GB559258A - Vacuum tube amplifying apparatus - Google Patents

Vacuum tube amplifying apparatus

Info

Publication number
GB559258A
GB559258A GB12840/42A GB1284042A GB559258A GB 559258 A GB559258 A GB 559258A GB 12840/42 A GB12840/42 A GB 12840/42A GB 1284042 A GB1284042 A GB 1284042A GB 559258 A GB559258 A GB 559258A
Authority
GB
United Kingdom
Prior art keywords
screen grid
valve
amplifying apparatus
sept
condenser
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
GB12840/42A
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.)
STC PLC
Original Assignee
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB559258A publication Critical patent/GB559258A/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
    • H03F1/542—Replacing by standby devices

Abstract

559,258. Caps and holders for thermionic valves. STANDARD TELEPHONES & CABLES, Ltd. Sept..11, 1942, No. 12840. Convention date, Sept. 17, 1941. [Class 38 (i)] [Also in Group XL] In amplifying apparatus in which a second valve holder is wired in parallel so that the valves may be removed for testing without interrupting the signalling circuit means are provided for so controlling the screen grid potential as to avoid the production of transients. The screen grid is connected to two pins 70, 71 of different length and a series resistance and shunt condenser are so arranged that during removal of a valve the screen grid potential is slowly decreased and when a valve is inserted this potential increases slowly as the condenser is charged through the resistance. Alternatively the socket co-operating with the pin 70 may be shortened to ensure the required sequence of operations. U.S.A. Specification 2,102,671 is referred to.
GB12840/42A 1941-09-17 1942-09-11 Vacuum tube amplifying apparatus Expired GB559258A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US559258XA 1941-09-17 1941-09-17

Publications (1)

Publication Number Publication Date
GB559258A true GB559258A (en) 1944-02-10

Family

ID=22001054

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12840/42A Expired GB559258A (en) 1941-09-17 1942-09-11 Vacuum tube amplifying apparatus

Country Status (1)

Country Link
GB (1) GB559258A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775657A (en) * 1951-04-19 1956-12-25 Hartford Nat Bank & Trust Co Dual channel amplifying circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775657A (en) * 1951-04-19 1956-12-25 Hartford Nat Bank & Trust Co Dual channel amplifying circuit

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