GB624525A - Improvements in thermionic valve amplifiers - Google Patents
Improvements in thermionic valve amplifiersInfo
- Publication number
- GB624525A GB624525A GB3236646A GB3236646A GB624525A GB 624525 A GB624525 A GB 624525A GB 3236646 A GB3236646 A GB 3236646A GB 3236646 A GB3236646 A GB 3236646A GB 624525 A GB624525 A GB 624525A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gain
- stage
- valve
- current
- anode
- 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
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/34—DC amplifiers in which all stages are DC-coupled
- H03F3/36—DC amplifiers in which all stages are DC-coupled with tubes only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
624,525. Valve circuits. YARBOROUGH, E. H. COOKE-. Oct. 31, 1946, No. 32366. [Class 40 (v)] The gain of a thermionic valve amplifier stage is varied by reducing the signal frequency current in part of the anode load resistor whilst maintaining the current in the remainder substantially constant. In this way the change in gain is made substantially independent of the particular valve characteristics and the frequency response of the stage is unaffected by the gain setting. In the Figure, the screen grid of the valve is connected to the junction of the two parts 1, 2 of the anode load resistor, and the suppressor grid may be connected in the " high-gain " position 10 to cathode, when the stage operates in the normal manner. In the " low-gain " position 11 the suppressor is connected at 6 to a source of negative bias of sufficient voltage to cut-off the flow of current to the anode, thereby reducing the gain of the stage. It is shown that the ratio of gain of the stage in these two positions is independent of the mutual-conductance of the valve. The gain of the stage may be remotely controlled by locating the switch 9 at a distance from the valve and the control may be made continuously variable by connecting the suppressorgrid to the movable contact of a potentiometer connected across a bias source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3236646A GB624525A (en) | 1946-10-31 | 1946-10-31 | Improvements in thermionic valve amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3236646A GB624525A (en) | 1946-10-31 | 1946-10-31 | Improvements in thermionic valve amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB624525A true GB624525A (en) | 1949-06-10 |
Family
ID=10337496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3236646A Expired GB624525A (en) | 1946-10-31 | 1946-10-31 | Improvements in thermionic valve amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB624525A (en) |
-
1946
- 1946-10-31 GB GB3236646A patent/GB624525A/en not_active Expired
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