The Telefunken EF86?

H.Michi · 8th July 2011, 02:35 AM

Is anyone knows about background of this tube?
I bought 4 tubes which described as NOS Telefunken EF86, without notation even product name at German Ham fair in Fridrichshafen. They were put in the bulk package box. the price was 8 eur per tube.

astouffer · 8th July 2011, 04:12 AM

Telefunken should have a diamond shape stamped into the glass on the bottom of the tube.

H.Michi · 8th July 2011, 07:06 AM

Thank you for your reply.
I can see a square mark (may be diamond) in a circle on the bottom of the tube.

DavesNotHere · 8th July 2011, 03:52 PM

as I rememberred, ef86 was Telefunken's take on the 7199 tube.

refinements of this tube design was later introduced as ef 806

DavesNotHere · 8th July 2011, 06:40 PM

7199 pentode stage of course, 6sj7. 6j7,

kevinkr · 8th July 2011, 06:52 PM

Actually the EF86 is not anyone's take on the 7199, it is a moderate transconductance low noise pentode designed for low level audio applications with low microphony being a major point of the design. The US equivalent is the 6267 IIRC.

Those tubes don't look anything like any EF86 I have seen, doesn't mean they aren't but can you get get better pictures of the plate structure? Not sure if it is a single which is what it appears to be - the pictures make it hard to tell.

Telefunken made good 6U8A and 6BL8 and I am wondering if these could be one of those? (Probably wrong)

If they are indeed what they are represented to be they should be very good.

kstagger · 8th July 2011, 10:16 PM

I used to be a bit of an EF86 'collector' and those certainly don't look like any Tele EF86 I've ever seen. The Telefunken EF86s I owned had nickel plates. The ones pictured almost look like Teslas... ???

astouffer · 8th July 2011, 11:48 PM

The few EF86s in my collection look like the ones posted except lighter grey colored plates and orange Amperex logos. For some reason all the Amperex pics I can find are the mesh plate type.

vinylkid58 · 9th July 2011, 12:00 AM

Quote:

Originally Posted by kstagger

I used to be a bit of an EF86 'collector' and those certainly don't look like any Tele EF86 I've ever seen. The Telefunken EF86s I owned had nickel plates.

Appears they came with a grey OR silver shield. Take a look on the tubeworld page:

https://www.tubeworld.com/6267.htm

jeff

MrCurwen · 9th July 2011, 03:52 AM

Maybe OP has some Russian equivalents on his hands?

8th July 2011, 06:52 PM	#6
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Actually the EF86 is not anyone's take on the 7199, it is a moderate transconductance low noise pentode designed for low level audio applications with low microphony being a major point of the design. The US equivalent is the 6267 IIRC. Those tubes don't look anything like any EF86 I have seen, doesn't mean they aren't but can you get get better pictures of the plate structure? Not sure if it is a single which is what it appears to be - the pictures make it hard to tell. Telefunken made good 6U8A and 6BL8 and I am wondering if these could be one of those? (Probably wrong) If they are indeed what they are represented to be they should be very good. __________________ www.kta-hifi.net

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8th July 2011, 04:12 AM	#2
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	Telefunken should have a diamond shape stamped into the glass on the bottom of the tube.

8th July 2011, 07:06 AM	#3
H.Michi diyAudio Member Join Date: Jan 2009	Thank you for your reply. I can see a square mark (may be diamond) in a circle on the bottom of the tube.

8th July 2011, 03:52 PM	#4
DavesNotHere diyAudio Member Join Date: Jun 2011	as I rememberred, ef86 was Telefunken's take on the 7199 tube. refinements of this tube design was later introduced as ef 806

8th July 2011, 06:40 PM	#5
DavesNotHere diyAudio Member Join Date: Jun 2011	7199 pentode stage of course, 6sj7. 6j7,

8th July 2011, 10:16 PM	#7
kstagger diyAudio Member Join Date: Dec 2003 Location: Grand Rapids	I used to be a bit of an EF86 'collector' and those certainly don't look like any Tele EF86 I've ever seen. The Telefunken EF86s I owned had nickel plates. The ones pictured almost look like Teslas... ???

8th July 2011, 11:48 PM	#8
astouffer diyAudio Member Join Date: Jun 2004 Location: Pittsburgh, crumbling wasteland	The few EF86s in my collection look like the ones posted except lighter grey colored plates and orange Amperex logos. For some reason all the Amperex pics I can find are the mesh plate type.

9th July 2011, 03:52 AM	#10
MrCurwen diyAudio Member Join Date: Feb 2010	Maybe OP has some Russian equivalents on his hands?

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