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Old 23rd April 2006, 01:59 PM   #1
BJK is offline BJK  United States
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Default 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
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Old 23rd April 2006, 02:37 PM   #2
edl is offline edl  Hungary
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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,
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Old 23rd April 2006, 02:43 PM   #3
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Diamond in glass between pins (often faint) - Telefunken.

Etched code on side near base? Valvo (Philips)

Could be Eastern European, despite marking.
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Old 23rd April 2006, 10:16 PM   #4
EC8010 is offline EC8010  United Kingdom
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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.
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Old 23rd April 2006, 10:49 PM   #5
anatech is offline anatech  Canada
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Hi EC8010,
Soooo, does that mean you should buy the ones made in North America?

-Chris
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Old 23rd April 2006, 11:00 PM   #6
EC8010 is offline EC8010  United Kingdom
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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.
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Old 24th April 2006, 02:51 AM   #7
anatech is offline anatech  Canada
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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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