GB252181A - Improvements in protective devices, particularly intended for thermionic valve apparatus - Google Patents

Improvements in protective devices, particularly intended for thermionic valve apparatus

Info

Publication number
GB252181A
GB252181A GB12278/26A GB1227826A GB252181A GB 252181 A GB252181 A GB 252181A GB 12278/26 A GB12278/26 A GB 12278/26A GB 1227826 A GB1227826 A GB 1227826A GB 252181 A GB252181 A GB 252181A
Authority
GB
United Kingdom
Prior art keywords
filament
batteries
leads
short
thermionic valve
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
GB12278/26A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB252181A publication Critical patent/GB252181A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

252,181. British Thomson-Houston Co., Ltd., (Assignees of Whelan, D. 0.). May 13, 1925, [Convention date]. Thermionic valve circuits.-A safety device for preventing excess current and indicating the occurrence of a short-circuit in connection with the batteries of a thermionic valve system comprises a. tungsten lamp or like device having a low resistance under normal conditions but a high resistance when passing abnormally higher current. Thus a lamp comprising a tungsten filament in an atmosphere of hydrogen or other inert gas may be connected as shown in Fig. 1, the terminals of the filament 6, 7 being connected to poles of the batteries 2, 3, while the middle point of the filament and the remaining poles of the batteries are respectively connected in two of the circuits of the apparatus. Should the leads 20, 21 be short-circuited the half 6 of the filament indicates the fact by glowing, its resistance at the same time increasing so as to prevent excessive current flow. Should the leads 20, 22 be short-circuited the whole filament comes into action. The ends of the filament are connected through leads of the usual type to terminals of which one is shown at 12, Fig. 2, while the middle point of the filament is connected to an additional terminal 13 on the cap 14.
GB12278/26A 1925-05-13 1926-05-12 Improvements in protective devices, particularly intended for thermionic valve apparatus Expired GB252181A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US30029A US1585450A (en) 1925-05-13 1925-05-13 Protective apparatus

Publications (1)

Publication Number Publication Date
GB252181A true GB252181A (en) 1927-06-16

Family

ID=21852160

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12278/26A Expired GB252181A (en) 1925-05-13 1926-05-12 Improvements in protective devices, particularly intended for thermionic valve apparatus

Country Status (4)

Country Link
US (1) US1585450A (en)
DE (1) DE475134C (en)
GB (1) GB252181A (en)
NL (1) NL18060C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3165571A (en) * 1961-06-20 1965-01-12 Westinghouse Electric Corp Automatic current regulator

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE966205C (en) * 1944-07-22 1957-07-25 Siemens Ag Device for regulating high-frequency generators
US3101453A (en) * 1957-01-21 1963-08-20 Modern Telephones Great Britai Transistor amplifiers with protective circuit means
US3263172A (en) * 1963-06-20 1966-07-26 Motorola Inc Transistor transmitter output amplifier protection means

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3165571A (en) * 1961-06-20 1965-01-12 Westinghouse Electric Corp Automatic current regulator

Also Published As

Publication number Publication date
US1585450A (en) 1926-05-18
NL18060C (en)
DE475134C (en) 1929-04-19

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