The transistor radio came out in the 1960s but it was the Sony Walkman, introduced in 1974, that turned the compact cassette into the purveyor of hi-fi quality music, of your choice, on the move.
Without a built-in speaker people listened via headphones shutting out the world around them.
The ultimate model of the walkman is the Sony WM-D6C Professional corder, that had a production run from 1984 until 2002. In a world used to seeing changes in design and features of everything and fashion changing by the season this is an unsually long production run.
The WM-D6C was used by radio stations, recording studios, professional musicians, natutralists and a decerning public. It was renown for it's extreme high quality recordings that rivaled non-portable cassette decks.
It is also an elegant design -'a small object of desire' than has a timeless feel and look.
Comments
The Sony Walkman was first introduced in 1979 not 1974, although it's essential engineering elements were certainly around from the early 1970's.