12au7 tube question?

The European equiv.s are ECC82, ECC802s, CV4003. Go to Joe's Tube Lore at AudioAsylum for a detailed evaluation of 12AU7s. In my system, I liked Amperex Holland Heerlen labelled Dumonts best.

Red:
Swampwalker's advice to review the info on AA at Joe's Tube Lore is good. I have found his information to be helpful to me. I am following his advice and am awaiting delivery of Amperex Holland Bugle Boys which he favors.
Specific to your search for info on 12AU7's, while you are on AA, search for postings on 12AU7's by Robert H. Several on AA seem to hold him in high regard as the resident 12AU7 guru.

What are you currently using for 12AU7's? My favorites in descending order are:
1) Telefunken
2) Amperex Bugle Boys
3) Mullard (please note that the CV4003's in the white boxes and sometimes called 'mil-spec' ARE NOT NOS, but modern crap manufactured in the '80's, and usually sold for obscene profits. No Mullard label on these dogs!)
4) RCA 6189's

The Telefunkens have it all...deep clean bass..airy and extended highs, and an incredible presentation of soundstage. Be careful, as there are many fakes out there. Be prepared to spend $200- and up, for a genuine NOS matched pair from a reliable source, if and when you are able to find them!