7 pin ECC81.

Cassiel · 9th February 2009, 01:12 PM

Hi,

I have a hundred of these little orphans but i can´t find any info about them. A double triode with a common cathode perhaps?
I'll appreciate if someone has any data.

kmaier · 9th February 2009, 01:35 PM

Possibly a 6J6.

Regards, KM

Hi-Q · 9th February 2009, 01:45 PM

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

Tom Bavis · 9th February 2009, 02:01 PM

If it LOOKS like a 12AU7 or 12AT7 inside, it might be a 2033. Heater current is 300 mA. Same pinout as 6J6.

Cassiel · 9th February 2009, 02:14 PM

Many thanks for the help. I will check the internal connections.

I have edited the pic, now you can see better the ecc81 label.

kmaier · 9th February 2009, 02:36 PM

I would suspect it's an ECC91 with smudgy print.

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

Regards, KM

oldeurope · 9th February 2009, 02:48 PM

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

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

Kind regards,
Darius

tubelab.com · 9th February 2009, 08:31 PM

Quote:

I have a hundred of these little orphans but i can´t 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.

Colt45 · 10th February 2009, 07:58 AM

Doesn't look quite like a normal 6J6, but that's probably because it's Russian.

6N15P.
Does this look familiar?

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

here is data:
http://www.klausmobile.narod.ru/td/data/_6n15p.GIF

Cassiel · 16th February 2009, 02:00 PM

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.

9th February 2009, 01:35 PM	#2
kmaier diyAudio Member Join Date: Jul 2007	Possibly a 6J6. Regards, KM __________________ ... just because you're paranoid, it doesn't mean they're not after you...

9th February 2009, 02:36 PM	#6
kmaier diyAudio Member Join Date: Jul 2007	I would suspect it's an ECC91 with smudgy print. http://tdsl.duncanamps.com/show.php?des=ECC91 Regards, KM __________________ ... just because you're paranoid, it doesn't mean they're not after you...

9th February 2009, 02:48 PM	#7
oldeurope diyAudio Member Join Date: Mar 2008	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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9th February 2009, 01:45 PM	#3
Hi-Q diyAudio Member Join Date: Oct 2007	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

9th February 2009, 02:01 PM	#4
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	If it LOOKS like a 12AU7 or 12AT7 inside, it might be a 2033. Heater current is 300 mA. Same pinout as 6J6.

10th February 2009, 07:58 AM	#9
Colt45 diyAudio Member Join Date: Feb 2002 Location: Canada	Doesn't look quite like a normal 6J6, but that's probably because it's Russian. 6N15P. Does this look familiar? 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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