Are these even Siemens tubes?

RE: Are these even Siemens tubes?, posted on June 9, 2025 at 18:32:55
The Dill Audiophile Posts: 2331 Location: Portland, Oregon Joined: July 1, 2004 Contributor Since: February 3, 2016	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. , posted on June 9, 2025 at 19:20:38
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007	no text.

, posted on June 9, 2025 at 19:30:46
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007

Are these even Siemens tubes?, posted on June 9, 2025 at 19:35:05
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007	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?, posted on June 9, 2025 at 19:37:26

Sigmund
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Location: Pittsburgh, PA
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Since: November 21, 2007

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.

RE: Are these even Siemens tubes?, posted on June 9, 2025 at 19:38:42
The Dill Audiophile Posts: 2331 Location: Portland, Oregon Joined: July 1, 2004 Contributor Since: February 3, 2016	Have you checked out Brent Jessee's website? https://www.audiotubes.com/6dj8.htm

This post has all the pictures. , posted on June 9, 2025 at 19:47:09
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007	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

His site is useless to me., posted on June 9, 2025 at 19:48:54
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007	nt

RE: Are these even Siemens tubes?, posted on June 9, 2025 at 19:50:30
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007	see post below.

RE: This post has all the pictures. , posted on June 9, 2025 at 19:52:19
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007	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

See link in body of post, posted on June 10, 2025 at 01:04:04

Joe Appierto
Audiophile

Posts: 1072
Location: Central NJ
Joined: January 3, 2004

Should tell you everything you need to know.
Joe

Philips/Telefunken/Siemens Codes and Pictures

Thanks, Joe. This is marginally helpful. Nothing about dates, though., posted on June 10, 2025 at 06:39:10
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007	Thanks, again.

RE: Thanks, Joe. This is marginally helpful. Nothing about dates, though., posted on June 10, 2025 at 09:40:49

Joe Appierto
Audiophile

Posts: 1072
Location: Central NJ
Joined: January 3, 2004

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

Thank you, Joe. This is more helpful., posted on June 10, 2025 at 10:14:39
Sigmund Audiophile Posts: 1397 Location: Pittsburgh, PA Joined: February 15, 2002 Contributor Since: November 21, 2007	:)

RE: Thank you, Joe. This is more helpful., posted on June 13, 2025 at 09:39:01
Nunki Audiophile Posts: 662 Joined: November 27, 2010	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...

RE: Thank you, Joe. This is more helpful., posted on June 13, 2025 at 13:12:17
Joe Appierto Audiophile Posts: 1072 Location: Central NJ Joined: January 3, 2004	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

Try this link, posted on June 14, 2025 at 12:47:03

Tre'
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Are these even Siemens tubes?

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