ECC82

BJK · 23rd April 2006, 01:59 PM

I have a few tubes that are marked ECC82 Made in western
Germany. That was all I could read off them. They have plain gray plates with top getters.
Would anyone have some insight as to what plant made them, ect.
Thanks

edl · 23rd April 2006, 02:37 PM

Hi BJK,

That's an indirectly heated double triode for audio purpouses.
A plenty of commercially made and DIY-project amplifer using them as driver, or sometimes as preamp tube.
Many tubefactory manufactured and manufacturing this tube.
In the USA it's called 12AU7.
Datasheet can be found here: http://frank.pocnet.net

All the best,

Tom Bavis · 23rd April 2006, 02:43 PM

Diamond in glass between pins (often faint) - Telefunken.

Etched code on side near base? Valvo (Philips)

Could be Eastern European, despite marking.

EC8010 · 23rd April 2006, 10:16 PM

Mullard's ECC82 data sheet says that it's designed for television field scan, Tung-Sol's 12AU7 data sheet says it's designed for audio.

anatech · 23rd April 2006, 10:49 PM

Hi EC8010,
Soooo, does that mean you should buy the ones made in North America?

-Chris

EC8010 · 23rd April 2006, 11:00 PM

Hello Anatech. Well, I suppose it depends on whether you think that 12AU7 is really identical to ECC82 or merely equivalent (drop-in usable). Perhaps 12AU7 is OK for audio - we don't see a lot of American toobs in Europe unless we specifically order them (and pay Customs charges on top of shipping), so I can't comment. It's as well to remember that it only takes a tiny difference on the curves to make a big difference to distortion, so two valves could be equivalent as far as gross characteristics are concerned yet wildly different when second-order characteristics like distortion are investigated.

anatech · 24th April 2006, 02:51 AM

Hi EC8010,
Well, I was pulling your leg. But you do bring up an excellent point where tube "equivalents" are concerned. I imagine a similar difference exists between manufacturers. Then it becomes whatever the designer used as a "bogey" tube model as to what tube is the best for a particular circuit.

Personal preferences will muddy that water up forever.

-Chris

23rd April 2006, 01:59 PM	#1
BJK diyAudio Member Join Date: Apr 2006 Location: New York	Ecc82 I have a few tubes that are marked ECC82 Made in western Germany. That was all I could read off them. They have plain gray plates with top getters. Would anyone have some insight as to what plant made them, ect. Thanks

23rd April 2006, 10:16 PM	#4
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	Mullard's ECC82 data sheet says that it's designed for television field scan, Tung-Sol's 12AU7 data sheet says it's designed for audio. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

23rd April 2006, 11:00 PM	#6
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	Hello Anatech. Well, I suppose it depends on whether you think that 12AU7 is really identical to ECC82 or merely equivalent (drop-in usable). Perhaps 12AU7 is OK for audio - we don't see a lot of American toobs in Europe unless we specifically order them (and pay Customs charges on top of shipping), so I can't comment. It's as well to remember that it only takes a tiny difference on the curves to make a big difference to distortion, so two valves could be equivalent as far as gross characteristics are concerned yet wildly different when second-order characteristics like distortion are investigated. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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23rd April 2006, 02:37 PM	#2
edl diyAudio Member Join Date: Oct 2004	Hi BJK, That's an indirectly heated double triode for audio purpouses. A plenty of commercially made and DIY-project amplifer using them as driver, or sometimes as preamp tube. Many tubefactory manufactured and manufacturing this tube. In the USA it's called 12AU7. Datasheet can be found here: http://frank.pocnet.net All the best,

23rd April 2006, 02:43 PM	#3
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Diamond in glass between pins (often faint) - Telefunken. Etched code on side near base? Valvo (Philips) Could be Eastern European, despite marking.

23rd April 2006, 10:49 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi EC8010, Soooo, does that mean you should buy the ones made in North America? -Chris

24th April 2006, 02:51 AM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi EC8010, Well, I was pulling your leg. But you do bring up an excellent point where tube "equivalents" are concerned. I imagine a similar difference exists between manufacturers. Then it becomes whatever the designer used as a "bogey" tube model as to what tube is the best for a particular circuit. Personal preferences will muddy that water up forever. -Chris

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