This radio receiver marked a major step forward for amateur radio enthusiasts. The simplicity of its construction, defined by Armstrong in 1922, enabled the production of miniaturised, portable and easy-to-use models. Its high-power short-wave reception made it possible to listen to stations worldwide ‘graphically’ with headphones, European stations ‘phonically’ and regional stations via the loudspeaker. Amateurs praised its reception quality: ‘I obtained results receiving English, Belgian and German stations on the headphones, and I had marvellous sound from Radio-Paris without interference or fading, better than with a 4-tube receiver.’ This model was presented at a lecture organised by the Radio-Club de France at the Sorbonne in December 1925, chaired by René Barthélemy and Édouard Belin. It was acquired in 1962, when Maurice Daumas was planning the reorganisation of this section of the museum.