EP0257278A1 - Shield grid electron tube, particularly a high power, high frequency emitting tetrode - Google Patents
Shield grid electron tube, particularly a high power, high frequency emitting tetrode Download PDFInfo
- Publication number
- EP0257278A1 EP0257278A1 EP87110165A EP87110165A EP0257278A1 EP 0257278 A1 EP0257278 A1 EP 0257278A1 EP 87110165 A EP87110165 A EP 87110165A EP 87110165 A EP87110165 A EP 87110165A EP 0257278 A1 EP0257278 A1 EP 0257278A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screen grid
- electron tube
- screen
- tetrode
- grid connection
- 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.)
- Granted
Links
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 2
- KGWWEXORQXHJJQ-UHFFFAOYSA-N [Fe].[Co].[Ni] Chemical compound [Fe].[Co].[Ni] KGWWEXORQXHJJQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
- H01J19/28—Non-electron-emitting electrodes; Screens
- H01J19/38—Control electrodes, e.g. grid
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
- H01J19/74—Cooling arrangements
Definitions
- the invention relates to a screen grid electron tube according to the preamble of claim 1.
- Transmitter tubes have also become known whose screen grille connection contains an integrated water cooling coil instead of air cooling (NTG Technical Reports 85, 1983, pages 128 to 132, published by VDE Verlag, Berlin, ISBN 3-8007-1321-7).
- NVG Technical Reports 85, 1983, pages 128 to 132, published by VDE Verlag, Berlin, ISBN 3-8007-1321-7 NVG Technical Reports 85, 1983, pages 128 to 132, published by VDE Verlag, Berlin, ISBN 3-8007-1321-7.
- this cooling device makes changing the tubes difficult and time-consuming.
- the invention has for its object to reduce the heat loss occurring at the tube connections, in particular at the screen grid connection, to improve the heat dissipation and thus to provide an effective tube cooling associated with little technological effort.
- a complete separation of the HF currents of the anode shield grid space and the control grid shield grid space is to be achieved.
- two separate screen grid connection elements are provided for an electron tube, in particular a transmission tetrode.
- the first implementation consists of a good thermally conductive material with low RF losses. Due to its construction and its physical properties, this material can be cooled well. Another advantage is that the system length caused by the electrical wavelength can be kept short regardless of mechanical requirements.
- the second implementation is used for the mechanical construction, fastening the screen grille and closing the vacuum envelope. When selecting the material, the mechanical stress and the thermal expansion of the screen grille attached to it by screwing are taken into account.
- a major advantage is that the double screen grille leads to cooling air that can be used to control the permissible temperatures of the tube.
- the transmitting tetrode essentially has a coaxial structure of the electrodes, namely the cathode, the control grid, the screen grid and the anode and their bushings.
- the connection of the screen grid 5 consists of two annular screen grid connection elements (contact rings) 1 and 2 spaced apart from one another in the axial direction. These two screen screens teranschlußetti 1, 2 form together with their associated bushings 3, 4 a coaxial cooling air duct (cooling air duct), the course of which is indicated by arrows 7.
- the ring-shaped screen grid connection elements 1, 2 consist of a metal or an alloy of high thermal conductivity, preferably of copper.
- the first bushing 3 in turn consists of a good heat-conducting material, namely one with low RF losses, preferably copper.
- the second bushing 4 consists of a mechanically stable material, the coefficient of thermal expansion of which is adapted to that of the metal-ceramic material which is preferably used as the vacuum envelope 6.
- An iron-cobalt-nickel alloy is particularly suitable as the material for the second bushing 4 in order to obtain a vacuum-tight metal-ceramic connection of the vacuum envelope 6.
- the ceramic material serves as an insulation gap between the individual metal-ceramic connections or bushings of the tetrode.
- the screen grid 5 is fastened to the second bushing 4 by means of a screw connection 8.
- the contact springs 9 attached to the outside of the screen grid connection elements (contact rings) 1, 2 in the form of a screen grid spring ring allow an almost unimpaired coaxial cooling air flow in the direction of the arrows 7.
Landscapes
- Microwave Tubes (AREA)
- Installation Of Indoor Wiring (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Microwave Amplifiers (AREA)
- Amplifiers (AREA)
Abstract
Die Erfindung bezieht sich auf eine Schirmgitterelektronenröhre, insbesondere Sendetetrode hoher Leistung und hoher Frequenzen, mit koaxialem Aufbau der Elektroden sowie deren Durchführungen und luftgekühltem Schirmgitteranschluß. Bei dieser Elektronenröhre soll die insbesondere am Schirmgitteranschluß auftretende Verlustwärme verringert, die Wärmeabfuhr verbessert und eine mit geringem technologischen Aufwand verbundene effektive Röhrenkühlung geschaffen werden. Die Erfindung sieht hierzu vor, daß der Schirmgitteranschluß aus zwei in axialer Richtung beabstandeten ringförmigen Schirmgitteranschlußelementen (1, 2) besteht, die zusammen mit ihren Durchführungen (3, 4) im Bereich der Schirmgitteranschlußelemente (1, 2) eine koaxiale Kühlluftführung (7) bilden. Die erfindungsgemäße Schirmgitterelektronenröhre findet insbesondere als Sendetetrode in Hochfrequenzröhren-Leistungsverstärkern Anwendung.The invention relates to a screen grid electron tube, in particular a transmission tetrode of high power and high frequencies, with a coaxial structure of the electrodes and their bushings and air-cooled screen grid connection. With this electron tube, the heat loss occurring in particular at the screen grid connection is to be reduced, the heat dissipation is to be improved and an effective tube cooling system is to be created which involves little technological effort. The invention provides for the screen grille connection to consist of two annular screen grille connection elements (1, 2) spaced apart in the axial direction, which together with their bushings (3, 4) form a coaxial cooling air guide (7) in the area of the screen grille connection elements (1, 2) . The screen grid electron tube according to the invention is used in particular as a transmission tetrode in high-frequency tube power amplifiers.
Description
Die Erfindung bezieht sich auf eine Schirmgitterelektronenröhre gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a screen grid electron tube according to the preamble of claim 1.
Beim Betrieb von Elektronenröhren bei hohen Frequenzen treten zusätzliche Verluste auf, die durch Hochfrequenzströme hervorgerufen werden. Dies ist besonders der Fall, wenn Senderöhren mit hohen Anodenwechselspannungen betrieben werden. Die durch die Anodenwechselspannung gespeisten Hochfrequenzströme erzeugen im Gitter-Anodenraum auf den Zuführungen und den Elektroden Verluste, die durch spezielle Kühlung abgeführt werden müssen.When operating electron tubes at high frequencies, additional losses occur which are caused by high-frequency currents. This is particularly the case when transmitter tubes are operated with high anode AC voltages. The high-frequency currents fed by the anode alternating voltage generate losses in the grid anode space on the leads and the electrodes, which have to be dissipated by special cooling.
Bei Hochfrequenzröhren-Leistungsverstärkern mit Frequenzen von 100MHz bis 1000MHz, d.h. im VHF- bzw. UHF-Bereich, insbesondere im IV/V-Bereich, stellt die Kühlung der Röhrenanschlüsse immer ein erhebliches Problem dar. Bei einem Betrieb bei hohen Frequenzen müssen die Röhren möglichst kurz und kompakt beschaffen sein, wodurch allerdings die Wärmeabfuhr immer schwieriger wird.For high-frequency tube power amplifiers with frequencies from 100MHz to 1000MHz, i.e. In the VHF and UHF range, especially in the IV / V range, the cooling of the tube connections is always a significant problem. When operating at high frequencies, the tubes must be as short and compact as possible, which, however, makes heat dissipation more and more difficult becomes.
Insbesondere sind bei Hochleistungsröhren für Sender im IV/V-(UHF-)Bereich die Abmessungen (Systemlänge und Zuführungslänge) bedingt durch die elektrische Wellenlänge sehr kurz. Außerdem ist die Wärmeleitfähigkeit der in der Röhrentechnologie verbreiteten Werkstoffe so hoch, daß über die Anschlüsse eine Wärmeabfuhr stattfindet und daher entsprechend gekühlt werden muß.In the case of high-performance tubes for transmitters in the IV / V (UHF) range in particular, the dimensions (system length and feed length) are very short due to the electrical wavelength. In addition, the thermal conductivity of the materials widely used in tube technology is so high that heat is dissipated via the connections and must therefore be cooled accordingly.
Bei Verwendung von Hochleistungstetroden in Leistungsverstärkern (Topfkreisen) stellt die Kühlung des Schirmgitteranschlusses immer besondere konstruktive und kühltechnische Anforderungen an den Anwender.When using high-performance tetrodes in power amplifiers (pot circles), the cooling of the screen grid connection always places special design and cooling requirements on the user.
Es ist bekannt, im Hinblick auf die bei hohen Frequenzen ansteigenden Hochfrequenzverluste zur forcierten Luftkühlung des Schirmgitteranschlußringes diesen Teil der Röhre mit einer besonderen Kühlluftführung zu versehen. Zwei an diesem Kühlluftkanal beiderseits der Anschlußfläche angebrachte Reihen von rechteckigen Öffnungen dienen dabei dem Luftein- und austritt (Senderöhren-Datenbuch 1980/81, S.147, heraugegeben von Siemens AG, Bereich Bauelemente, München, Bundesrepublik Deutschland).It is known to provide this part of the tube with a special cooling air duct in view of the high-frequency losses at high frequencies for forced air cooling of the screen grille connecting ring. Two rows of rectangular openings attached to this cooling air duct on both sides of the connection area serve for the air inlet and outlet (transmitter tube data book 1980/81, p.147, published by Siemens AG, Components Department, Munich, Federal Republic of Germany).
Es sind auch Senderöhren bekannt geworden, deren Schirmgitteranschluß anstatt einer Luftkühlung eine integrierte Wasserkühlschlange enthält (NTG-Fachberichte 85, 1983, Seiten 128 bis 132, erschienen im VDE-Verlag, Berlin, ISBN 3-8007-1321-7). Diese Kühlvorrichtung macht allerdings einen Röhrenwechsel schwierig und zeitaufwendig.Transmitter tubes have also become known whose screen grille connection contains an integrated water cooling coil instead of air cooling (NTG Technical Reports 85, 1983, pages 128 to 132, published by VDE Verlag, Berlin, ISBN 3-8007-1321-7). However, this cooling device makes changing the tubes difficult and time-consuming.
Der Erfindung liegt die Aufgabe zugrunde, die an den Röhrenanschlüssen, insbesondere am Schirmgitteranschluß auftretende Verlustwärme zu verringern, die Wärmeabfuhr zu verbessern und somit eine mit geringem technologischen Aufwand verbundene effektive Röhrenkühlung zu schaffen. Außerdem soll eine vollkommene Trennung der HF-Ströme des AnodenSchirmgitter-Raumes und des Steuergitter-Schirmgitter-Raumes erzielt werden.The invention has for its object to reduce the heat loss occurring at the tube connections, in particular at the screen grid connection, to improve the heat dissipation and thus to provide an effective tube cooling associated with little technological effort. In addition, a complete separation of the HF currents of the anode shield grid space and the control grid shield grid space is to be achieved.
Diese Aufgabe wird erfindungsgemäß durch eine Schirmgitterelektronenröhre mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the invention by a screen grid electron tube with the features of claim 1.
Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand zusätzlicher Ansprüche.Advantageous refinements and developments of the invention are the subject of additional claims.
Gemäß der Erfindung sind für eine Elektronenröhre, insbesondere eine Sendetetrode, zwei getrennte Schirmgitteranschlußelemente (Kontaktringe) und Durchführungen vorgesehen. Die erste Durchführung besteht dabei aus einem gut wärmeleitenden Werkstoff mit geringen HF-Verlusten. Aufgrund seiner Konstruktion und seiner physikalischen Eigenschaften läßt sich dieser Werkstoff gut kühlen. Von weiterem Vorteil ist, daß dadurch die durch die elektrische Wellenlänge bedingte Systemlänge unabhängig von mechanischen Erfordernissen kurz gehalten werden kann. Die zweite Durchführung wird für den mechanischen Aufbau,Befestigung des Schirmgitters und Verschließen der Vakuumhülle benutzt. Bei der Werkstoffauswahl wird die mechanische Beanspruchung und die thermische Ausdehnung des hieran durch Verschrauben befestigten Schirmgitters berücksichtigt. Ein wesentlicher Vorteil besteht darin, daß durch die doppelte Schirmgitterdurchführung eine Kühlluftführung erreicht wird, mit der sich die zulässigen Temperaturen der Röhre beherrschen lassen.
Darüber hinaus ist von besonderem Vorteil, daß durch die doppelten Schirmgitteranschlüsse außerdem eine vollkommene Trennung der HF-Ströme des Anoden-Schirmgitter(G₂)-Raumes und des Steuergitter(G₁)-Schirmgitter(G₂)-Raumes erreicht wird. Kopplungen, die z.B. an Schirmgitterkontaktfedern entstehen können, sind damit ausgeschlossen.According to the invention, two separate screen grid connection elements (contact rings) and bushings are provided for an electron tube, in particular a transmission tetrode. The first implementation consists of a good thermally conductive material with low RF losses. Due to its construction and its physical properties, this material can be cooled well. Another advantage is that the system length caused by the electrical wavelength can be kept short regardless of mechanical requirements. The second implementation is used for the mechanical construction, fastening the screen grille and closing the vacuum envelope. When selecting the material, the mechanical stress and the thermal expansion of the screen grille attached to it by screwing are taken into account. A major advantage is that the double screen grille leads to cooling air that can be used to control the permissible temperatures of the tube.
In addition, it is particularly advantageous that a complete separation of the RF currents of the anode screen grid (G₂) space and the control grid (G₁) screen grid (G₂) space is achieved by the double shield grid connections. Couplings that can occur, for example, on screen grid contact springs are therefore excluded.
Anhand eines in der Figur der Zeichnung dargestellten bevorzugten Ausführungsbeispiels soll die Erfindung weiter erläutert werden. Teile, die nicht unbedingt zum Verständnis der Erfindung beitragen, sind in der Figur unbezeichnet oder weggelassen.On the basis of a preferred embodiment shown in the figure of the drawing, the invention will be further explained. Parts which do not necessarily contribute to an understanding of the invention are not shown in the figure or are omitted.
Die Figur zeigt schematisch im Ausschnitt als Ausführungsbeispiel eine Sendetetrode. Die Sendetetrode weist im wesentlichen einen koaxialen Aufbau der Elektroden, nämlich der Kathode, des Steuergitters, des Schirmgitters und der Anode sowie deren Durchführungen auf. Der Anschluß des Schirmgitters 5 besteht aus zwei in axialer Richtung voneinander beabstandeten ringförmigen Schirmgitteranschlußelementen (Kontaktringen) 1 und 2. Diese beiden Schirmgit teranschlußelemente 1, 2 bilden zusammen mit ihren zugehörigen Durchführungen 3, 4 eine koaxiale Kühlluftführung (Kühlluftkanal), deren Verlauf durch Pfeile 7 angedeutet ist. Die ringförmigen Schirmgitteranschlußelemente 1, 2 bestehen aus einem Metall oder einer Legierung hoher Wärmeleitfähigkeit, vorzugsweise aus Kupfer. Die erste Durchführung 3 besteht wiederum aus einem gut wärmeleitenden Werkstoff, und zwar aus einem mit geringen HF-Verlusten, vorzugsweise aus Kupfer. Die zweite Durchführung 4 besteht aus einem mechanisch stabilen Werkstoff, dessen thermischer Ausdehnungskoeffizient an den des als Vakuumhülle 6 bevorzugt verwendeten Metall-Keramik-Materials angepaßt ist. Als Werkstoff für die zweite Durchführung 4 ist eine Eisen-Kobalt-Nickel-Legierung besonders geeignet, um eine vakuumdichte Metall-Keramik-Verbindung der Vakuumhülle 6 zu erhalten. Das Keramikmaterial dient dabei als Isolationsstrecke zwischen den einzelnen Metall-Keramik-Verbindungen bzw. Durchführungen der Tetrode. Das Schirmgitter 5 ist an der zweiten Durchführung 4 mittels einer Verschraubung 8 befestigt. Die außen an den Schirmgitteranschlußelementen (Kontaktringen) 1, 2 in Form eines Schirmgitterfederkranzes angebrachten Kontaktfedern 9 erlauben eine nahezu unbeeinträchtigte koaxiale Kühlluftführung in Richtung der Pfeile 7.The figure schematically shows a cutout as an exemplary embodiment of a transmission tetrode. The transmitting tetrode essentially has a coaxial structure of the electrodes, namely the cathode, the control grid, the screen grid and the anode and their bushings. The connection of the screen grid 5 consists of two annular screen grid connection elements (contact rings) 1 and 2 spaced apart from one another in the axial direction. These two screen screens teranschlußelemente 1, 2 form together with their associated bushings 3, 4 a coaxial cooling air duct (cooling air duct), the course of which is indicated by arrows 7. The ring-shaped screen grid connection elements 1, 2 consist of a metal or an alloy of high thermal conductivity, preferably of copper. The first bushing 3 in turn consists of a good heat-conducting material, namely one with low RF losses, preferably copper. The second bushing 4 consists of a mechanically stable material, the coefficient of thermal expansion of which is adapted to that of the metal-ceramic material which is preferably used as the vacuum envelope 6. An iron-cobalt-nickel alloy is particularly suitable as the material for the second bushing 4 in order to obtain a vacuum-tight metal-ceramic connection of the vacuum envelope 6. The ceramic material serves as an insulation gap between the individual metal-ceramic connections or bushings of the tetrode. The screen grid 5 is fastened to the second bushing 4 by means of a screw connection 8. The contact springs 9 attached to the outside of the screen grid connection elements (contact rings) 1, 2 in the form of a screen grid spring ring allow an almost unimpaired coaxial cooling air flow in the direction of the arrows 7.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19863625843 DE3625843A1 (en) | 1986-07-30 | 1986-07-30 | UMBRELLA ELECTRON TUBES, IN PARTICULAR TRANSMITTING TEDRODE, HIGH PERFORMANCE AND HIGH FREQUENCIES |
| DE3625843 | 1986-07-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0257278A1 true EP0257278A1 (en) | 1988-03-02 |
| EP0257278B1 EP0257278B1 (en) | 1990-05-23 |
Family
ID=6306351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87110165A Expired - Lifetime EP0257278B1 (en) | 1986-07-30 | 1987-07-14 | Shield grid electron tube, particularly a high power, high frequency emitting tetrode |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4779022A (en) |
| EP (1) | EP0257278B1 (en) |
| JP (1) | JPS6337538A (en) |
| DE (2) | DE3625843A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0407252A1 (en) * | 1989-07-04 | 1991-01-09 | Thomson Tubes Electroniques | Grid tube with a coupled-cavity output and the coupling element integrated within the tube |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5315611A (en) * | 1986-09-25 | 1994-05-24 | The United States Of America As Represented By The United States Department Of Energy | High average power magnetic modulator for metal vapor lasers |
| EP0496008B1 (en) * | 1991-01-21 | 1995-09-13 | Thomson Elektronenröhren AG | Controllable high-power electron tube |
| US5434770A (en) * | 1992-11-20 | 1995-07-18 | United States Department Of Energy | High voltage power supply with modular series resonant inverters |
| KR0151261B1 (en) * | 1995-07-14 | 1998-12-15 | 문정환 | Pulse width modulation circuit |
| US10491174B1 (en) * | 2017-04-25 | 2019-11-26 | Calabazas Creek Research, Inc. | Multi-beam power grid tube for high power and high frequency operation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE872609C (en) * | 1951-02-06 | 1953-04-02 | Siemens Ag | Air-cooled electron tubes |
| EP0162754A1 (en) * | 1984-05-09 | 1985-11-27 | Thomson-Csf | Electronic tube having a device for cooling the grid base |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE162754C (en) * | ||||
| US3227905A (en) * | 1961-10-02 | 1966-01-04 | Eitel Mccullough Inc | Electron tube comprising beryllium oxide ceramic |
| US3567982A (en) * | 1968-12-23 | 1971-03-02 | Sylvania Electric Prod | Electron discharge device anode fin having heat distortion preventive means incorporated therein |
| US3641380A (en) * | 1970-02-24 | 1972-02-08 | Gen Electric | Anode electrode for electron discharge device |
| US4302701A (en) * | 1978-07-07 | 1981-11-24 | Siemens Aktiengesellschaft | Directly heated cathode for an electron tube with coaxial electrode design |
| US4295077A (en) * | 1980-02-14 | 1981-10-13 | Rca Corporation | Circumferentially apertured cylindrical grid for electron tube |
| FR2564239B1 (en) * | 1984-05-09 | 1986-09-19 | Thomson Csf | ELECTRONIC TUBE PROVIDED WITH A CATHODE COOLING DEVICE |
-
1986
- 1986-07-30 DE DE19863625843 patent/DE3625843A1/en not_active Withdrawn
-
1987
- 1987-06-12 US US07/060,815 patent/US4779022A/en not_active Expired - Fee Related
- 1987-07-14 DE DE8787110165T patent/DE3762935D1/en not_active Expired - Fee Related
- 1987-07-14 EP EP87110165A patent/EP0257278B1/en not_active Expired - Lifetime
- 1987-07-24 JP JP62185351A patent/JPS6337538A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE872609C (en) * | 1951-02-06 | 1953-04-02 | Siemens Ag | Air-cooled electron tubes |
| EP0162754A1 (en) * | 1984-05-09 | 1985-11-27 | Thomson-Csf | Electronic tube having a device for cooling the grid base |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0407252A1 (en) * | 1989-07-04 | 1991-01-09 | Thomson Tubes Electroniques | Grid tube with a coupled-cavity output and the coupling element integrated within the tube |
| FR2649533A1 (en) * | 1989-07-04 | 1991-01-11 | Thomson Tubes Electroniques | GATE TUBE WITH COUPLED CAVITY OUTPUT, WITH INTEGRATED TUBE COUPLING ELEMENT |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3625843A1 (en) | 1988-02-11 |
| EP0257278B1 (en) | 1990-05-23 |
| US4779022A (en) | 1988-10-18 |
| DE3762935D1 (en) | 1990-06-28 |
| JPS6337538A (en) | 1988-02-18 |
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