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-   -   Mystery tubes on FB? (http://www.diyaudio.com/forums/tubes-valves/216450-mystery-tubes-fb.html)

jackinnj 19th July 2012 02:04 AM

Mystery tubes on FB?
 
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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 02:53 AM

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

Colt45 19th July 2012 09:49 AM

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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 :p

7N7 19th July 2012 10:14 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 10:39 AM

The internal construction of this tube shouts PL81/EL81.

disco 19th July 2012 10:50 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 11:10 AM

Quote:

Originally Posted by disco (Post 3097456)
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 11:19 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 11:48 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 01:42 PM

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


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