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Therefore, batch 0 was 0, batch 1 was 1, batch 10 was A, and so forth until the end of the list.
Use the charts below to see if the week codes even apply to your tube..... For the most part, on tubes commonly found in circulation today, the code is located on the side of the glass in dark grey paint, down low just above the bottom.It follows this convention before 1956: Where TT stands for the one, two, or three symbol tube type code, C is the change code, F is the factory and/or country code, and M is the month of manufacture.On the bottom of octal base tubes the code is usually FM/TTC.But it is nice to have these codes available if you are not sure what type of tube you have.I have decided to post the scans of the original Philips Holland lists that were created at their headquaters in Eindhoven, The Netherlands.
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