GB417440A - Improvements in or relating to thermionic amplifiers - Google Patents
Improvements in or relating to thermionic amplifiersInfo
- Publication number
- GB417440A GB417440A GB16280/34A GB1628034A GB417440A GB 417440 A GB417440 A GB 417440A GB 16280/34 A GB16280/34 A GB 16280/34A GB 1628034 A GB1628034 A GB 1628034A GB 417440 A GB417440 A GB 417440A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- rectifier
- amplifier
- filament
- condensers
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G7/00—Volume compression or expansion in amplifiers
- H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
-
- 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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/04—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in discharge-tube amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Microwave Tubes (AREA)
- Hybrid Cells (AREA)
Abstract
417,440. Valve amplifying circuits. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. May 31, 1934, No. 16280. Convention date, June 20, 1933. Addition to 388,292. [Classes 39 (i) and 40 (v).] An amplifier of the kind described in the parent Specification, in which grid bias is automatically adjusted according to signal volume with the object of saving plate current, is modified by arranging the rectifier in one of the amplifying valves, preferably a valve in an earlier stage of the amplifier. As shown, part of the output across a choke coil 9 or transformer in the final stage 1 of the amplifier, is fed through condensers 26, 27 and resistance 28 to a rectifier formed by an anode 25 and a cathode 23 heated by the filament of an earlier valve 2. The resulting D.C. voltage across the resistance 28 is smoothed by condensers 31, 32 and is applied to the grid of the valve 1 in opposition to the voltage of a battery 33 thus giving high negative bias when the signals are weak and less bias as the signals increase. The cathode 23 may be heated by a separate filament connected in parallel with the main filament of the valve 2 ; or the main filament may form a directly-heated cathode for the rectifier. A resistance 29 is connected across the rectifying circuit. In a modification, a push-pull pair of valves is employed in the output stage. An inductance coil may be connected in series in the rectifier circuit to diminish the frequency-discriminating effect of the series condensers 26, 27.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL61083A NL40011C (en) | 1932-04-30 | 1932-04-30 | |
| DEN35376D DE656476C (en) | 1932-04-30 | 1933-06-21 | Amplifier system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB417440A true GB417440A (en) | 1934-10-04 |
Family
ID=34066211
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20320/32A Expired GB388292A (en) | 1932-04-30 | 1932-07-18 | Improvements in or relating to thermionic amplifying arrangements |
| GB16280/34A Expired GB417440A (en) | 1932-04-30 | 1934-05-31 | Improvements in or relating to thermionic amplifiers |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB20320/32A Expired GB388292A (en) | 1932-04-30 | 1932-07-18 | Improvements in or relating to thermionic amplifying arrangements |
Country Status (8)
| Country | Link |
|---|---|
| US (2) | US2120995A (en) |
| AT (1) | AT144736B (en) |
| CH (2) | CH169190A (en) |
| DE (2) | DE654641C (en) |
| DK (1) | DK50062C (en) |
| FR (2) | FR753235A (en) |
| GB (2) | GB388292A (en) |
| NL (2) | NL40011C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2563773A (en) * | 1946-07-30 | 1951-08-07 | Sonotone Corp | Audio-frequency amplifier |
| US2466018A (en) * | 1946-08-02 | 1949-04-05 | Sperry Corp | Vibratory strand reference apparatus with longitudinal component drive |
| US2552586A (en) * | 1947-02-19 | 1951-05-15 | Thomas A Read | Automatic volume control |
| BE560458A (en) * | 1954-02-08 | |||
| NL267845A (en) * | 1959-04-27 | 1900-01-01 |
-
1932
- 1932-04-30 NL NL61083A patent/NL40011C/xx active
- 1932-07-18 GB GB20320/32A patent/GB388292A/en not_active Expired
-
1933
- 1933-01-23 US US652996A patent/US2120995A/en not_active Expired - Lifetime
- 1933-02-22 DE DEN34923D patent/DE654641C/en not_active Expired
- 1933-03-27 CH CH169190D patent/CH169190A/en unknown
- 1933-03-28 FR FR753235D patent/FR753235A/en not_active Expired
- 1933-06-21 DE DEN35376D patent/DE656476C/en not_active Expired
-
1934
- 1934-04-03 US US718784A patent/US2083626A/en not_active Expired - Lifetime
- 1934-05-09 DK DK50062D patent/DK50062C/en active
- 1934-05-31 CH CH175922D patent/CH175922A/en unknown
- 1934-05-31 GB GB16280/34A patent/GB417440A/en not_active Expired
- 1934-06-01 AT AT144736D patent/AT144736B/en active
- 1934-06-01 FR FR44893D patent/FR44893E/en not_active Expired
- 1934-06-14 NL NL69774A patent/NL43096C/xx active
Also Published As
| Publication number | Publication date |
|---|---|
| GB388292A (en) | 1933-02-23 |
| US2083626A (en) | 1937-06-15 |
| DE654641C (en) | 1937-12-28 |
| AT144736B (en) | 1936-02-25 |
| CH169190A (en) | 1934-05-15 |
| DE656476C (en) | 1938-02-07 |
| FR44893E (en) | 1935-04-24 |
| US2120995A (en) | 1938-06-21 |
| NL43096C (en) | 1938-05-16 |
| CH175922A (en) | 1935-03-15 |
| DK50062C (en) | 1935-03-25 |
| FR753235A (en) | 1933-10-10 |
| NL40011C (en) | 1937-02-15 |
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