Tube Identification Help Please

artaudio · 1st May 2005, 03:47 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

Giaime · 1st May 2005, 09:42 AM

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

artaudio · 1st May 2005, 11:04 AM

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.

SY · 1st May 2005, 12:06 PM

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

Giaime · 1st May 2005, 12:36 PM

Quote:

Originally posted by SY
Check the DC resistance between pins 4 and 5, and likewise between 5 and 9.

Why? To do what?

artaudio · 1st May 2005, 12:38 PM

Quote:

Originally posted by SY
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 · 1st May 2005, 12:42 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 · 1st May 2005, 12:46 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 · 1st May 2005, 01:14 PM

Quote:

Originally posted by 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

Expanded photo. Thanks for the help.

artaudio · 1st May 2005, 01:37 PM

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

cheers

Alan

1st May 2005, 03:47 AM	#1
artaudio diyAudio Member Join Date: Jan 2005 Location: Sydney	Tube Identification Help Please 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

1st May 2005, 12:06 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Check the DC resistance between pins 4 and 5, and likewise between 5 and 9. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

1st May 2005, 12:46 PM	#8
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	OK, the pinout is not exotic. The resistance eliminates 6201 or 12AZ7, so it's most likely something in the 12AT7/ECC81 family. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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1st May 2005, 09:42 AM	#2
Giaime diyAudio Member Join Date: Oct 2004	I see only 5 pins out of that tube... and also the plates look a bit too near... maybe a double diode.

1st May 2005, 11:04 AM	#3
artaudio diyAudio Member Join Date: Jan 2005 Location: Sydney	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.

1st May 2005, 12:42 PM	#7
richwalters diyAudio Member Join Date: Sep 2003 Location: Alps:Tube amp designs over 150W, SMPS guru.	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

1st May 2005, 01:37 PM	#10
artaudio diyAudio Member Join Date: Jan 2005 Location: Sydney	I have found some faint printing or etching on the tubes "D8L2" and "D8L4" must be a date code? cheers Alan

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