Tube Identification Help Please

[artaudio]

Hello,

For my first post, Would anyone know what the tube on the left of the attached photo is. There are no marking on the tube that I can see.

cheers

Alan

An externally hosted image should be here but it was not working when we last tested it.

 

[Giaime]

I see only 5 pins out of that tube... and also the plates look a bit too near... maybe a double diode.

 

[artaudio]

Thanks,

The tube has 9 pins and was fitted to one of my power amps as an input tube. They sound very good but I'm sure its not a 6072 12ay7 that is part of the amp design.

Hope this extra info helps.

An externally hosted image should be here but it was not working when we last tested it.

 

[SY]

Check the DC resistance between pins 4 and 5, and likewise between 5 and 9.

 

[Giaime]

Check the DC resistance between pins 4 and 5, and likewise between 5 and 9.

Why? To do what?

 

[artaudio]

Check the DC resistance between pins 4 and 5, and likewise between 5 and 9.

Between pins 4 and 5 =13.6, 5 and 9 =7.1

Cheers

Alan

 

[richwalters]

gold pins ? my guess is a double triode somewhere in the E80 or so SQ family..........clue is slotted anode so often in triodes.....need an expanded photo

richj

 

[SY]

OK, the pinout is not exotic. The resistance eliminates 6201 or 12AZ7, so it's most likely something in the 12AT7/ECC81 family.

 

[artaudio]

gold pins ? my guess is a double triode somewhere in the E80 or so SQ family..........clue is slotted anode so often in triodes.....need an expanded photo

richj

Expanded photo. Thanks for the help.

An externally hosted image should be here but it was not working when we last tested it.

 

[artaudio]

I have found some faint printing or etching on the tubes "D8L2" and "D8L4" must be a date code?

cheers

Alan

 

[nonik]

This is your tube.

http://www.tube-classics.de/TC/Tubes/Valvo ECC81/ECC819.htm

got one that has the same production-code Df6, so its made by
Valvo in Hamburg - Germany but has the real-life code 12AT7WA
that was also sold as a E81CC / 6201

Andre

 

[artaudio]

Andre,

Thank you, for your help. That is the tube, now I can start looking for some more to buy.

cheers

Alan