Interresting Quiz. Which tube is this?

Radioman62 · 27th December 2008, 08:02 PM

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?

Eli Duttman · 27th December 2008, 08:16 PM

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.

Radioman62 · 27th December 2008, 10:22 PM

Normal 9 pin and definately an anode coupled top hat.

adalin · 27th December 2008, 10:57 PM

EL81 or PL81

Colt45 · 28th December 2008, 12:15 AM

Yes, looks like PL81 to me

Radioman62 · 28th December 2008, 01:41 PM

Yes, you are probably right

PL81 it seems to be.

Thanks

27th December 2008, 08:02 PM	#1
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	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? __________________ Cheers// Ove

27th December 2008, 08:16 PM	#2
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	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. __________________ Eli D.

27th December 2008, 10:22 PM	#3
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	Normal 9 pin and definately an anode coupled top hat. __________________ Cheers// Ove

27th December 2008, 10:57 PM	#4
adalin diyAudio Member Join Date: Jun 2004 Location: Gotenburg	EL81 or PL81 __________________ Tubes 4 ever

28th December 2008, 01:41 PM	#6
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	Yes, you are probably right PL81 it seems to be. Thanks __________________ Cheers// Ove

28th December 2008, 12:15 AM	#5
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	Yes, looks like PL81 to me

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