Strictly speaking, all "transistor" radios and "solid state" radios use the same technology, though in the world of radio collecting, "transistor" means a solid state portable. To recap a transistor set. Typical circuit diagram. ..Pioneer>

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Same company that did the Yorks down below. Not related to Firestone.

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Careful, the earphone jack on this rechargeable set is "hot" to the powerline!

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The above center AM transistor is Lafayette #17-0102L, on the right is an AM/FM set Lafayette #99-3524
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The above Lafayette looks just like this above Koyo 10 transistor.
My brother got the Lafayette new, model FS-129L, mid 60's.

1960:

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"Nipco 8 HI-FI 8 transistor" from Japan, of course..

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This radio above uses no transistors unless you count the thousands of transistors inside the two IC's used.

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- Inside Starfire

A Starfire 12 transistor radio. All they really did was take a 7 transistor circuit and added in parallel a 2nd transistor to each of the original transistors except for the audio preamp stage and the output stage driver. Thus a "12" transistor! The converter circuit, 1st IF, 2nd IF, and push-pull audio output stages all had paired transistors. Base to base, emitter to emitter, and collector to collector. This doesn't really add anything to the performance of the radio as only one of the pair (the one with the lower B-E voltage drop) will conduct any current and thus do all the work. It was just marketing hype.

In the USA, its AM band picks up a few nav beacons, on its FM band it gets a TV sound carrier.

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Just like my first radio, the Lafayette #17-0102L above

This one above is the 8 transistor version. A converter instead of a mixer transistor and an oscillator transistor, and only one instead of two audio driver transistors.

This above radio has an RF stage with 3 gang tuning cap. A good DXer.

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This radio has my name on it! model: 010