GB494024A - Improvements relating to tone correction in low frequency thermionic amplifiers - Google Patents

Improvements relating to tone correction in low frequency thermionic amplifiers

Info

Publication number
GB494024A
GB494024A GB1291137A GB1291137A GB494024A GB 494024 A GB494024 A GB 494024A GB 1291137 A GB1291137 A GB 1291137A GB 1291137 A GB1291137 A GB 1291137A GB 494024 A GB494024 A GB 494024A
Authority
GB
United Kingdom
Prior art keywords
feed back
low
resistance
valve
condenser
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
GB1291137A
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.)
ARTHUR EVEREST FALKUS
EK Cole Ltd
Original Assignee
ARTHUR EVEREST FALKUS
EK Cole Ltd
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 ARTHUR EVEREST FALKUS, EK Cole Ltd filed Critical ARTHUR EVEREST FALKUS
Priority to GB1291137A priority Critical patent/GB494024A/en
Publication of GB494024A publication Critical patent/GB494024A/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

Abstract

494,024. Valve amplifying circuits. COLE, Ltd., E. K., and FALKUS, A. E. May 6, 1937, No. 12911. [Class 40 (v)] In an audio-frequency amplifier in which tone correction is obtained by negative feed back, it is arranged that the ratio of feed back energy to signal strength is greatest at low volumecontrol settings so that the low and /or high frequencies are further accentuated relative to the middle frequencies at low volume. Leads 11, 14 feed back energy from the output of valve V2 to the grid circuit of valve V1, and condenser-resistance combinations 12, 13 ; 6, 7, are so arranged that the feed back voltage is diminished at low and high frequencies to produce the required tone compensation. The resistance 6 across which the feed back voltage appears has connected in series across it the volume control 5, diode load 3 and blocking condenser 4 and the bias resistance and condenser combination 15, 16. The resistances 3 and 5 represent the majority of the impedance in the loop circuit and the proportion of the voltage across resistance 6 which appears at the grid of V1 diminishes as the slider of the potentiometer 5 is moved from the minimum end. Switching means may be provided to disable at will the feed back circuit which may also be modified to produce only bass boost or top boost.
GB1291137A 1937-05-06 1937-05-06 Improvements relating to tone correction in low frequency thermionic amplifiers Expired GB494024A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1291137A GB494024A (en) 1937-05-06 1937-05-06 Improvements relating to tone correction in low frequency thermionic amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1291137A GB494024A (en) 1937-05-06 1937-05-06 Improvements relating to tone correction in low frequency thermionic amplifiers

Publications (1)

Publication Number Publication Date
GB494024A true GB494024A (en) 1938-10-19

Family

ID=10013384

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1291137A Expired GB494024A (en) 1937-05-06 1937-05-06 Improvements relating to tone correction in low frequency thermionic amplifiers

Country Status (1)

Country Link
GB (1) GB494024A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287143B (en) * 1967-12-29 1969-01-16 Telefunken Patent Circuit arrangement for correct loudness adjustment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287143B (en) * 1967-12-29 1969-01-16 Telefunken Patent Circuit arrangement for correct loudness adjustment

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