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RE: E188CC identification
Posted by beto1 on December 25, 2020 at 08:45:43:
OK, find more information specific to Mullard here: https://mullard.org/blogs/news/mullard-valve-etched-codes-how-to-interpret-them
So, R2F1 must be:
R= Mullard, Mitcham
2=1952 or 1962 or 1972 (The second character gives the year of manufacture with decade differentiation being by number of characters and logo shape. and If its a 4 character code, the valve was produced post 1960, so reduced to 1962 or 1972, no logo)
but this would contradict what is written in the first rectangle, 7501, which according to other publications, such as the one I quoted in the first post, would mean, January 1975