Tube Valve Mazda EF9

Country:Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt
Tube type: Vacuum Pentode RF/IF-Stage Controlling (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 year Apr.1938 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Mar.1938 : L'Histoire Singulière du Tube Radio; G. Duperray 2009
Predecessor Tubes EF5
Successor Tubes 1941 EF22 EF41 UF9 UF5 EF21_9pin EF39
Base Europe side contact P8A (Au P, 8SC) (Codex=Sf) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.2 Ampere / Indirect / Specified voltage AND current AC/DC
Description
Red series

Tube testé au lampemètre de service Centrad modèle 751

(info internet)