GB538486A - Improvements in or relating to variable-gain thermionic amplifiers - Google Patents
Improvements in or relating to variable-gain thermionic amplifiersInfo
- Publication number
- GB538486A GB538486A GB206940A GB206940A GB538486A GB 538486 A GB538486 A GB 538486A GB 206940 A GB206940 A GB 206940A GB 206940 A GB206940 A GB 206940A GB 538486 A GB538486 A GB 538486A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- gain
- cathode
- change
- effected
- 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
Links
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 abstract 1
- 230000003019 stabilising effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
- H03G3/04—Manually-operated control in untuned amplifiers
- H03G3/06—Manually-operated control in untuned amplifiers having discharge tubes
- H03G3/08—Manually-operated control in untuned amplifiers having discharge tubes incorporating negative feedback
Landscapes
- Networks Using Active Elements (AREA)
Abstract
538,486. Valve amplifying circuits. STANDARD TELEPHONES & CABLES, Ltd., ROCHE, A. H., and BLASHILL, T. Feb. 2, 1940, No. 2069. [Class 40 (v)] In an amplifier in which gain is controlled by varying the negative feedback by varying a resistance in the cathode lead means are provided to compensate for change in grid bias produced. The Fig. shows an arrangement in which the gain of the valve V, is effected by adjustment of the slider of cathode potentiometer P, connected between the cathode and earth and the bias correction is obtained by connecting the heating battery through a limiting resistance R 24 to the potentiometer. A similar gain control is applied to valve V 2 except that resistances R 12 , R 13 are inserted in a single step by switch KD, auxiliary contacts KD of which shortcircuit inductances L 1 , L 2 to correct for the change in input capacity. Inductance L 3 is provided in the anode circuit of valve V 2 to compensate phase change. The decoupling C 7 , R 11 and C 9 , R 16 further prevents phase shift at low frequencies, but by suitable choice of the latter elements correction of a small residual phase angle may be effected. The high tension supply should be of low impedance and may include stabilising means as described in Specification 526,665, [Group XXXV].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB206940A GB538486A (en) | 1940-02-02 | 1940-02-02 | Improvements in or relating to variable-gain thermionic amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB206940A GB538486A (en) | 1940-02-02 | 1940-02-02 | Improvements in or relating to variable-gain thermionic amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB538486A true GB538486A (en) | 1941-08-06 |
Family
ID=9733029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB206940A Expired GB538486A (en) | 1940-02-02 | 1940-02-02 | Improvements in or relating to variable-gain thermionic amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB538486A (en) |
-
1940
- 1940-02-02 GB GB206940A patent/GB538486A/en not_active Expired
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