From what I've been able to determine, no SF author predicted the lowly transistor before its discovery at Bell Labs in 1947.
Although its cousin, the semiconductor crystal, was demonstrated as early as 1906, no one made the "quantum leap" beyond the technology of vacuum tubes to solid-state transistors until Bell hit upon the first device out of numerous studies and patents, some of which had been around for decades. SF stories of incredibly-miniaturized electronics all appear to have come after that.
(Somebody, if I'm wrong about this, let us know!)
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