GB240423A - Improvements in or relating to protective systems for thermionic valves - Google Patents

Improvements in or relating to protective systems for thermionic valves

Info

Publication number
GB240423A
GB240423A GB21380/25A GB2138025A GB240423A GB 240423 A GB240423 A GB 240423A GB 21380/25 A GB21380/25 A GB 21380/25A GB 2138025 A GB2138025 A GB 2138025A GB 240423 A GB240423 A GB 240423A
Authority
GB
United Kingdom
Prior art keywords
filament
valves
current
relays
relay
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
Application number
GB21380/25A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric and Manufacturing Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric and Manufacturing Co filed Critical Westinghouse Electric and Manufacturing Co
Publication of GB240423A publication Critical patent/GB240423A/en
Expired legal-status Critical Current

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
    • 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
    • H03F1/542—Replacing by standby devices

Abstract

240,423. Westinghouse Electric & Manufacturing Co., (Assignees of Davis, R. L.). Sept. 23, 1924, [Convention date]. Thermionic generators and modulating systems. -Thermionic valve systems having their respective filaments connected in series are provided with protective devices arranged to substitute automatically an equivalent resistance for any filament that fails to pass the heating-current. Automatic control of the plate supply current is also provided. The filaments of the valves 1 - - 4 are connected in series across the leads 5, 6, and each filament is shunted bv a relay 15 - - 18. When the filaments are intact, these relays do not close their contacts, but on the breakdown of any filament, the corresponding relay is energized and connects an equivalent resistance 19 - - 22 across the broken filament. When once attracted, the contacts remain closed. The plate supply of the valves is controlled bv a relay 30, the circuit of which includes the back contacts of relays 17, 18 in parallel, back contacts of relays 15, 16 in parallel, and contacts controlled by a voltage relay 10 and a current relay 7, respectively in shunt and in series with the filament supply 5, 6. The relays 10, 7 open the plate circuit if the filament voltage, or filament current,.are below normal; and the back contacts of the relays 15 - - 18 open the plate circuit if the filaments of valves 1, 2 fail simultaneously, or if valves 3, 4 fail simulaneously. When the group of valves 1, 2 is used for modulating the output from a group of oscillator valves 3, 4, the system can operate so long as one of the modulators and one of the oscillators are intact, and the plate current is cut off only when both or all the valves of one group are out of action. Filament current may be supplied by a motor generator set, and on starting, the application of plate potential is delayed by the relays 7, 10 until filament voltage and current have built up to their normal values.
GB21380/25A 1924-09-23 1925-08-26 Improvements in or relating to protective systems for thermionic valves Expired GB240423A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US739251A US1749568A (en) 1924-09-23 1924-09-23 Protective system for triodes

Publications (1)

Publication Number Publication Date
GB240423A true GB240423A (en) 1926-07-22

Family

ID=24971467

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21380/25A Expired GB240423A (en) 1924-09-23 1925-08-26 Improvements in or relating to protective systems for thermionic valves

Country Status (2)

Country Link
US (1) US1749568A (en)
GB (1) GB240423A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE967887C (en) * 1954-09-12 1957-12-27 Transformatoren Und App Fabrik Delay circuit for combined radio and television receiver

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2533887A (en) * 1946-09-28 1950-12-12 Rca Corp Station selection apparatus for loran receivers
US2963637A (en) * 1956-12-03 1960-12-06 Hughes Aircraft Co Voltage regulator
US3711739A (en) * 1970-09-08 1973-01-16 Techlite Inc Lighting control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE967887C (en) * 1954-09-12 1957-12-27 Transformatoren Und App Fabrik Delay circuit for combined radio and television receiver

Also Published As

Publication number Publication date
US1749568A (en) 1930-03-04

Similar Documents

Publication Publication Date Title
US2279849A (en) Control of electromagnetic devices
US2157417A (en) Automatic circuit selector
GB240423A (en) Improvements in or relating to protective systems for thermionic valves
US2112228A (en) Signaling apparatus
GB431925A (en) Improvements in or relating to electrical signalling systems
US1719471A (en) Control and supervisory system
GB394067A (en) Improvements in and relating to electric lighting systems
US1758540A (en) Relay system
US2787740A (en) Circuit arrangement for the blocking of circuits in interlocking plants operating with electric lockings
GB448549A (en) Improvements in or relating to electromagnetic relays operated at a low potential
GB387356A (en) Lighting system for self-propelling vehicles
US2603673A (en) Switch means
US2080504A (en) Electrical apparatus
US2573076A (en) Electric sign circuit
US1999781A (en) Control for automobile lighting systems
US1903712A (en) Automatic electric current generating apparatus
US2039516A (en) Apparatus for indicating a nonoperative condition of vehicle lights
US2089838A (en) Electrical relay
US1840077A (en) Indicating system
US2235540A (en) Control system for alternative sources of supply of electric currents
US1760556A (en) Electric braking
GB317018A (en) Improvements in and relating to control circuits
GB783631A (en) Improvements in or relating to electric circuit arrangements for starting and operating low pressure electric discharge lamps
GB462547A (en) Improvements in current supply arrangements for operating electromagnetic relays
GB180984A (en) Improvements relating to systems of electrical distribution