Got my Telefunken 12AX7/ECC83 with ribbed plates in the mail this morning.
Expensive but a pretty good pick, considering. Pretty much full logo and silk writing (infamous for wiping off real easily) and even the small date codes (uc: 11-1959).
As they were supposed to, these are used but obviously super strong tubes. They give about the most gain I've ever had in my amp (lowest necessary volume levels, actually).
Critically speaking, I can't say, both from the first listen and after two hours of listening, that these are perfect tubes. I'm starting to understand what people mean by 6DJ8 tubes being "superior" to 12Ax7 types all things considered. These Tele tubes are awesome but not god tier, despite being pretty close to the best you can find in the 12Ax7 families.
Still, I'm not trying to make it sound like they're bad, it's quite the opposite in fact; I'm just giving truthful impressions in all absolutes. Like I said, these are great! People say they're "thin and airy". While I get the airy part, these are definitely not thin; if anything they have a pretty thick and creamy (not warm) midrange and tight deeeeep controlled bass (the most infra I've ever heard on my amp, and that's saying a lot). Highs are definitely well extended (the Tele reputation), without a hint of sibilance or piercing pain like some people say. These tubes do "come on strong" depending on the types of music you're listening to though. Since they're very balanced and extended, the music can kind of spill all of its guts at you in ways you're not used to.
They have this odd sense of deep detail and control, but at the sense time they make you feel like you're not hearing the last word in resolution or focus. It's weird, you hear everything but it all sounds so breezy and soft that you don't think you're hearing the absolute maximum of details, but you actually are... You'd have to try it to get what I mean.
Compared to my EI 12AX7 with Tele smooth -later- plates, the genuine ribbed Tele have more energy and extention. The EI are warmer and more "harmonically rich" like the guitar crowd says, probably a bit less detailed, though like I said the details on the ribbed Tele don'tt sound like details, whereas details on the EI sound like you're getting pretty good resolution and focus. I know, I'm explaining this poorly...
Anyway, very nice tubes the ribbed Tele are, but I'm still quite fond of my smooth plate EI. I'll give my final comments when I get a chance to AB both directly. Unless I get my Orange Globes first, obviously lol.