5712 tube data needed

Sorr · 25th March 2010, 07:02 AM

I have a tube marked
3223
5712.

I have looked and looked but cant find any information about it.

Can anybody help?

Tom Bavis · 25th March 2010, 12:27 PM

That may be a date code 322: Tung_Sol, 5712: 1957, week 12. Got a picture?

Sorr · 25th March 2010, 11:41 PM

It seems the anode of one section comes out on pin 9
Heaters are 4/5 and pin 8

Tom Bavis · 26th March 2010, 12:26 AM

Sounds like 5687 - Tung-Sol made plenty of those... heater draw of .45A at 12V would another bit of evidence that it's a 5687.

Sorr · 26th March 2010, 01:53 AM

Yes, I think you are correct, I have found a 5687 and they look identical.
Thanks for your help.

j45yip · 2nd February 2011, 01:31 AM

Hi, I have a similar tube labelled 3223 5708. Could it also be a 5687?

tubelab.com · 2nd February 2011, 02:33 AM

I have a bunch of these too. The 3223 is the common number the 5718 is different on each tube so I believe it is a date code. They were mixed in with a bunch of 5687's and seem to work in the same circuits. All are military pull outs and all were simply dumped together in a large box (about 40 pounds). Most of the thousands of tubes that I got in that lot were from the 1950's.

Sorr · 3rd February 2011, 05:54 AM

Looks the same as mine.
5687

j45yip · 3rd February 2011, 11:33 PM

Thanks for the help, guys. Appreciate it.

wa2ise · 4th February 2011, 01:37 AM

Datasheet here if you need it: http://www.mif.pg.gda.pl/homepages/f...8/5/5687WA.pdf
It's a low mu twin triode, mu = 17, transconductance = 11k

A little bit like a 12AU7 though more transconductance. If it wasn't for the funny pinout, you could try them where 12AU7s are used. You could build a pinout converter adapter if you can find a male 9 pin plug. If you have tons of them, you could build circuits that need lots of low mu twin triodes.

25th March 2010, 07:02 AM	#1
Sorr diyAudio Member Join Date: Aug 2005	5712 tube data needed I have a tube marked 3223 5712. I have looked and looked but cant find any information about it. Can anybody help?

2nd February 2011, 02:33 AM	#7
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	I have a bunch of these too. The 3223 is the common number the 5718 is different on each tube so I believe it is a date code. They were mixed in with a bunch of 5687's and seem to work in the same circuits. All are military pull outs and all were simply dumped together in a large box (about 40 pounds). Most of the thousands of tubes that I got in that lot were from the 1950's. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

4th February 2011, 01:37 AM	#10
wa2ise diyAudio Member Join Date: Apr 2005 Location: NJ	Datasheet here if you need it: http://www.mif.pg.gda.pl/homepages/f...8/5/5687WA.pdf It's a low mu twin triode, mu = 17, transconductance = 11k A little bit like a 12AU7 though more transconductance. If it wasn't for the funny pinout, you could try them where 12AU7s are used. You could build a pinout converter adapter if you can find a male 9 pin plug. If you have tons of them, you could build circuits that need lots of low mu twin triodes. __________________

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25th March 2010, 12:27 PM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	That may be a date code 322: Tung_Sol, 5712: 1957, week 12. Got a picture?

26th March 2010, 12:26 AM	#4
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Sounds like 5687 - Tung-Sol made plenty of those... heater draw of .45A at 12V would another bit of evidence that it's a 5687.

26th March 2010, 01:53 AM	#5
Sorr diyAudio Member Join Date: Aug 2005	Yes, I think you are correct, I have found a 5687 and they look identical. Thanks for your help.

3rd February 2011, 05:54 AM	#8
Sorr diyAudio Member Join Date: Aug 2005	Looks the same as mine. 5687

3rd February 2011, 11:33 PM	#9
j45yip diyAudio Member Join Date: Sep 2004 Location: Singapore	Thanks for the help, guys. Appreciate it.

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