WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
Nevermind, after going through a lot of bags of tubes, I noticed the similarity to the ECH84/ECH83 type. I labelled it ECH84 and put it away. I was hoping for it to be an EF type wich i didnt know yet..
Base Noval, B9A
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If: 0.3 Ampere / -: Indirect / -: Parallel / series AC/DC /
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.