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Where are you from?

Where are you from?

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I have several MV lamps from the 1970s with first letter code j,o and y. Those letters aren't in my code list (1953-79). All these lamps are made in Germany but where?
Ah btw, this lamp is made 1976.

IMG_5432lg.jpg IMG_5445lg.JPG IMG_6511lg.JPG IMG_6508lg.JPG

Light Information

Light Information

Manufacturer:OSRAM
Lamp
Lamp Type:MV
Base:E27
Shape/Finish:E
Electrical
Wattage:80
Physical/Production
Factory Location:that's the question
Fabrication Date:1976

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Date added:May 26, 2017
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Date Time:2017:05:20 08:49:22
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James
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Jun 05, 2017 at 10:00 AM Author: James
I have a similar problem in deciphering where such lamps were made, because these letters are not included in Osram's date code forms from the time when this system was introduced.

I think the most likely is that they were produced at the present Berlin HID plant on Nonnendammallee (area of Spandau). Normally Osram's older HID lamps had the quarterly date codes beginning with k,m,n,p and were produced at the old Werk-S on Helmholzstra├če, Charlottenburg, Berlin. That was a very old factory which Osram had started in 1899. In 1969/70 it was decided to relocate production to newer sites, with the discharge lamps moving to the brand new Werk S-B (sometimes called Berlin-B) on Nonnendammallee. There was a period of about 2 years from 1972-74 when production was gradually transferred from Werk S to Werk S-B, and I suppose to avoid confusion, the extra letters you have seen might have been introduced to identify the B plant.

Question then is what other letters were used to denote the quarters, and in which sequence! Missing from the original schedule are the letters i,j,l,o,q,y. Its good that you have seen j,o,y in use (I had only come across j and o before). Since all the other factories applied their four quarterly letters in alphabetical sequence, and you have seen j,o,y in use, we have to decide if the fourth one used would have been i,l or q. Since i and l were never used as year letters, my best guess would be that from 1972 when Spandau opened, that factory used the quarterly letters j,o,q,y.

Thanks for your insights here, I think with this input we may have now cracked the last part of Osram's marking system used after 1953!

Do you happen to know how the pre-1953 Osram lamps were marked? I have seen many which have a small letter followed by two numbers, but so far no clear idea to work out what those mean.
magslight
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Jul 21, 2017 at 10:25 AM Author: magslight
Ah that's it probably! And I also have one HQL 125W with a q as first letter (qsz 1979). In that year they changed the date list because I also have a HWL 160W with date code qs1 (1979). My last lamps with old Werk letters k,m,n,p are HQLS 80W kzX (1971) and HQJ 400W kvX (1973). My oldest lamps with the j,o,q,y as first letter are HWLS 160W yVY (1973)and HQLS 80W ovZ (1973). Later made was my L20W in U-shape with the code jpZ (1976) which also has the typically Spandau end caps. Resume: I guess ,so far I look at my lamps, the factory S changed their production to factory S-B in 1973.
For month identification it surely works same as k,m,n,p but with the letters j,o,q,y , as you said.
Only thing I don't understand completely is why the second letters (for year identification) are sometimes in upper case letters instead of lower case letters. (Examples: yEX 1974,yVY (1973)

For the pre-1953 Osram date code list I guess the letters mean the factory and are the same as the ones since 1953 .

I have a tiny question noone could answer me untill now: What means the letter in the cube on old lamps ? (A,B,C,T...) The latest ones with showing that print are flourescent tubes.
TL8W
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Lee


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Jul 15, 2018 at 06:27 AM Author: TL8W
The case of the year letter is dependent on the half-year. Quarters 1 and 2 (first half of year)>>lower case year letter; Q3 and Q4 go upper case. So in your examples yEX and yVY are from the second half of the year. As we have now established j/o/q/y as the factory quarter letters, yEX is Oct 1974 and yVY is Nov 1973.

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TL8W
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Lee


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Jul 15, 2018 at 06:28 AM Author: TL8W
So this lamp is made in January 1976

We do not have to agree on anything to be kind to one another. The ability to be civil is available to everyone on earth, for free.

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