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Old 27th December 2008, 07:02 PM   #1
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Question Interresting Quiz. Which tube is this?

I have got a pretty large collection with tubes as a christmas present

Several of them has unreadable labels and most of them are common TV tubes which not are that useful anyway.

But I would like some help with one type of tube which I have three of. It's a long size 9pin tube with goldplated pins and top anode which also are goldplated. It seems to be a double penthode tube. I have never come cross anything like this before.

As a challenge for all tubelovers before the new year arrive, I have taken two photos of one of the tubes and put up to see here .

Please, is there anybody recognizing this tube?

Click the image to open in full size.

Click the image to open in full size.
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Old 27th December 2008, 07:16 PM   #2
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Are you sure that's an anode, not a cathode, cap? Is that a "normal" Noval base or is it the heavier duty Magnoval? The Russian 6Д22С (6d22s) is a Magnoval based damper diode, with a cathode cap.
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Old 27th December 2008, 09:22 PM   #3
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Normal 9 pin and definately an anode coupled top hat.
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Old 27th December 2008, 09:57 PM   #4
adalin is online now adalin  Sweden
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EL81 or PL81
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Old 27th December 2008, 11:15 PM   #5
Colt45 is offline Colt45  Serbia
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Yes, looks like PL81 to me
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Old 28th December 2008, 12:41 PM   #6
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Yes, you are probably right

PL81 it seems to be.

Thanks
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