2771 Vacuum Tube Detector

Amrad Corporation; Medford Hillside (MA)

Data
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  • Year
  • 1923
  • Category
  • Radio module pre 1926 (not a part, not a key)
  • Radiomuseum.org ID
  • 32600
    • alternative name: American Radio & Research

 Technical Specifications

  • Number of Tubes
  • 1
  • Main principle
  • Detector with Vacuum Tube (Valve), no tuner
  • Wave bands
  • - without
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 2771 Vacuum Tube Detector - Amrad Corporation; Medford
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Dimensions (WHD)
  • 5 x 5 x 7.5 inch / 127 x 127 x 191 mm
  • Notes
  • The "Radio Collector's Guide 1921-1932" by Morgan E. McMahon lists this model on page 25 for 1923 under model 2771 with code "C" in the column for "Ciruits & Stages". This is explained on page 15 as "Crystal Receiver". Guest Joseph Woychowski, USA, has sent us photos as proof that it is in fact a self contained single vacuum tube detector . It's construction is basic, containing a UV tube socket, 5 ohm rheostat, grid condenser and a grid-leak resistor. The UV-200 is the tube of choice.
  • Net weight (2.2 lb = 1 kg)
  • 1.1 kg / 2 lb 6.8 oz (2.423 lb)
  • Price in first year of sale
  • 20.00 $
  • External source of data
  • Ernst Erb

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The model 2771 is part of the collections of the following members.

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