EF 9 Valve

Country: Netherlands Manufacturer: Philips; Eindhoven (tubes international!); Miniwatt Designer: Philips; Eindhoven (tubes international!); Miniwatt Type: Vacuum pentode RF/IF-Stage Control (mu) Identical to EF9 = CV1427 = TEF9 = CV1714 = MEF9 Similar tubes Other class quality (otherwise equal): 4659 Other characteristic (electr. data): EF9N ; WE16 Heater different: UF5 Other base: EF22; EF39 ; EF9G ; W147 Multiple differences or of other kind: EF9nT First series Apr.1938 Tube leaflet collection E.Erb Analysis by original leaflets First information Mar.1938: L'Histoire Singulière du Tube Radio; G. Duperray 2009 Replaces the EF5 Evoluzioni 1941 EF22 EF41 UF9 UF5 EF21_9pin EF39 models