[tubesrule]

Ford/Mercury offered AM/FM radios starting in 1963 in the Galaxie/Maurauder and Thunderbird with the Comet joining in 1964. The Mustang got AM/FM in 1965 and 8-track in 1966 (Ford was the first to offer a factory 8-track starting in Sep 1965 for the 1966 models). Aftermarket companies that built radios for specific cars like Automatic Radio offered AM/FM radios starting in 1964.

The earliest US factory FM I've had/known about was a companion unit for the 1958 Lincoln. It used tubes with a solid state vibrator power supply and connected to a dedicated jack on the factory Bendix radios.

The last of the all tube radios was for the most part in 1958. The last of the hybrid radios (space charge tubes with transistor audio outputs) was 1962. Factory multiplexed FM radios that used a companion decoder/amplifier started appearing in 1967/68 for GM and Ford.

There was never a US tube automotive FM stereo radio.