Few people have heard of it, yet many consider John Blankenbaker's KENBAK-1 to be the first commercial personal computer.

Koss introduced these headphones over 40 years ago, and they remain affordable favorites to this day.

Miniature reel-to-reel tape recorders


Roland Schellin's miniature tape recorder collection includes some stunning examples of 1950s and 1960s technology, including the world's first entirely solid state recorder - the Teltape. The most fascinating device of all is the tiny Minifon Mi51, which recorded on wire rather than magnetic tape:

The Minifon Mi51 was the world's first miniature magnetic recorder. The product line was built in Hanover, starting in 1951. Even the USA was not in a position to build such equipment at that point. The Minifon is a wire recorder that incorporates two miniature vacuum tubes . Three different batteries are necessary for operation: one for the motor, along with two to power the vacuum tube heater elements and anodes. The Minifon measured 17 x 11 x 3.5 cm - about the size of a wallet - and was intended to capture clandestine recordings. Corresponding accessories included a wrist-watch microphone and telephone adapter.

Roland Schellin's miniature recorders [German, lots of pix. Via wileywiggins.com]


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