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In Reply to: RE: CCa Siemens Identification (with actual photos) posted by JazzDude on February 12, 2021 at 22:40:06:
Thank you for writing your opinion.
That is precisely the question: It does not correspond to what is defined by the pages I mention, such as the Siemens code system, which has 3 lines. Regarding the possibility that they are made in Eastern Europe, according to The Tube Museum NY, they are after the closing of the Halske factory in 1979. So the code does not fit. Regarding the 4 seams, I have seen others without them, like this one:
https://www.audioantiquary.com/en-us/siemens-cca-a6/nos880124/
also supposedly from 1968. It also does not have the 3-line code.
Some of the Tube Museum identifiers that correspond to the specimen I am looking at are:
double-stage getter frame-grid construction, Gray separator, After 1966 the acid-codes may change to codes stamped on tiny metal rectangles soldered onto the sides.
Regarding the 4 seams they mention, they do not make it clear if these are for tubes prior to 1966, when they change to the code system stamped on the metal plate.
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- RE: CCa Siemens Identification (with actual photos) - beto1 05:18:35 02/13/21 (0)