FR704309A - Improvements to thermionic valve systems - Google Patents

Improvements to thermionic valve systems

Info

Publication number
FR704309A
FR704309A FR704309DA FR704309A FR 704309 A FR704309 A FR 704309A FR 704309D A FR704309D A FR 704309DA FR 704309 A FR704309 A FR 704309A
Authority
FR
France
Prior art keywords
valve systems
thermionic valve
thermionic
systems
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
Other languages
French (fr)
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.)
Parlophone Records Ltd
Original Assignee
Gramophone 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 Gramophone Co Ltd filed Critical Gramophone Co Ltd
Application granted granted Critical
Publication of FR704309A publication Critical patent/FR704309A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/02—Manually-operated control
    • H03G3/14—Manually-operated control in frequency-selective amplifiers
    • H03G3/16—Manually-operated control in frequency-selective amplifiers having discharge tubes
FR704309D 1929-12-21 1930-10-24 Improvements to thermionic valve systems Expired FR704309A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB704309X 1929-12-21

Publications (1)

Publication Number Publication Date
FR704309A true FR704309A (en) 1931-05-18

Family

ID=10493932

Family Applications (1)

Application Number Title Priority Date Filing Date
FR704309D Expired FR704309A (en) 1929-12-21 1930-10-24 Improvements to thermionic valve systems

Country Status (1)

Country Link
FR (1) FR704309A (en)

Similar Documents

Publication Publication Date Title
FR680894A (en) Improvements to refrigeration systems
FR637801A (en) Improvements to television systems
FR654076A (en) Improvements to television systems
FR33164E (en) Improvements to control systems
FR704587A (en) Improvements to filtration systems
FR701306A (en) Improvements to television systems
FR704309A (en) Improvements to thermionic valve systems
FR696558A (en) Improvements to telephone systems
FR609383A (en) Improvements to control systems
FR654751A (en) Improvements to television systems
FR654754A (en) Improvements to television systems
FR694716A (en) Improvements to telephone systems
FR652125A (en) Improvements to television systems
FR679962A (en) Improvements to take change systems
FR723847A (en) Improvements to refrigeration systems
FR728543A (en) Improvements to locking systems
FR671317A (en) Improvements to telephone systems
FR714245A (en) Improvements to telephone systems
FR703958A (en) Improvements to telephone systems
FR642998A (en) Improvements to radiotelegraph communications systems
FR699117A (en) Improvements to television systems
FR726997A (en) Improvements to telegraph systems
FR682587A (en) Improvements to servo-motor brake systems
FR684440A (en) Improvements to radio-receiver systems
FR684571A (en) Improvements to transmission systems