GB424735A - Improvements in thermionic amplifiers - Google Patents

Improvements in thermionic amplifiers

Info

Publication number
GB424735A
GB424735A GB9024/34A GB902434A GB424735A GB 424735 A GB424735 A GB 424735A GB 9024/34 A GB9024/34 A GB 9024/34A GB 902434 A GB902434 A GB 902434A GB 424735 A GB424735 A GB 424735A
Authority
GB
United Kingdom
Prior art keywords
resistance
amplifier
point
valves
slider
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
GB9024/34A
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.)
Koninklijke Philips NV
Original Assignee
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB424735A publication Critical patent/GB424735A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes

Abstract

424,735. Valve circuits for wireless reception. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. March 22, 1934, No. 9024. Convention date, May 18, 1933. [Class 40 (v)] The grid bias of one or more of the valves of an amplifier is caused to vary according to the strength and the frequency of the signals to which the amplifier is tuned. As shown, the grids of the controlled valves are connected to a point e on a resistance R4, one end of which is connected to the load resistance R3 of a diode 3 which rectifies the signals and the other end being connected to a variable tapping d on a potentiometer R5, R1 connected across a D.C. source 1, 2. Thus the potential of the point e is dependent on the strength of the rectified current in the resistance R3 and on the position of the slider d which is ganged to the tuning control of the amplifier. A permanent positive potential is applied to the anode of the diode 3 from a point a on the resistance R1 through a resistance R2 so that the anode never becomes negative whatever the position of the slider d. A modification is described, Fig. 2, (not shown), in which the automatic gain control is applied to one only of the amplifying valves.
GB9024/34A 1933-05-18 1934-03-22 Improvements in thermionic amplifiers Expired GB424735A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL424735X 1933-05-18

Publications (1)

Publication Number Publication Date
GB424735A true GB424735A (en) 1935-02-27

Family

ID=19786104

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9024/34A Expired GB424735A (en) 1933-05-18 1934-03-22 Improvements in thermionic amplifiers

Country Status (1)

Country Link
GB (1) GB424735A (en)

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