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The year and month started to be used at this point after 1956, so the change code is not really necessary in newer tubes to pinpoint a manufacture date.The purpose of these codes, indeed all of the change code, is unclear from original Dutch Philips documentation.This will reduce the number of code choices you have, and the tube type codes of the tubes you use the most will become committed to memory, as they never change.Here is an example of a Mullard Blackburn, UK factory date code: The first line is r X2. 2 is the change code, probably a 2nd production run with updates from run #1. The B is Blackburn, UK Mullard factory, the 2 is 1962, the J is October, and the 5 is the 5th week of the month. Mullard tubes are the only coded tubes I have seen that SOMETIMES do this, another clue to a genuine Mullard tube.The theory that they pertain to individual batches of tubes or "production runs" seems to be the most plausible, and is the purpose I have accepted as to their meaning.In the code used after 1955, each month is represented by a single letter in the sequence shown on the next chart.
Please let me know if you have any questions on using this page. Now that we have a little one at home, it is much harder to get out for date night.We have been getting really creative over here to still have quality time date nights that can be done after the kiddo is in bed.This material is presented "as found" and "as is" for your use and enjoyment. I hope it helps you identify that rare European tube you have been searching for!