GB651478A - Improvements in or relating to thermionic valve circuits for deriving two equal voltages of opposite phase - Google Patents
Improvements in or relating to thermionic valve circuits for deriving two equal voltages of opposite phaseInfo
- Publication number
- GB651478A GB651478A GB32420/47A GB3242047A GB651478A GB 651478 A GB651478 A GB 651478A GB 32420/47 A GB32420/47 A GB 32420/47A GB 3242047 A GB3242047 A GB 3242047A GB 651478 A GB651478 A GB 651478A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- anode
- screen
- circuit
- input
- 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
- 230000003472 neutralizing effect Effects 0.000 abstract 1
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
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/26—Push-pull amplifiers; Phase-splitters therefor
- H03F3/28—Push-pull amplifiers; Phase-splitters therefor with tubes only
-
- 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
651,478. Valve amplifying circuits; automatic gain control. PHILIPS ELECTRICAL, Ltd. Dec. 9, 1947, No. 32420. Convention date, Sept. 13, 1946. [Classes 40 (v) and 40 (vi)] A circuit for deriving a push - pull output from a single-ended source comprises a hexode valve 1, with the input applied to the third grid, and the outputs taken from the anode and interconnected screen (second and fourth) grids respectively. The screen grid circuit includes an impedance 2 of such value that the anode current/first grid volts characteristic has a negative slope and a positive feed-back circuit 5, 3, 4 is provided between the anode and the first grid. A control voltage may be applied to the third grid, and a corresponding voltage of lower amplitude and opposite sign may be applied to the first grid. As shown, diodes 7, 8 are connected to give contrast expansion. A neutralizing condenser may be connected between the anode and third grid and negative feed-back may be provided between the anode and third grid and between the screen grids and the first grid, Fig. 3 (not shown). The screen circuit may include a frequency-sensitive impedance of such value that the anode current/input volts characteristic has zero slope for an undesired frequency. The input may be applied to the first grid.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL265677X | 1946-09-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB651478A true GB651478A (en) | 1951-04-04 |
Family
ID=19781709
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB32420/47A Expired GB651478A (en) | 1946-09-13 | 1947-12-09 | Improvements in or relating to thermionic valve circuits for deriving two equal voltages of opposite phase |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE478056A (en) |
CH (1) | CH265677A (en) |
DE (1) | DE808958C (en) |
FR (1) | FR955048A (en) |
GB (1) | GB651478A (en) |
-
0
- FR FR955048D patent/FR955048A/fr not_active Expired
- BE BE478056D patent/BE478056A/xx unknown
-
1947
- 1947-11-18 CH CH265677D patent/CH265677A/en unknown
- 1947-12-09 GB GB32420/47A patent/GB651478A/en not_active Expired
-
1948
- 1948-11-04 DE DEP20534D patent/DE808958C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE478056A (en) | |
DE808958C (en) | 1951-07-23 |
FR955048A (en) | 1950-01-07 |
CH265677A (en) | 1949-12-15 |
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