GB758857A - Improvements relating to thermionic valve circuits - Google Patents
Improvements relating to thermionic valve circuitsInfo
- Publication number
- GB758857A GB758857A GB693354A GB693354A GB758857A GB 758857 A GB758857 A GB 758857A GB 693354 A GB693354 A GB 693354A GB 693354 A GB693354 A GB 693354A GB 758857 A GB758857 A GB 758857A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- resistor
- filaments
- bridge
- current
- 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
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
- H03F1/544—Protection of filaments
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Optical Communication System (AREA)
Abstract
758,857. Unattended repeaters. SIEMENS BROS. & CO., Ltd. March 4, 1955 [March 10, 1954], No. 6933/54. Class 40 (4). [Also in Group XL (c)] The filaments of a valve provided with duplicate filaments or heaters are connected with resistors in a bridge circuit so that if either filament fails the other provides full energization of the valve. The arrangement is more particularly intended for unattended repeaters, e.g. in a submarine or subterranean cable. In an arrangement for a constant current filament supply, the current normally divides, one half passing through resistor R1 and filament H2 and the other half through filament H1 and resistor R2. The bridge is balanced so that bridging resistor R3 normally carries no current. If one filament, e.g. H1, fails, the circuit reduces to a series resistor, e.g. R1 in series with the operative filament, e.g. H2, in shunt with resistors, e.g. R2, R3. The value of the bridging resistor R3 is so chosen that the remaining operative filament then dissipates the same amount of energy as the two filaments in normal operation. In a circuit for operation from a constant voltage source. Fig. 2 (not shown), the bridge is arranged with the two filaments in adjacent arms, their common point being connected to one of the supply lines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB693354A GB758857A (en) | 1954-03-10 | 1954-03-10 | Improvements relating to thermionic valve circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB693354A GB758857A (en) | 1954-03-10 | 1954-03-10 | Improvements relating to thermionic valve circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB758857A true GB758857A (en) | 1956-10-10 |
Family
ID=9823497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB693354A Expired GB758857A (en) | 1954-03-10 | 1954-03-10 | Improvements relating to thermionic valve circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB758857A (en) |
-
1954
- 1954-03-10 GB GB693354A patent/GB758857A/en not_active Expired
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