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Old 9th February 2009, 01:12 PM   #1
Cassiel is offline Cassiel  Libya
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Default 7 pin ECC81.

Hi,

I have a hundred of these little orphans but i canīt find any info about them. A double triode with a common cathode perhaps?
I'll appreciate if someone has any data.
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Old 9th February 2009, 01:35 PM   #2
kmaier is offline kmaier  United States
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Possibly a 6J6.

Regards, KM
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Old 9th February 2009, 01:45 PM   #3
Hi_Q is offline Hi_Q  England
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Could be a 6J6? Any chance of measuring heater current at 6.3V as the 6J6 has a quoted consumption of 450mA as opposed to the usual 300mA. It may help in your investigations.
Also see if you can identify the connections inside the glass envelope.
For a 6J6, Pin 1 = A', Pin 2 = A'', Pin 3 = heater, Pin 4 = heater, Pin 5 = G'', Pin 6 = G', Pin 7 = Common Cathode.
Les

You just pipped me KM
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Old 9th February 2009, 02:01 PM   #4
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If it LOOKS like a 12AU7 or 12AT7 inside, it might be a 2033. Heater current is 300 mA. Same pinout as 6J6.
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Old 9th February 2009, 02:14 PM   #5
Cassiel is offline Cassiel  Libya
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Many thanks for the help. I will check the internal connections.

I have edited the pic, now you can see better the ecc81 label.
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Old 9th February 2009, 02:36 PM   #6
kmaier is offline kmaier  United States
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I would suspect it's an ECC91 with smudgy print.

http://tdsl.duncanamps.com/show.php?des=ECC91

Regards, KM
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Old 9th February 2009, 02:48 PM   #7
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Default ECC91 6J6

Excellent tube for push pull applications,
the link shows a homemade FM frontend:

http://ukw-projekt.blogspot.com/2008...gegentakt.html

Kind regards,
Darius
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Old 9th February 2009, 08:31 PM   #8
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Quote:
I have a hundred of these little orphans but i canīt find any info about them.
It does look a lot like the 6J6/6101/6099/ECC91. I have at least 1000 of them and I keep finding more. You can wire both sides in parallel and use it as a single triode, or use it as an LTP. Morgan Jones mentions this tube in his Valve Amplifiers book (3rd edition). Use an LM334 for the CCS in the tail. Call it LTP made simple.

Quote:
If it LOOKS like a 12AU7 or 12AT7 inside, it might be a 2033. Heater current is 300 mA. Same pinout as 6J6.
I have some little 7 pin 12AU7 type tubes with the same pinout as the 6J6. They are 5844's.
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Old 10th February 2009, 07:58 AM   #9
Colt45 is offline Colt45  Serbia
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Doesn't look quite like a normal 6J6, but that's probably because it's Russian.

6N15P.
Does this look familiar?
Click the image to open in full size.


6J6 is an alright tube, but she loves to oscillate

here is data:
http://www.klausmobile.narod.ru/td/data/_6n15p.GIF
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Old 16th February 2009, 02:00 PM   #10
Cassiel is offline Cassiel  Libya
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OK, I didn't have time until this weekend but i have checked the tube and, yes : pinout same as 6J6.

And Colt is right; seems the Russian version.

Thank you guys.
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