• Year
  • 1934 ??
  • Category
  • Car Radio, perhaps also + sound player/recorder
  • Radiomuseum.org ID
  • 37646
    • Brand: Pierce Airo

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Superhet with RF-stage; ZF/IF 175 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Storage Battery for all (e.g. for car radios and amateur radios) / 6 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: 640 - DeWald Radio Mfg. Corp.,
  • Shape
  • Chassis only or for «building in»
  • Notes
  • Built-in vibrator HV power supply.
  • External source of data
  • Ernst Erb
  • Circuit diagram reference
  • Rider's Perpetual, Volume 5 = ca. 1934 and before

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