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In Reply to: RE: Siemens E88CC date code help needed posted by Sancho on September 18, 2014 at 11:57:26
roland,
is january 1973 theoretically possible also? or were those tubes no longer built in the early 70ties?
Nunki
The times, they are changing...
Follow Ups:
I'm fairly certain I read somewhere that the etching stopped in the late 1960s and they switched to the stamped silver plate inside the tube. Yeah, here it is:
http://www.tubemuseum.org/SearchResults.asp?Cat=24
see the blue text at the very bottom.
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