What tube is this?

hidnplayr · 16th November 2010, 05:51 PM

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.

Frank Berry · 16th November 2010, 06:24 PM

What is the pinout of the tube? That would make it easier to identify the mystery tube.

hidnplayr · 16th November 2010, 06:37 PM

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

Arnulf · 17th November 2010, 06:26 PM

It looks like one of the ECH types, my first guess would be the ubiquitous ECH81.

DF96 · 17th November 2010, 06:40 PM

Might also be EBF89, or EBF80. The silvering suggests not Philips own manufacture, but a lookalike from someone like Ei or BEL.

jechentau · 17th November 2010, 06:46 PM

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?

h00hbt · 17th November 2010, 07:08 PM

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

DF96 · 17th November 2010, 08:56 PM

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.

hidnplayr · 18th November 2010, 07:43 AM

The EBF types have 2 holes in the screen while this tube, as the other ECH types i have, have 4 holes.

DF96 · 18th November 2010, 10:58 AM

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.

16th November 2010, 06:24 PM	#2
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	What is the pinout of the tube? That would make it easier to identify the mystery tube. __________________ Frank

16th November 2010, 06:37 PM	#3
hidnplayr diyAudio Member Join Date: Sep 2008	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 __________________ Real tubes have top-caps

17th November 2010, 06:26 PM	#4
Arnulf diyAudio Member Join Date: Feb 2009	It looks like one of the ECH types, my first guess would be the ubiquitous ECH81. __________________ mod verb, transitive /mod/ to state that one is utterly clueless about the operation of device to be "modded" and into "fixing" things that are not broken; "My new amplifier sounds great so I want to mod it."

17th November 2010, 07:08 PM	#7
h00hbt diyAudio Member Join Date: Jun 2007	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 __________________ /H

18th November 2010, 07:43 AM	#9
hidnplayr diyAudio Member Join Date: Sep 2008	The EBF types have 2 holes in the screen while this tube, as the other ECH types i have, have 4 holes. __________________ Real tubes have top-caps

17th November 2010, 06:40 PM	#5
DF96 diyAudio Member Join Date: May 2007	Might also be EBF89, or EBF80. The silvering suggests not Philips own manufacture, but a lookalike from someone like Ei or BEL.

17th November 2010, 06:46 PM	#6
jechentau diyAudio Member Join Date: Feb 2005 Location: Gelderland	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?

17th November 2010, 08:56 PM	#8
DF96 diyAudio Member Join Date: May 2007	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.

18th November 2010, 10:58 AM	#10
DF96 diyAudio Member Join Date: May 2007	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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