528LW

DeWald Radio Mfg. Corp., Pierce Airo Inc.

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  • Year
  • 1937 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 37479
    • Brand: Pierce Airo

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 4
  • Number of Transistors
  • Semiconductors
  • M55F
  • Main principle
  • TRF without regeneration; 1 AF stage(s)
  • Tuned circuits
  • 2 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • AC/DC-set / 105-125 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 528LW - DeWald Radio Mfg. Corp.,
  • Shape
  • Tablemodel without push buttons, Mantel/Midget/Compact up to 14
  • Dimensions (WHD)
  • 10.625 x 7.75 x 6.125 inch / 270 x 197 x 156 mm
  • Notes
  • The model DeWald 528 was made in two versions: A model 528 with braodsast only and a model 528LW with braodcast and long waves. See schematic and notes there. The M55F (M-55-F) is a ballast tube to compensate the voltage difference which use the pilot lamp and the 4 tubes in series which end up by only about 70 volts. The 25Z5 is used as a single way rectifier only.
  • Net weight (2.2 lb = 1 kg)
  • 5.15 lb (5 lb 2.4 oz) / 2.338 kg
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 8 = 1937 and before

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