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Re: Siemens CCa

Here is an example of the etched code.
AO (With a slash through the O)
1= (with a slash through the equal sign)
2E
Reads like this
A for internal type, O (with a slash)version 1
1 for year (1961), =(with a slash) Munic factory
2 second week, E for May
I maybe wrong, in that case feel free to correct me.

Picture at the link below.

Mail me offline if you want to know where to find this rare tube.

Yours sincerely
Roland J


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