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Old 16th November 2010, 05:51 PM   #1
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Default What tube is this?

I cant seem to figure out what tube this is.
It has the philips etching code, but the top row (wich indicates tube type) is unreadable.

It looks like an EF80 but the inner cunstruction is twice the size.
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Old 16th November 2010, 06:24 PM   #2
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What is the pinout of the tube? That would make it easier to identify the mystery tube.
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Old 16th November 2010, 06:37 PM   #3
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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..

Thanks anyway
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Old 17th November 2010, 06:26 PM   #4
Arnulf is offline Arnulf  Europe
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It looks like one of the ECH types, my first guess would be the ubiquitous ECH81.
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Old 17th November 2010, 06:40 PM   #5
DF96 is online now DF96  England
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Might also be EBF89, or EBF80. The silvering suggests not Philips own manufacture, but a lookalike from someone like Ei or BEL.
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Old 17th November 2010, 06:46 PM   #6
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i have a valvo EBF89 but seems not that. it has no silvering btw.
what exactly is it? i never found something online. is it sputtered off grids or off the gauze shield?
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Old 17th November 2010, 07:08 PM   #7
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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

--------------------------------------------------------------------------------

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
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Old 17th November 2010, 08:56 PM   #8
DF96 is online now DF96  England
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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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Old 18th November 2010, 07:43 AM   #9
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The EBF types have 2 holes in the screen while this tube, as the other ECH types i have, have 4 holes.
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Old 18th November 2010, 10:58 AM   #10
DF96 is online now DF96  England
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Look through the holes and see if the top structure is a triode or one or two diodes. If its a triode then you have ECH81, ECH83 or ECH84. The '81 is by far the most common.
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