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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
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Perfect EF9 PHILIPS MINIWATT Valve Pentode for RF/IF stage to A.M. Military Standard. for radio or other use.
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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
