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I need to determinate the manufacturing place/year of this Siemens CCa. Having exhausted my typical sources of information, I still cannot determine.
Useless is data codes from:
The codes are on metal tag factory(see photographs):
On glass: 09029
Can anyone help?
Thanks in advance.
It looks like East German production, like this Mullard I have
thanks to your comment, I found this, and it is a lead of research:
That's an odd tube per my understanding of Siemens tubes of that era. I believe most if not all Siemens tubes made in Halske during the period that had silver tags had 3 lines of codes on the tags and the tops of the tubes would have 4 seams. I didn't notice any seams on your tube.
Your tube is missing the middle of the 3 lines of codes and note that the code particular to a Halske manufacture would be on that line. And there is no code for a factory within the 2 code lines on the tube's tag.
The 8J code, if it was a Halske Siemens, would indicate October 1968. 8 = 1968 and J = October. An "A" would indicate January.
Perhaps this is an East Euro made tube.
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:
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.
somebody once mentioned, those shaped siemens were made by tungsram (hungary).
Hi Nunki, thanks for writing.
You could elaborate a bit, because first time I hear this for a Siemens tube that could be dated 1968. Unless the code system changed after the Munich factory closure and confused those after 1979 with those made previously.
Anything is possible.
sorry beto, i can not help and i am astonished too about that tungsram-statement.
what i can say is, that "made in gemany" in case of doubt means nothing. european tube manufacturers printed on their tubes what they wanted. only an etched factory code is finally helpful imo.
ps: i just compared a tungsram E88CC with a siemens. the tungsram looks rather different and i am sure your CCa is a true siemens!!
Still not mine. I am researching before I buy. My local dealer has 3 of these, which he got from a former phone company warehouse. They are too expensive to buy and try, plus the ever present possibility that they are fakes or post Munich productions.
The use I will be putting them to is in my AN DAC. Some time ago I bought a pair of Mullard E188CC, which sound wonderful in the high and mid frequencies, but do not have good bass frequency extension and articulation in my equipment (I clarify), if I compare them with the stock EH tubes that the DAC came with. These EH's have terrific low frequency extension and punch, but sound horrible in the high and mid/high frequencies, full of grain and annoying after a while of listening.
I am now trying a pair of Amperex, orange globe, Holland made from 1966 that I got at a good price. Too early to be conclusive, because I got them a few hours ago, but they already sound quite a bit better down low and don't bother up top, even have more detail than the Mullard, so I can expect everything to improve even more in about 100 hours.
Regarding the Siemenes, they are a temptation, if I can confirm that they are the ones that have been reviewed by many as one of the best along the frequency range. I don't want to go with the hype, in any case, which is partly what keeps these prices high, along with scarcity. A cheap NOS tube may work better, even. You know, if a guy spend a fortune on these tubes, hardly admit publicly that an $80 a pair tube might sound better.
have a look at this (scroll down a bit). obviously LORENZ used very similar imprints in the web...
OK, interesting! Thanks Nunki.
So, Lorenz after 1958 manufactures its tubes in Stuttgard no longer as Lorenz AG but as Standard Elektrik Lorenz (SEL) and uses a 2-line code system.
But this information may mean that the information from the Tube Museum and Audiotubes.com could be incomplete and perhaps does not cover all production, especially from the late 1960s onwards.
Looking at the pictures of those SEL tubes,there is a difference on the board, if that means anything. On the Siemens the two lines of codes are separated by a space and the SEL has no space.
There is still room for more discussion on this point. There is missing information, perhaps because these are rare and expensive tubes and not so many people have been involved.
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