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I have not noticed that kind of marks in any equipment I have worked on. Japanese equipment of that era is very poorly labeled inside, so I doubt that the marks are any type of code related to the circuit functions.
In later years, as you probably know, parts were often numbered in groups by their functions (Sony vertical circuit parts are in the 500s, etc.).
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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