GB624886A - Improvements in or relating to circuit-arrangements for the expansion of electrical oscillations - Google Patents
Improvements in or relating to circuit-arrangements for the expansion of electrical oscillationsInfo
- Publication number
- GB624886A GB624886A GB33290/46A GB3329046A GB624886A GB 624886 A GB624886 A GB 624886A GB 33290/46 A GB33290/46 A GB 33290/46A GB 3329046 A GB3329046 A GB 3329046A GB 624886 A GB624886 A GB 624886A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control
- valve
- grid
- voltage
- grids
- 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
Landscapes
- Amplifiers (AREA)
Abstract
624,886. Valve amplifying circuits. PHILIPS LAMPS, Ltd. Nov. 8, 1946, No. 33290. Convention date, May 6, 1943. [Classes 40 (v) and 40 (vi)] In an expander circuit using a valve having at least two control grids and two screen grids, the signal and a voltage dependent of the signal amplitude each being applied to a different control grid, a circuit common to the screen grids includes a resistance of such size that the mutual conductance of the valve increases with an increase in the negative control voltage. As shown, the signal is applied to the first control grid of a heptode valve 5. Part of the output is rectified by a diode 15 to give a negative control voltage which is applied to the second control grid of valve 5 through a filter 19. The screen grids are connected to the H.T. supply through a common resistance 17 of such size that the mutual conductance of the valve increases with an increase in the negative control voltage. The control voltage and the signal input may both be applied to the second control grid, Fig. 4 (not shown). In a further modification, Fig. 5 (not shown), the signal input and the control voltage are applied to the first and second control grids respectively, and an amplified signal is taken from the first screen grid and applied to the second control grid via the second screen grid and a voltage divider. The invention enables the cathode of the control rectifier to be at the same potential as the cathode of the amplifier. Negative feedback may be used to reduce distortion.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL624886X | 1943-05-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB624886A true GB624886A (en) | 1949-06-17 |
Family
ID=19788530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33290/46A Expired GB624886A (en) | 1943-05-06 | 1946-11-08 | Improvements in or relating to circuit-arrangements for the expansion of electrical oscillations |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB624886A (en) |
-
1946
- 1946-11-08 GB GB33290/46A patent/GB624886A/en not_active Expired
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