This tube was sold to me as an ECC83. It's stamped 12AU7A/ECC83! Notice the box, it has a 12AU7A/ECC82 stamp on it, with an ECC83 sticker over it. I bought it anyway, assuming the relabeling was done after measuring the tube and concluding that this 12AU7A had specs closer to a 12AX7. Well, that wasn't true, it's just an ECC82 (looks like an ECC82 too). The sound is very direct, almost solid state. Maybe I'll have it checked out by a harp player with a tube amp I know.
Information from http://www.fbk.eur.nl/BIT/MHM/gear/preamptubes.html
