Tubes Asylum

Who made this Telefunken labeled 12AX7?

24.59.229.201

Byrd69

A

Doesn't have a diamond. Has a round recessed area on bottom.
Doesn't have as wide of an indentation of the getter ring into the support post.
Has codes in the bottom edge I'm not familiar with.
First code on the bottom line looks like a @.
Has four well defined seams on top.
EI?

Your interest may vary but the results will be same. (Byrd 2020)

I can't compete with the dead. (Buck W. 2010)

Cowards can't be heroes. (Byrd 2017)

Why don't catfish have kittens? (Moe Howard 1937)

Edits: 03/03/24

Follow Ups:

Probably a better tube than the Telefunken anyway. nt - Sondek 13:33:24 03/05/24 (7)
- RE: Probably a better tube than the Telefunken anyway. nt - dgaapc7 03:55:56 03/06/24 (2)
  I have to disagree. I bought some EI 12ax7's years ago to use in a CJ pv8. I bought 6 since I had heard scuttlebutt about their unreliability. It was true. I bought 6. Four of them went noisy within hours. Two were usable. They sounded okay, but nothing special. They certainly didn't compare with nos Tele's that I got shortly thereafter. The Tele's sounded more powerful, more full bodied, yet clearer in detail.
  LowIQ
  - Testing and selection? - Sondek 09:20:29 03/06/24 (0)
    My pre uses 4 of them. All tested, selected by CAT.
    
    In twelve years never ever had one even so much as hiccup. Quiet as stones.
  - totally agree - Story 04:31:02 03/06/24 (0)
    ...had the same problem finding good EI's many years ago, maybe 25?
    
    The ribbed plate Tele's had a much greater consistency, and sound wise, for many years, they were the standard go to 12ax7. Same with the smooth plate.
    
    The EI's had great promise as a replacement but didn't fulfil that.
- Love Ei - Jon L 16:41:58 03/05/24 (1)
  12AX7 in my Elekit 300B amp right now.
  The trick with Ei tubes is buying from a vendor who takes returns if tube becomes noisy, which tends to happen to quite a percentage of them, but the ones that survive the initial days/weeks seem to last just as long as other brands..
  - I have a few of those tubes - Tre' 14:49:05 03/07/24 (0)
    .
    Have Fun and Enjoy the Music
    "Still Working the Problem"
- Went through my box of fakes - Byrd69 16:41:06 03/05/24 (1)
  While cleaning crap out, I pawed through a box of "not the real thing" tubes. These were in there. I never looked into them until this week.
  
  They're decent tubes? Most of my experiences with non-USA tubes have been with Telefunken, Mullard and Amperex.
  
  Your interest may vary but the results will be same. (Byrd 2020)
  
  I can't compete with the dead. (Buck W. 2010)
  
  Cowards can't be heroes. (Byrd 2017)
  
  Why don't catfish have kittens? (Moe Howard 1937)
  - RE: Went through my box of fakes - Sondek 16:44:36 03/05/24 (0)
    Yep.
    
    Good tubes. Very good tubes.
    
    Use them in my CAT preamp.
Ei - Yugoslavia - opalize 16:22:06 03/04/24 (0)
as Tom Bavis said.

It looks to me like it was re-labeled to deceive. But you're looking for the right features by which to identify a genuine Telefunken.
RE: Who made this Telefunken labeled 12AX7? - Tom Bavis 08:27:00 03/04/24 (0)
Half circle with a dot is code for EI.

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