GB485854A - Improvements in or relating to thermionic amplifying systems - Google Patents
Improvements in or relating to thermionic amplifying systemsInfo
- Publication number
- GB485854A GB485854A GB2606736A GB2606736A GB485854A GB 485854 A GB485854 A GB 485854A GB 2606736 A GB2606736 A GB 2606736A GB 2606736 A GB2606736 A GB 2606736A GB 485854 A GB485854 A GB 485854A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- triode
- valve
- amplifier
- 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
Links
- 238000005513 bias potential Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
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
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
485,854. Valve circuits for wireless reception. STANDARD TELEPHONES & CABLES, Ltd., BLACK, D. H., and LAWRENCE, W. Sept. 25, 1936, No. 26067. [Class 40 (v)] A.V.C. in a thermionic amplifier is produced by applying a gain control potential to the grid of a valve the internal impedance of which is common to the output and input circuits of the amplifier and produces a negative feed-back effect. In one embodiment, Fig. 1, feed-back voltages are derived from the junction of a resistance R and the triode portion of a double valve V1, which are connected across the pentode amplifying portion, the impedance of the triode being varied by an A.V.C. voltage applied to its grid. In another embodiment, Fig. 3, a triode V2 forms part of the common cathode impedance of an amplifier valve V1, and is shunted by an inductance L of high impedance to radio signals but of low impedance to the steady bias potential developed across resistance R. In a modification, Fig. 4 (not shown), the " oscillator " portion of a heptode is used as the feed-back triode in the " cathode " circuit of the signal amplifying portion. The amount of negative feed-back in a low-frequency amplifier may be simultaneously controlled. Specification 467,430 is referred to.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE423459D BE423459A (en) | 1936-09-25 | ||
| GB2606736A GB485854A (en) | 1936-09-25 | 1936-09-25 | Improvements in or relating to thermionic amplifying systems |
| NL48810D NL48810C (en) | 1936-09-25 | 1937-09-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2606736A GB485854A (en) | 1936-09-25 | 1936-09-25 | Improvements in or relating to thermionic amplifying systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB485854A true GB485854A (en) | 1938-05-25 |
Family
ID=10237845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2606736A Expired GB485854A (en) | 1936-09-25 | 1936-09-25 | Improvements in or relating to thermionic amplifying systems |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE423459A (en) |
| GB (1) | GB485854A (en) |
| NL (1) | NL48810C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2610260A (en) * | 1946-12-31 | 1952-09-09 | Rca Corp | Signal gain control circuits |
| US2739189A (en) * | 1950-07-12 | 1956-03-20 | Rca Corp | Grounded grid u. h. f. amplifier with gain control and constant input impedance |
-
0
- BE BE423459D patent/BE423459A/xx unknown
-
1936
- 1936-09-25 GB GB2606736A patent/GB485854A/en not_active Expired
-
1937
- 1937-09-25 NL NL48810D patent/NL48810C/xx active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2610260A (en) * | 1946-12-31 | 1952-09-09 | Rca Corp | Signal gain control circuits |
| US2739189A (en) * | 1950-07-12 | 1956-03-20 | Rca Corp | Grounded grid u. h. f. amplifier with gain control and constant input impedance |
Also Published As
| Publication number | Publication date |
|---|---|
| NL48810C (en) | 1940-02-15 |
| BE423459A (en) |
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