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Siemens E188CC / Cca Date Coding

Can anyone tell me how to translate the date codes on Siemens E188CC and Cca tubes? I want to shop for a good pair from the early 60's but I'm not sure of how I can identify them positively.

Need help!

Thanks
gumps
1 response Add your response
mechans
3,048 posts
 
Check Brente Jesses website audiotubes.com I think he lists the German codes, I know the Phillips Mullard codes are there.
If you want a Siemens CCa I hope you got a good rate on your second mortage.
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