I was checking for data on an FT5154 transistor of 1976 kit.
An old German transistor data manual showed it equivalent to 2N5154.
A straight block of 50 or so others listed in that manual from FT1724 to
FT5154 showed the same 2N equivalence.
Anyone know of a general rule ?
FT??? in hundreds don't seem to have direct number 2N equivalents

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