Osram Four New Music Magnet, a vintage tabletop valve radio dating back to approximately 1930. Device Details: The radio is housed in a walnut (I believe) cabinet with a lift-up lid that reveals its internal components. Internal Components: It features three prominent vertical aluminum cases (screening cans) that cover the radio's coils. Technical Specifications: The "Four" refers to its four-valve circuit, which typically includes two stages of RF amplification with screen-grid tetrodes, a detector stage, and a triode output stage.