RE: Thanks, Joe. This is marginally helpful. Nothing about dates, though.

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

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Follow Ups Full Thread

Topic - Are these even Siemens tubes? - Sigmund 16:27:41 06/09/25 (17)

See link in body of post - Joe Appierto 01:04:04 06/10/25 (6)

Thanks, Joe. This is marginally helpful. Nothing about dates, though. - Sigmund 06:39:10 06/10/25 (5)

Try this link - Tre' 12:47:03 06/14/25 (0)

RE: Thanks, Joe. This is marginally helpful. Nothing about dates, though. - Joe Appierto 09:40:49 06/10/25 (3)

Thank you, Joe. This is more helpful. - Sigmund 10:14:39 06/10/25 (2)

RE: Thank you, Joe. This is more helpful. - Nunki 09:39:01 06/13/25 (1)

RE: Thank you, Joe. This is more helpful. - Joe Appierto 13:12:17 06/13/25 (0)

RE: Are these even Siemens tubes? - Sigmund 19:50:30 06/09/25 (0)

Are these even Siemens tubes? - Sigmund 19:35:05 06/09/25 (5)

RE: Are these even Siemens tubes? - The Dill 19:38:42 06/09/25 (1)

His site is useless to me. - Sigmund 19:48:54 06/09/25 (0)

RE: Are these even Siemens tubes? - Sigmund 19:37:26 06/09/25 (2)

This post has all the pictures. - Sigmund 19:47:09 06/09/25 (1)

RE: This post has all the pictures. - Sigmund 19:52:19 06/09/25 (0)

- Sigmund 19:30:46 06/09/25 (0)

RE: Are these even Siemens tubes? - The Dill 18:32:55 06/09/25 (1)

Thank you, Dill. - Sigmund 19:20:38 06/09/25 (0)

Follow Ups

RE: Thanks, Joe. This is marginally helpful. Nothing about dates, though. - Joe Appierto 09:40:49 06/10/25 (3)

Thank you, Joe. This is more helpful. - Sigmund 10:14:39 06/10/25 (2)

RE: Thank you, Joe. This is more helpful. - Nunki 09:39:01 06/13/25 (1)

RE: Thank you, Joe. This is more helpful. - Joe Appierto 13:12:17 06/13/25 (0)

RE: Thanks, Joe. This is marginally helpful. Nothing about dates, though.

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