Tubes Asylum

Are these even Siemens tubes?

67.163.212.50

Sigmund

Edits: 06/09/25 06/09/25 06/09/25 06/09/25 06/09/25

Follow Ups:

See link in body of post - Joe Appierto 01:04:04 06/10/25 (7)
Should tell you everything you need to know.
Joe
- Philips/Telefunken/Siemens Codes and Pictures (Open in New Window)
- Thanks, Joe. This is marginally helpful. Nothing about dates, though. - Sigmund 06:39:10 06/10/25 (6)
  Thanks, again.
  - Try this link - Tre' 12:47:03 06/14/25 (0)
    .
    Have Fun and Enjoy the Music
    "Still Working the Problem"
    - http://www.tube-classics.de/TC/Tubes/Valvo/Phlipscode.htm (Open in New Window)
  - RE: Thanks, Joe. This is marginally helpful. Nothing about dates, though. - Joe Appierto 09:40:49 06/10/25 (4)
    You're welcome.
    It isn't possible to directly tell the decade of production only the year within a decade. Both of the tubes you have pictured are E88CC/6922 (type A in the production code). E188CC/7308 have a G indication in the production code. The tube pictured on the right (A6 0G) is most likely 1980. The tube on the right(A3 hard to tell bottom characters) is earlier production possibly 1977.
    I've included a couple of photos of Siemens E188CC from 1978 that I used to have for comparison purposes.
    Joe
    
    Edits: 06/10/25
    - Thank you, Joe. This is more helpful. - Sigmund 10:14:39 06/10/25 (3)
      :)
      - RE: Thank you, Joe. This is more helpful. - Nunki 09:39:01 06/13/25 (2)
        
        In Reply to: RE: Thank you, Joe. This is more helpful. posted by Sigmund on June 10, 2025 at 10:14:39
        
        somewhere i read that siemens E88CC/6022/E188CC/Cca with that large getter support and imprinted codes are not true siemens tubes but where made by TUNGSRAM (Hungary) for siemens.
        
        but perhaps this imformation was wrong...
        
        Tungsrams have a distinctly solid signature sound. - Sigmund 17:53:27 07/08/25 (0)
        
        In Reply to: RE: Thank you, Joe. This is more helpful. posted by Nunki on June 13, 2025 at 09:39:01
        
        Back in the day, I bought several pairs of them from a couple of guys in Hungary, if I remember correctly. They all had the same sound signature, a solidity and stability to the sound in addition to clear, detailed extension. They were good buys.
        
        RE: Thank you, Joe. This is more helpful. - Joe Appierto 13:12:17 06/13/25 (0)
        
        In Reply to: RE: Thank you, Joe. This is more helpful. posted by Nunki on June 13, 2025 at 09:39:01
        
        I guess that is possible but if so then they're using Siemens tooling. The other two pictures I'm posting above are from the same sleeve of six that I had. Note the four-seamed top which was a hallmark of both Philips and Siemens. I have seen four-seamed Japanese Matsushita tubes but that was a case where Matsushita bought the tooling from Mullard.
        Joe
RE: Are these even Siemens tubes? - Sigmund 19:50:30 06/09/25 (0)
see post below.
Are these even Siemens tubes? - Sigmund 19:35:05 06/09/25 (5)
I have a pair of what I believe are Siemens E188cc tubes branded Cca. The date codes don't look like Siemens codes I've seen; there are no phis on either tube.

Can anyone tell me what I have? And what the dates codes mean?

Thank you
- RE: Are these even Siemens tubes? - The Dill 19:38:42 06/09/25 (1)
  Have you checked out Brent Jessee's website?
  
  https://www.audiotubes.com/6dj8.htm
  - His site is useless to me. - Sigmund 19:48:54 06/09/25 (0)
    nt
- RE: Are these even Siemens tubes? - Sigmund 19:37:26 06/09/25 (2)
  I have a pair of what I believe are Siemens E188cc tubes branded Cca. The date codes don't look like Siemens codes I've seen; there are no phis on either tube.
  I know that 6922 tube date codes are A or A phi and Cca tube codes are G or G phi.
  Can anyone tell me what I have? And what the dates codes mean?
  Thank you.
  
  Edits: 06/09/25
  - This post has all the pictures. - Sigmund 19:47:09 06/09/25 (1)
    I have a pair of what I believe are Siemens E188cc tubes branded Cca. The date codes don't look like Siemens codes I've seen; there are no phis on either tube.
    
    I know that their 6922 tube date codes begin with A and their Cca codes begin with G.
    
    Can anyone tell me what I have? And what the dates codes mean?
    
    Thank you
    - RE: This post has all the pictures. - Sigmund 19:52:19 06/09/25 (0)
      I have a pair of what I believe are Siemens E188cc tubes branded Cca. The date codes don't look like Siemens codes I've seen; there are no phis on either tube.
      
      I know that their 6922 tubes have date codes beginning with A and their Cca tube codes begin with G.
      
      Can anyone tell me what I have? And what the dates codes mean?
      
      Thank you
- Sigmund 19:30:46 06/09/25 (0)
RE: Are these even Siemens tubes? - The Dill 18:32:55 06/09/25 (1)
Siemens 6922 tubes have date codes beginning with an A; their Cca tubes have date codes beginning with a G.

For example: Date codes A phi 3 7J, October 1967 and A phi 6 OG July 1966. Military grade, made in Germany.
- Thank you, Dill. - Sigmund 19:20:38 06/09/25 (0)
  no text.
  
  Edits: 06/09/25

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