GB533254A - Improvements in or relating to thermionic amplifiers with negative feedback and volume control - Google Patents

Improvements in or relating to thermionic amplifiers with negative feedback and volume control

Info

Publication number
GB533254A
GB533254A GB28510/39A GB2851039A GB533254A GB 533254 A GB533254 A GB 533254A GB 28510/39 A GB28510/39 A GB 28510/39A GB 2851039 A GB2851039 A GB 2851039A GB 533254 A GB533254 A GB 533254A
Authority
GB
United Kingdom
Prior art keywords
point
volume control
coil
negative feed
feed
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
GB28510/39A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB533254A publication Critical patent/GB533254A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes
    • H03G9/06—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control
    • H03G9/08—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control incorporating negative feedback

Landscapes

  • Selective Calling Equipment (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

533,254. Valve circuits for wireless reception. PHILIPS LAMPS, Ltd. Oct. 23, 1939, No. 28510. Convention date, Oct. 26, 1938. [Class 40 (v)] A radio receiver is arranged so that the amount of negative feed-back is reduced as the volume control is moved towards the position of maximum amplification, in which position, the negative feed-back is zero. The high frequency oscillations are fed from tuned circuit 2, 3 to a diode anode 9 and to a cathode 5 by way of resistances 11, 12 and coil 14. The rectified signal is taken from a slide contact 13 to grid 6 where after amplification, it passes by way of transformer 17, 18 to loudspeaker 20. Resistance 13 and coil 14 form the arms of a Wheatstone bridge the other two arms of which are formed by coil 15 and resistance 16, the ratio of the impedances being such that there is no potential difference between the point of junction of 12, 16 and the point of potential of 14, 15, due to the negative feed-back junction which is developed across 14, 15 and fed to grid 6 from movable contact 13. Thus as point 13 moves upwards to the point of maximum amplification, the amount of feed-back is reduced to zero. A tone filter 26-28 may be switched across the other diagonal of the bridge to give tone control which varies with volume control. Reference has been directed by the Comptroller to Specification 497,319.
GB28510/39A 1938-10-26 1939-10-23 Improvements in or relating to thermionic amplifiers with negative feedback and volume control Expired GB533254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL533254X 1938-10-26

Publications (1)

Publication Number Publication Date
GB533254A true GB533254A (en) 1941-02-10

Family

ID=19787169

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28510/39A Expired GB533254A (en) 1938-10-26 1939-10-23 Improvements in or relating to thermionic amplifiers with negative feedback and volume control

Country Status (1)

Country Link
GB (1) GB533254A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719191A (en) * 1950-10-17 1955-09-27 Hartford Nat Bank & Trust Co Circuit-arrangement of the kind comprising a plurality of amplifiers fed in parallel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2719191A (en) * 1950-10-17 1955-09-27 Hartford Nat Bank & Trust Co Circuit-arrangement of the kind comprising a plurality of amplifiers fed in parallel

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