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High-frequency pentode tube
In the field of electronics, the EF50 is an early all-glass wideband remote cutoff pentode designed in 1938 by Philips. It was a landmark in the development
EF50
Canon DSLR EF mount lens
5-4.5L lens. This lens has very similar physical qualities compared to the EF50-200mm f/3.5-4.5. The main difference is that this is an L lens, meaning that
Canon_EF_50-200mm_lens
First electronic stored-program computer, 1948
had a power consumption of 3500 watts. The arithmetic unit was built using EF50 pentode valves, which had been widely used during wartime. The Baby used
Manchester_Baby
English electronics company
sets at an average price of £34 (equivalent to £1,921 in 2025). The new EF50 valve from Philips enabled Pye to build this high-gain receiver, which was
Pye_(electronics_company)
British industrial manufacturer, 1918–1968
1400 (Portugal) CP Class 1800 (Portugal) JNR ED17 electric locomotive JNR EF50 electric locomotive Keretapi Tanah Melayu Class 15 shunter Keretapi Tanah
English_Electric
Vacuum tube with five electrodes
first used in consumer-type radio receivers. A well-known pentode type, the EF50, was designed before the start of World War II, and was extensively used
Pentode
Blood vessel disorder causing ulcers in the lower limbs
Classification D ICD-11: EF50 ICD-10: L95.0 ICD-9-CM: 709.1 MeSH: D000090122 SNOMED CT: 238775002 External resources eMedicine: article/1082675 GARD: Livedoid
Livedoid_vasculopathy
Plug-in vacuum tube holder
side-contact P8A base). Nine-pin loctal bases, B9G, include the 1938 Philips EF50, EL60 and some type numbers in the European 20–29 and 50–59 range; There
Tube_socket
Family of VHF/UHF vacuum tubes
717A pentodes were referred to as Doorknob tubes. The introduction of the EF50 was the first serious competition for the acorn design, and replaced the
Acorn_tube
1926 Number built 2 2 2 2 17 4 3 3 6 6 2 8 2 12 14 2 Renumbered in 1928 ED10 ED11 ED12 ED13 ED50 ED14 ED15 ED51 ED52 ED53 ED54 EF50 EF51 EC40 ED40 ED41
Japan Railways locomotive numbering and classification
Japan_Railways_locomotive_numbering_and_classification
Measurement of the direction from which a received signal was transmitted
to reduce lead lengths, such as frame grid construction, as used in the EF50, and planar construction, very few tubes could operate above UHF. Intensive
Direction_finding
Species of flowering plant
iNaturalist: 409502 IPNI: 866979-1 IUCN: 161478201 NCBI: 450840 NZOR: 85abe6a6-ef50-455d-98a5-6a41eb3c04a2 Open Tree of Life: 485137 Plant List: tro-50075280
Melicytus_novae-zelandiae
Species of ant
iNaturalist: 460971 Insecta.pro: 121259 IRMNG: 10803285 ITIS: 578307 NCBI: 602163 Open Tree of Life: 3258055 Plazi: D4614E1F-9E5B-5F7A-EF50-0B853F2156DE
Acromyrmex_lobicornis
the British coastal defence radar system, and helped with the supply of EF50 valves for later British radar operating at VHF. Frankland, Mark (2002).
Charles_Orr_Stanley
British author and radio enthusiast
sparingly). A mains two valve design used the war-surplus, metal-can enclosed, EF50 valves. When transistors first became available to amateurs in the mid-1950s
Gilbert_Davey
Early commercial computer
broke down. Additionally, the machine used 4,200 thermionic valves, mostly EF50 pentodes and diodes that had to be replaced constantly. The Williams tubes
Ferranti_Mercury
base EF42 – Pentode, EF52 with a Rimlock base EF43 – Remote-cutoff pentode EF50 (EF53) – Remote-cutoff pentode for use in the IF stages of 1940s TV and radar
List of Mullard–Philips vacuum tubes
List_of_Mullard–Philips_vacuum_tubes
EU38 — March 11, 2007 Kitt Peak Spacewatch · 2.2 km MPC · JPL 611691 2007 EF50 — March 10, 2007 Mount Lemmon Mount Lemmon Survey EMA 2.6 km MPC · JPL 611692
List of minor planets: 611001–612000
List_of_minor_planets:_611001–612000
Type of aircraft radar
receiver was due to the use of a new type of tube developed by Philips, the EF50 "Miniwatt", which had been designed specifically for efficient VHF use. The
ASV_Mark_II_radar
December 9, 2012 Haleakala Pan-STARRS 1 · 2.3 km MPC · JPL 501525 2014 EF50 — September 4, 2011 Haleakala Pan-STARRS 1 · 3.9 km MPC · JPL 501526 2014
List of minor planets: 501001–502000
List_of_minor_planets:_501001–502000
Operational model of the world's first air-to-air radar system
based on an innovative vacuum tube developed by Philips of Holland, the EF50 pentode. Appleton mentioned the Pye design to Bowen, who found it to be a
AI_Mark_IV_radar
2004 EC48 — March 15, 2004 Catalina CSS · 2.0 km MPC · JPL 177499 2004 EF50 — March 12, 2004 Palomar NEAT (5) 1.2 km MPC · JPL 177500 2004 EV52 — March
List of minor planets: 177001–178000
List_of_minor_planets:_177001–178000
EL37 — March 4, 2008 Kitt Peak Spacewatch · 3.4 km MPC · JPL 444971 2008 EF50 — February 28, 2008 Mount Lemmon Mount Lemmon Survey · 1.8 km MPC · JPL
List of minor planets: 444001–445000
List_of_minor_planets:_444001–445000
A similar series was published after 1945 utilising the then ubiquitous EF50 RF pentode amplifier valve (tube). With the outbreak of World War II and
Electronics_World
2011 ES41 — October 24, 2003 Socorro LINEAR · 4.6 km MPC · JPL 411585 2011 EF50 — November 15, 2003 Kitt Peak Spacewatch · 4.0 km MPC · JPL 411586 2011
List of minor planets: 411001–412000
List_of_minor_planets:_411001–412000
Topics referred to by the same term
Z90 may refer to: EF50 vacuum tube (alternate name Z90) IXUS Z90 camera Stampede Airport (airport designation Z90) This disambiguation page lists articles
Z90
2002 ES45 — March 11, 2002 Palomar NEAT AGN 1.9 km MPC · JPL 226010 2002 EF50 — March 12, 2002 Palomar NEAT · 2.7 km MPC · JPL 226011 2002 EX52 — March
List of minor planets: 226001–227000
List_of_minor_planets:_226001–227000
2000 ED48 — March 9, 2000 Socorro LINEAR · 3.3 km MPC · JPL 60531 2000 EF50 — March 9, 2000 Tebbutt F. B. Zoltowski · 5.3 km MPC · JPL 60532 Henson
List of minor planets: 60001–61000
List_of_minor_planets:_60001–61000
Australian astronomer
(59761) 1999 MZ 23 June 1999 list (60531) 2000 EF50 9 March 2000 list (65958) 1998 GG1 4 April 1998 list (66001) 1998 OG1 17 July 1998 list (66279) 1999
Frank_B._Zoltowski
EF50
EF50
EF50
EF50
Girl/Female
Muslim
Good pedigree
Girl/Female
Arabic, Muslim, Sindhi
Big; Elder
Male
English
Anglicized form of Hebrew Achyan, AHIAN means "brotherly" or "fraternal." In the bible, this is the name of a member of the tribe of Manasseh.
Surname or Lastname
English
English : variant spelling of Redfern.
Boy/Male
Spanish
Prosperous guardian.
Male
Irish
Old Irish Gaelic name MAOILMHÃN means "gentle chieftain."
Girl/Female
Spanish
Miracle.
Boy/Male
Arabic, Assamese, Bengali, Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi, Mythological, Oriya, Sanskrit, Tamil, Telugu, Traditional
Lord Shiva; Sun
Girl/Female
Persian
Raindrop.
Girl/Female
Indian
Meditation
EF50
EF50
EF50
EF50
EF50