Mystery tubes on FB?

jackinnj · 19th July 2012, 01:04 AM

OK, I've seen a lot of tubes but not miniatures with plate caps -- a friend posted this pic on FB -- can anyone identify:

radiotron · 19th July 2012, 01:53 AM

the miniature with top cap is a EL81 horizontal sweep tube for portable B&W TVs

Colt45 · 19th July 2012, 08:49 AM

Yeah, presumably some sort of small sweep or so.

There was quite a few dampers in this format too, 6AF3 being one that comes to mind.
Although, technically... these have cathode caps, not plate

7N7 · 19th July 2012, 09:14 AM

European TV "Efficiency" (Damper) diodes such as EY82/PY82 are another possibility. With EY82 the top cap is the anode.

7N7

hidnplayr · 19th July 2012, 09:39 AM

The internal construction of this tube shouts PL81/EL81.

disco · 19th July 2012, 09:50 AM

From 1955 until 1965 EL81 was used in PA and early hifi amplifiers (from Philips Germany if I'm right). A push pull pair produces 20W of audio power.

hidnplayr · 19th July 2012, 10:10 AM

Quote:

Originally Posted by disco

From 1955 until 1965 EL81 was used in PA and early hifi amplifiers (from Philips Germany if I'm right). A push pull pair produces 20W of audio power.

20W yes, in class B, I believe most of us here do not call that "HiFi"

disco · 19th July 2012, 10:19 AM

The Philips AG9006 was an early OTL, used on 1200 ohm loudspeakers. Very rare these days and rather unaffordable then

DF96 · 19th July 2012, 10:48 AM

Yes, looks like a PL81 (or maybe EL81). PL81 and PY81 were very common in European black&white TV sets. PY82 is a supply rectifier, with no top cap.

Probably rare in the US is the Brimar 6BS7, a miniature low noise pentode with a top cap for the grid. Probably a variant of the 6BR7.

tubelab.com · 19th July 2012, 12:42 PM

I have an EL804. It is a 6CW5/EL86 with a plate cap. It also says Made in USA.

19th July 2012, 09:14 AM	#4
7N7 diyAudio Member Join Date: Jan 2003 Location: England	European TV "Efficiency" (Damper) diodes such as EY82/PY82 are another possibility. With EY82 the top cap is the anode. 7N7 __________________ Plug them in and light them up

19th July 2012, 09:39 AM	#5
hidnplayr diyAudio Member Join Date: Sep 2008	The internal construction of this tube shouts PL81/EL81. __________________ Real tubes have top-caps

19th July 2012, 09:50 AM	#6
disco diyAudio Member Join Date: Apr 2006 Location: Holland	From 1955 until 1965 EL81 was used in PA and early hifi amplifiers (from Philips Germany if I'm right). A push pull pair produces 20W of audio power. __________________ jaap

19th July 2012, 10:19 AM	#8
disco diyAudio Member Join Date: Apr 2006 Location: Holland	The Philips AG9006 was an early OTL, used on 1200 ohm loudspeakers. Very rare these days and rather unaffordable then __________________ jaap

19th July 2012, 12:42 PM	#10
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	I have an EL804. It is a 6CW5/EL86 with a plate cap. It also says Made in USA. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.


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19th July 2012, 01:53 AM	#2
radiotron diyAudio Member Join Date: May 2007	the miniature with top cap is a EL81 horizontal sweep tube for portable B&W TVs

19th July 2012, 10:48 AM	#9
DF96 diyAudio Member Join Date: May 2007	Yes, looks like a PL81 (or maybe EL81). PL81 and PY81 were very common in European black&white TV sets. PY82 is a supply rectifier, with no top cap. Probably rare in the US is the Brimar 6BS7, a miniature low noise pentode with a top cap for the grid. Probably a variant of the 6BR7.

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