Inverse Duplex Reflex 4DL (4D) UV sockets

Grimes, David Inc.; Staten Island, NY

  • Year
  • 1924 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 206149

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • TRF without regeneration; Reflex
  • Tuned circuits
  • 3 AM circuit(s)
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Inverse Duplex Reflex 4DL [UV sockets] - Grimes, David Inc.; Staten
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Notes
  • Every known printed source (see ref.) calls it 4DL while the Radio itself is stamped 4D only (see label). See also the model which followed: Grimes Own Kit (Inverse Duplex System) with an inversed double reflex.

    There is a two step Volume Control:
    HIGH: two AF stages reflexed in Inverse Duplex
    LOW: only one AF reflex stage in single Reflex, not inverse duplex.
  • Circuit diagram reference
  • Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

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