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Old 19th July 2012, 01:04 AM   #1
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Default Mystery tubes on FB?

OK, I've seen a lot of tubes but not miniatures with plate caps -- a friend posted this pic on FB -- can anyone identify:
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Old 19th July 2012, 01:53 AM   #2
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the miniature with top cap is a EL81 horizontal sweep tube for portable B&W TVs
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Old 19th July 2012, 08:49 AM   #3
Colt45 is offline Colt45  Serbia
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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
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Old 19th July 2012, 09:14 AM   #4
7N7 is offline 7N7  United Kingdom
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European TV "Efficiency" (Damper) diodes such as EY82/PY82 are another possibility. With EY82 the top cap is the anode.

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Old 19th July 2012, 09:39 AM   #5
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The internal construction of this tube shouts PL81/EL81.
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Old 19th July 2012, 09:50 AM   #6
disco is offline disco  Netherlands
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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.
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Old 19th July 2012, 10:10 AM   #7
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Quote:
Originally Posted by disco View Post
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"
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Old 19th July 2012, 10:19 AM   #8
disco is offline disco  Netherlands
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The Philips AG9006 was an early OTL, used on 1200 ohm loudspeakers. Very rare these days and rather unaffordable then
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Old 19th July 2012, 10:48 AM   #9
DF96 is offline DF96  England
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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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Old 19th July 2012, 12:42 PM   #10
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I have an EL804. It is a 6CW5/EL86 with a plate cap. It also says Made in USA.
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