Sixty years ago this month, the June 1965 issue of the British Radio Constructor magazine carried this ad for the Sinclair Micro 6 radio kit.

It was billed as the smallest and most private set available, but it would perform with fantastic efficiency in cars, buses, trains, or even steel framed buildings.  The crystal earphone ensured that it would interfere with nobody even in the most public places.

It was billed as a six-stage circuit, but used only three transistors.  They were reflexed to provide two stages of RF and three of AF, with two diodes serving as detector.  It covered the medium waves, and the ad assured that it would provide easy Luxemburg reception.

Building the set was said to be easy.