GB647285A - D.c. amplifier - Google Patents
D.c. amplifierInfo
- Publication number
- GB647285A GB647285A GB7880/48A GB788048A GB647285A GB 647285 A GB647285 A GB 647285A GB 7880/48 A GB7880/48 A GB 7880/48A GB 788048 A GB788048 A GB 788048A GB 647285 A GB647285 A GB 647285A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pentodes
- amplifier
- frequency
- fed
- coupled
- 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
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/38—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
- H03F3/40—DC amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with tubes only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microwave Amplifiers (AREA)
- Amplifiers (AREA)
Abstract
647,285. Valve amplifying and modulating circuits. DU MONT LABORATORIES, Inc., A. B. March 16, 1948, No. 7880. Convention date, May 8, 1947. Drawings to Specification. [Classes 40 (v) and 40 (vi)] An amplifier for low-amplitude signals of frequency from zero to 50 kc/s. comprises push-pull input pentodes adjustable to slight unbalance by a variable tapped common resistor between their screen grids, and D.C. coupled to cathode follower valves, feeding in push-pull two balanced modulator Class B pentodes with common tuned anode circuit to the grids of which a carrier frequency is fed in parallel. The output may then be fed to a pushpull D.C. amplifier and frequency changed if necessary and amplified before passing to a detector and D.C. coupled output stage. The percentage modulation of the carrier is controlled by the variable resistor. In a modification the cathode followers preceding the modulator pentodes are omitted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US746750A US2445938A (en) | 1947-05-08 | 1947-05-08 | Direct-current amplifier |
Publications (1)
Publication Number | Publication Date |
---|---|
GB647285A true GB647285A (en) | 1950-12-13 |
Family
ID=25002176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7880/48A Expired GB647285A (en) | 1947-05-08 | 1948-03-16 | D.c. amplifier |
Country Status (2)
Country | Link |
---|---|
US (1) | US2445938A (en) |
GB (1) | GB647285A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2519256A (en) * | 1948-10-28 | 1950-08-15 | Westinghouse Electric Corp | High fidelity modulator |
US2693578A (en) * | 1952-01-09 | 1954-11-02 | Western Electric Co | Modulator system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1977536A (en) * | 1932-11-25 | 1934-10-16 | Ernest A Tubbs | Electrical system |
US2076787A (en) * | 1935-12-24 | 1937-04-13 | Wired Radio Inc | Variable carrier system |
US2346020A (en) * | 1942-02-05 | 1944-04-04 | Rca Corp | Modulation amplifier and modulator |
-
1947
- 1947-05-08 US US746750A patent/US2445938A/en not_active Expired - Lifetime
-
1948
- 1948-03-16 GB GB7880/48A patent/GB647285A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2445938A (en) | 1948-07-27 |
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