Tube Identification Help Please

artaudio · 2005-05-01 4:47 am

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

[IMGDEAD]http://www.artaudio.com.au/images/tube1.jpg[/IMGDEAD]

Giaime · 2005-05-01 10:42 am

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

artaudio · 2005-05-01 12:04 pm

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.

[IMGDEAD]http://www.artaudio.com.au/images/tube2.jpg[/IMGDEAD]

SY · 2005-05-01 1:06 pm

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

Giaime · 2005-05-01 1:36 pm

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

Why? To do what?

artaudio · 2005-05-01 1:38 pm

SY said:
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 · 2005-05-01 1:42 pm

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 · 2005-05-01 1:46 pm

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

artaudio · 2005-05-01 2:14 pm

richwalters said:
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.

[IMGDEAD]http://www.artaudio.com.au/images/tube3.jpg[/IMGDEAD]

artaudio · 2005-05-01 2:37 pm

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

cheers

Alan

nonik · 2005-05-01 6:21 pm

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 · 2005-05-02 12:23 am

Andre,

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

cheers

Alan

Tube Identification Help Please

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