed power in series into a load resistance 4. The inductance of the grid earth leads is neutralized by condensers 5 and 6. The direct plate voltage may be applied to the two amplifiers in parallel as shown or in series as in Fig. 4 (not shown). The filaments of the amplifier 2 are at a high frequency voltage and are fed through high impedance reactors or through a shielded transformer, Fig. 6, having earth shields 9, 10 between the primary and secondary windings and shields 11, 12 surrounding the secondary windings. The input high-frequency tuning coil 13 forms an anti-resonant circuit with the capacities between shields 9 and 11, and 10 and 12. For grid modulation of the output the first amplifier is fed with modulated waves or is modulated by grid voltage variation, and for plate modulation, modulation voltages are applied to both plates simultaneously.
GB6814/37A 1937-01-22 1937-03-08 Improvements in or relating to thermionic amplifiers Expired GB491803A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE425863D BE425863A (en) 1937-01-22
GB1957/37A GB489289A (en) 1937-01-22 1937-01-22 Improvements in or relating to thermionic amplifiers
CH238067D CH238067A (en) 1937-01-22 1938-01-12 High frequency tube amplifier.
FR832354D FR832354A (en) 1937-01-22 1938-01-21 Thermionic amplifiers and similar devices
US186062A US2213871A (en) 1937-01-22 1938-01-21 Thermionic amplifier
US192083A US2241892A (en) 1937-01-22 1938-02-23 Thermionic amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB238067X 1937-01-22

Publications (1)

Publication Number Publication Date
GB491803A true GB491803A (en) 1938-09-08

Family

ID=10201623

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6814/37A Expired GB491803A (en) 1937-01-22 1937-03-08 Improvements in or relating to thermionic amplifiers

Country Status (1)

Country Link
GB (1) GB491803A (en)

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