• Year
  • 1921
  • Category
  • Radio module pre 1926 (not a part, not a key)
  • Radiomuseum.org ID
  • 201524
    • alternative name: Lee De Forest Mfg.

 Technical Specifications

  • Number of Tubes
  • 3
  • Main principle
  • Detector with Vacuum Tube (Valve), no tuner; 2 AF stage(s)
  • Wave bands
  • - without
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Detector and Two Stage Amplifier SP-4 - DeForest Radio Telephone &
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Dimensions (WHD)
  • 8.8 x 7.4 x 0 inch / 224 x 188 x 0 mm
  • Notes
  • The De Forest Type SP-4 vacuum tube detector cabinet with two-stage audio amplifier.
  • Net weight (2.2 lb = 1 kg)
  • 12 lb (12 lb 0 oz) / 5.448 kg
  • Literature/Schematics (1)
  • Deforest Radio Equipment Catalog H page 8
  • Author
  • Model page created by Alan Larsen. See "Data change" for further contributors.

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The model Detector and Two Stage Amplifier is part of the collections of the following members.

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