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EF8

Information - Help 
ID = 1865
       
Country:
Netherlands
Brand:
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  HEXODE   RF/IF-Stage   Controlling (mu) 
Identical to EF8 = CV1123 = VR123 = CV1713 = VT164_GPO
Similar Tubes
Other class quality (otherwise equal):
  4693
Other base:
  EF22_9pin ; EF38 ; EF8G
Other base and other heater:
  UF8
Multiple differences or of other kind:
  EF13
First year Apr.1938 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
May.1938 : Philips Bulletin
Mar.1938 : Daten und Schaltungen moderner ... Röhren; Philips
Successor Tubes EF22_9pin  

Base Europe side contact base P (P8A) (Codex=Sa) Top contact with a cap
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC
Description

Low noise HF preamp tube.

Descibed in Mullard literature of 1938 as an RF pentode. The additional grid introduces a beam formation into the electron stream so that the electrons can pass between the wires of the screen grid without striking them. This reduces the screen current and imprves the S/N ratio.

 
Text in other languages (may differ)
Tube prices 3 Tube prices (visible for members only)
Literature Babani, International Radio Tube Encyclopaedia   Pages 104 &105
Taschenbuch zum Röhren-Codex 1948/49   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
  umgebungsschaldbild_ef8_a.png
  EF8: Röhrenkartei Drenkelfort
Peter Hoddow
 
ef8_649.jpg
EF8: Collection JR
Jacob Roschy

 
au30.png
EF8: RTT 1974 (Franzis) 13. Auflage
Martin Renz

 
ef8_spec01.png
EF8: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector


Usage in Models 1= 1938?? ; 10= 1938? ; 87= 1938 ; 3= 1939?? ; 6= 1939? ; 72= 1939 ; 7= 1940?? ; 1= 1940? ; 60= 1940 ; 11= 1941? ; 58= 1941 ; 19= 1942 ; 11= 1943 ; 2= 1944 ; 1= 1947? ; 1= 1948?? ; 1= 1950

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):351



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