Been thinking about the "mystery" tubes where we do not know who made them (yet).
Did you ever hear of a company called Johnson Controls? Probably not. Well, this is what they do:
- World’s largest manufacturer of lead acid automotive batteries for virtually every type of passenger car, light truck and utility vehicle.
- Lead acid batteries sold under private label brands as well as our own VARTA®, Heliar®, LTH® and OPTIMA® brand names. Major OEMs and aftermarket retailers include Daimler, General Motors, BMW, Ford, Toyota, Hyundai, Kia, Volkswagen, SAIC, Bosch, Walmart, Halfords, Interstate Battery System of America, Advance Auto Parts, and AutoZone.
In other words, they manufacture automotive batteries for almost all major brands of cars worldwide.
Seems that they prefer to be anonymous. You may think that you have a Ford, AC-Delco, Walmart, Interstate or AutoZone battery, but they are all made by the same corporation. (I am sure that they are made to different specifications etc.)
Now, translating this concept to tubes, which factory in the past seems most likely to make very high quality tubes, and mainly for others (and very few with their own name on them)?
My hunch is that it is Ei (Elektronska Industrija) in Yugoslavia. Originally they purchased Phillips machines and later Telefunken machines. The original licencing from Phillips started in 1959.
In a documentary of Ei (Youtube) the narrator says that they make tubes for many brands, including Phillips, Siemens and Telefunken. (54 sec mark, http://www.youtube.com/watch?v=fxXrfU36aY8)
I seem to remember from the clips that maximum production was 17 million tubes per year.
Your thoughts and comments are invited......
Edited by mordy - 8/17/13 at 9:33pm