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I had my first AM band transistor radio -- it looked remarkably like the one in that ad, but I'm sure it wasn't a Motorola -- in the early 60s. Meanwhile, our 1959 Chevrolet station wagon still had a vacuum tube radio that had to "warm up" before it would play.
By the late 70s, or perhaps earlier, portable radios went to ICs (integrated circuits) instead of discrete transistors. I do still have a Sears brand AM/FM portable radio that I bought in 1975. It boasts of having 12 transistors, and it still works.
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