The portable models 452-P/CDD6 are broadcast and the models 453-P/CDD7, two-band receivers housed in cabinets attractively finished in leatherette. They embody a hinged front cover which effectively protects the dial and controls from damage, dust and weather. Features of their design include: Tropic-proof construction, automatic volume control, magnetite cores in I.F. transformers, broadcast oscillator coils and loop coupling coils, air-dielectric trimming capacitors, straight-line tuning dial.