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GB479882A - Improvements in or relating to thermionic amplifying systems - Google Patents

Improvements in or relating to thermionic amplifying systems

Info

Publication number
GB479882A
GB479882A GB2246236A GB2246236A GB479882A GB 479882 A GB479882 A GB 479882A GB 2246236 A GB2246236 A GB 2246236A GB 2246236 A GB2246236 A GB 2246236A GB 479882 A GB479882 A GB 479882A
Authority
GB
United Kingdom
Prior art keywords
tappings
feed
potentiometer
adjustable
amplifier
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
GB2246236A
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 NL48173D priority Critical patent/NL48173C/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2246236A priority patent/GB479882A/en
Priority to FR825221D priority patent/FR825221A/en
Publication of GB479882A publication Critical patent/GB479882A/en
Expired legal-status Critical Current

Links

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
    • H03F1/34—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
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/02—Details
    • H03C1/06—Modifications of modulator to reduce distortion, e.g. by feedback, and clearly applicable to more than one type of modulator

Landscapes

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

Abstract

479,882. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., and STRONG, C. E. Aug. 14, 1936, No. 22462. [Class 40 (v)] In an amplifier comprising a push-pull output stage and provided with a negative feed-back path for feeding back waves including the range of transmitted frequencies, the voltage to be fed back is derived from tappings adjustable to positions unbalanced about the earth point on impedances connected between the plates of the output valves. By this means, the proportion of the output voltage which is fed back can be readily controlled, and a desired amount of additional second harmonic component can be fed back at the same time. The input stage 2 of the amplifier may be a single valve or the early stages may be Class A pushpull amplifier stages, and the feed-back path may be connected to the resistance bridge 6, the feed-back voltage being obtained from a potentiometer 4, connected across the primary winding of the output transformer B, by adjustable tappings which are on either side of the earthed centre point of the potentiometer. By maintaining the distance between the tappings unchanged but adjusting them along the potentiometer it is possible to feed back second harmonic voltages in adjustable degree. The tappings are connected to a low-power transformer D, having a wide frequency response characteristic, the secondary winding of which is connected to the bridge 6.
GB2246236A 1936-08-14 1936-08-14 Improvements in or relating to thermionic amplifying systems Expired GB479882A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL48173D NL48173C (en) 1936-08-14
GB2246236A GB479882A (en) 1936-08-14 1936-08-14 Improvements in or relating to thermionic amplifying systems
FR825221D FR825221A (en) 1936-08-14 1937-08-05 Thermionic amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2246236A GB479882A (en) 1936-08-14 1936-08-14 Improvements in or relating to thermionic amplifying systems

Publications (1)

Publication Number Publication Date
GB479882A true GB479882A (en) 1938-02-14

Family

ID=10179747

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2246236A Expired GB479882A (en) 1936-08-14 1936-08-14 Improvements in or relating to thermionic amplifying systems

Country Status (3)

Country Link
FR (1) FR825221A (en)
GB (1) GB479882A (en)
NL (1) NL48173C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743839C (en) * 1938-09-01 1944-01-04 Siemens Ag Push-pull A amplifier circuit with negative feedback
DE1040606B (en) * 1954-02-12 1958-10-09 Siemens Ag Tube amplifier stage with voltage negative feedback

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743839C (en) * 1938-09-01 1944-01-04 Siemens Ag Push-pull A amplifier circuit with negative feedback
DE1040606B (en) * 1954-02-12 1958-10-09 Siemens Ag Tube amplifier stage with voltage negative feedback

Also Published As

Publication number Publication date
NL48173C (en)
FR825221A (en) 1938-02-25

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