EF80 Country: Europe
Brand: Common type Europe tube
Tube type: Vacuum Pentode
RF/IF-Stage
Tube ID = 709
Identical to EF80 = 6BX6 = Z719 = Z152 = 8D6 = 64SPT = 6P6_Magnadyne
Similar Tubes Normally replaceable-slightly different: 6EL7
Heater different: 12BX6; UF80; XF80
First year 1951 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s) Jul.1950 : Radio-Mentor # 7
Predecessor Tubes EF42 EF50 EF14
Successor Tubes 1960 EF184
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Base Noval, B9A
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If: 0.3 Ampere / -: Indirect / -: Parallel / series AC/DC /
Dimensions (WHD)
incl. pins / tip 22 x 68 x mm / 0.87 x 2.68 x inch
Weight 20 g / 0.71 oz
Brand: Common type Europe tube
Tube type: Vacuum Pentode
RF/IF-Stage
Tube ID = 709
Identical to EF80 = 6BX6 = Z719 = Z152 = 8D6 = 64SPT = 6P6_Magnadyne
Similar Tubes Normally replaceable-slightly different: 6EL7
Heater different: 12BX6; UF80; XF80
First year 1951 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s) Jul.1950 : Radio-Mentor # 7
Predecessor Tubes EF42 EF50 EF14
Successor Tubes 1960 EF184
--------------------------------------------------------------------------------
Base Noval, B9A
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If: 0.3 Ampere / -: Indirect / -: Parallel / series AC/DC /
Dimensions (WHD)
incl. pins / tip 22 x 68 x mm / 0.87 x 2.68 x inch
Weight 20 g / 0.71 oz
Some German EBF89 look quite different, as they have a solid grey screen. I think of them as a Siemens type, but I may be wrong. The one you have looks like a modified Philips type. I am not sure where the silvering comes from, maybe cathode activation? I don't think it is gettering, as that is at the top as usual.
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