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RE: Are these even Siemens tubes?






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

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