GB539859A - Improvements in or relating to thermionic amplifiers - Google Patents
Improvements in or relating to thermionic amplifiersInfo
- Publication number
- GB539859A GB539859A GB349140A GB349140A GB539859A GB 539859 A GB539859 A GB 539859A GB 349140 A GB349140 A GB 349140A GB 349140 A GB349140 A GB 349140A GB 539859 A GB539859 A GB 539859A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- amplifier
- input
- anode
- impedance
- 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
- 230000007423 decrease Effects 0.000 abstract 2
- 230000004075 alteration Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/76—Wired systems
- H04H20/82—Wired systems using signals not modulated onto a carrier
- H04H20/83—Wired systems using signals not modulated onto a carrier not sharing the network with any other service
-
- 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)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
539,859. Valve amplifying circuits. COOPER, A. H. Feb. 24, 1940, No. 3491. [Class 40 (v)] [Also in Group XXXIX] In an amplifier for a music-distributing system, the 'input circuit includes a potential divider consisting of fixed resistances 14, 7 and the anode-cathode space of a valve 11 which is adjusted in accordance with the output current so that when the latter decreases, because of a reduction of the number of listeners and consequent increase in the impedance of the load, the input to the amplifier decreases also. Preferably this effect is produced only when the impedance of the load is comparatively low. When it is high, the control voltage produced by the diode 12, which rectifies a portion of the output current, is neutralized by a valve 15 which shunts away the control voltage at each peak of signal current. When the input to the amplifier is reduced, its bias is increased by the alteration of the voltage drop in resistance 7 so as to reduce its anode dissipation. Modifications are described in which a preliminary amplifier uses the same anode supply as the valve 11, Fig. 3 (not shown), and in which the valve 11 is a variable-n pentode, Fig. 4 (not shown).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB349140A GB539859A (en) | 1940-02-24 | 1940-02-24 | Improvements in or relating to thermionic amplifiers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB349140A GB539859A (en) | 1940-02-24 | 1940-02-24 | Improvements in or relating to thermionic amplifiers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB539859A true GB539859A (en) | 1941-09-26 |
Family
ID=9759328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB349140A Expired GB539859A (en) | 1940-02-24 | 1940-02-24 | Improvements in or relating to thermionic amplifiers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB539859A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2999210A (en) * | 1956-11-30 | 1961-09-05 | Korting Radio Werke G M B H | Automatic volume expander |
-
1940
- 1940-02-24 GB GB349140A patent/GB539859A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2999210A (en) * | 1956-11-30 | 1961-09-05 | Korting Radio Werke G M B H | Automatic volume expander |
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