01 / SK 4 · 1956Dieter Rams and Hans Gugelot. Painted metal, wood and plastic; 58.4 × 29.2 × 24.1 cm. The clear hood, wooden sides, turntable and radio layout define this study. The concealed chassis is schematic.MoMA collection record Braun audio collection: SK series
02 / T3 · 1958Dieter Rams with the Ulm School of Design. Plastic casing; 15.2 × 8.3 × 4.1 cm. The component study includes the speaker, tuning assembly, transistor circuitry and four AA cells. Component placement is simplified.MoMA collection record Robert Davidson: photographs, chassis and specifications
05 / ET 66 · 1987Dietrich Lubs, within Dieter Rams’s Braun design team; the museum record credits both. 13.7 × 7.8 × 1.1 cm. Round convex keys and an eight-digit display. Key contacts and electronics are schematic.Museum Angewandte Kunst collection record Mark Adams on Dietrich Lubs and the ET 66
03 / TP 1 · 1959Plastic casings, an aluminium frame and a leather strap. The T4 radio and P1 player are removable modules. The underside pickup is represented as a simplified mechanism.MoMA: dimensions and materials Braun Audio: modular portable audio
04 / LE 1 · 1960Metal cabinet, perforated front and nickel-plated steel stand. Date and overall measurements follow MoMA; other archives date the design to 1959. Electrostatic layers are schematic, with exaggerated spacing and membrane thickness for visibility.MoMA: LE 1 Braun audio collection: photographs and specifications
06 / RT 20 · 1961Dieter Rams. Overall proportions follow SFMOMA; control arrangement and circular slotted grille follow archival photographs. The concealed valve chassis is schematic.SFMOMA: dimensions and attribution Cooper Hewitt: RT 20 design history
07 / HL 70 · 1971Reinhold Weiss and Jürgen Greubel. Dimensions and date follow MoMA. The cross-flow rotor, motor cylinder and transparent support follow photographs; concealed motor details are schematic.MoMA: HL 70
08 / AB 1 · 1987Dietrich Lubs. A compact square alarm clock with a circular dial. Dimensions are approximate; the quartz movement and gearing are schematic, not a working timekeeping simulation.Wright: AB 1 attribution, date and materials