GB521714A - Improvements in or relating to current-limiting arrangements for indirectly heated valves - Google Patents

Improvements in or relating to current-limiting arrangements for indirectly heated valves

Info

Publication number
GB521714A
GB521714A GB33952/38A GB3395238A GB521714A GB 521714 A GB521714 A GB 521714A GB 33952/38 A GB33952/38 A GB 33952/38A GB 3395238 A GB3395238 A GB 3395238A GB 521714 A GB521714 A GB 521714A
Authority
GB
United Kingdom
Prior art keywords
relay
circuit
valve
alarm
prepares
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
GB33952/38A
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.)
FREDERICK GEORGE FILBY
STC PLC
Original Assignee
FREDERICK GEORGE FILBY
Standard Telephone and Cables PLC
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 FREDERICK GEORGE FILBY, Standard Telephone and Cables PLC filed Critical FREDERICK GEORGE FILBY
Publication of GB521714A publication Critical patent/GB521714A/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
    • 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

Abstract

521,714. Valve circuits. STANDARD TELEPHONES & CABLES, Ltd., and FILBY, F. G. Nov. 22, 1938, No. 33952. [Class 40 (v)] A relay responsive to the voltage across the filaments of indirectly heated valves is used to cut out a series resistance in the filament circuit and to prepare a circuit for an alarm relay which is operated by relays in the valve plate circuits and which prepares the alarm circuit. The relay FR is arranged to energize when the valve filaments FI-F4 have become sufficiently hot for their resistance to be reduced to their normal hot value. The relay at contact FR1 removes resistance R2 from the filament heating circuit and prepares a locking circuit for relay AR which energizes and locks when relay VIR in the plate circuit of valve VI has energized. Relay AR prepares the circuit for alarm relay AL which relay is energized when any one of the anode circuit relays V1R-V4R releases. An additional contact FR3 in the anode supply lead may be provided to ensure the operation of relay FR before the plate circuit relays so that chattering of the alarm relay is prevented.
GB33952/38A 1938-11-22 1938-11-22 Improvements in or relating to current-limiting arrangements for indirectly heated valves Expired GB521714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB231368X 1938-11-22

Publications (1)

Publication Number Publication Date
GB521714A true GB521714A (en) 1940-05-29

Family

ID=10190737

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33952/38A Expired GB521714A (en) 1938-11-22 1938-11-22 Improvements in or relating to current-limiting arrangements for indirectly heated valves

Country Status (4)

Country Link
BE (1) BE437120A (en)
CH (1) CH231368A (en)
GB (1) GB521714A (en)
NL (1) NL55182C (en)

Also Published As

Publication number Publication date
BE437120A (en)
NL55182C (en)
CH231368A (en) 1944-03-15

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