What If the Transistor Was Invented in 1921?

Eleanor Voss had rebuilt the same crystal radio detector four times that week, and four times it had done the one thing a detector was never supposed to do: not just pass the signal through, but make it louder. Her instructor at the technical institute called it a wiring fault and told her to replace the galena crystal. She replaced it. The new crystal, cut from the same batch, did the exact same thing.

It was November 1921, in a drafty workshop above her father's hardware store in Pittsburgh, and Eleanor was twenty-three years old, one of perhaps six women in the entire city who had been allowed to study electrical engineering, admitted only because the war had thinned the ranks of men enough to make space. She was used to being told her results were wrong before anyone had checked them.

She checked this one herself, for six straight nights, running a weak signal through the crystal and measuring what came out the other side with a borrowed galvanometer. The output was larger than the input. Not by a trick of resonance, not by any explanation the textbooks offered. The crystal itself, under the right pressure of a fine wire point, was amplifying. She did not yet have a name for what she had built. She would spend the next two years finding one.