• Year
  • 1929 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 130142

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

 Technical Specifications

  • Number of Tubes
  • 9
  • Main principle
  • TRF without regeneration; 2 AF stage(s); Neutrodyne
  • Tuned circuits
  • 4 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Direct Current supply (DC) / 105; 115; 125 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 35 cm = 13.8 inch
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: R-4 DC Ch= 7R + 8P - Edison, Thomas A., North
  • Shape
  • Console, Highboy (legs > 50 %).
  • Notes
  • Consists of Receiver unit 7-R and Power unit 8-P. Push-pull output stage.
    Model "R4" also incorporates the "Light-O-Matic" dial drive mechanism.
  • Circuit diagram reference
  • Rider's Perpetual, Volume 3 = 1933 and before

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