doublet 77437 Madrigal AY3

Radio Instruments Ltd (RI)., London

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  • Year
  • 9999
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 228868

 Technical Specifications

  • Number of Tubes
  • 4
  • Valves / Tubes
  • Main principle
  • TRF with regeneration
  • Tuned circuits
  • 2 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Alternating Current supply (AC) / 100-120; 200-250 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: doublet 77437 [Madrigal AY3] - Radio Instruments Ltd RI.,
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Notes

  • Anode-bend detection. Series connected battery valves are used. Rectification folowing the mains transformer is by a bridge-connected metal rectifier. Wave range: 225-550 and 950-2000 meters. There is also a DC model that operates on 200 to 250 volts. Sold with a moving coil loudspeaker cabinet, with metal rectifier. The complete set forms a low-boy cabinet.

    Marconi 1931 valve catalogue lists a  "Radio Instruments"  4 valve Madrigal
    MS4 MS4 MH4 MPT4 U10 (rather than Metal Rectifier)
    This may be a 1930 version of the same model.

  • Author
  • Model page created by John Koster. See "Data change" for further contributors.

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