• Country
• United States of America (USA)

• Manufacturer / Brand
• Grimes, David Inc.; Staten Island, NY

• Year
• 1924 ?

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 206149

• Number of Tubes
• 4

• Valves / Tubes
• UV199 UV199 UV199 UV199

• 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.

• Source of data
• The Radio Collector's Directory and Price Guide 1921 - 1965

• Circuit diagram reference
• Rider's Perpetual, Volume 1 = 1931/1934 (for 1919-1931)

• Mentioned in
• Radio Collector`s Guide 1921-1932

• Literature/Schematics (1)
• Collector's Guide to Antique Radios (6th edition)

• Author
• Model page created by Konrad Birkner † 12.08.2014. See "Data change" for further contributors.

• Other Models

• Here you find 17 models, 14 with images and 8 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Grimes, David Inc.; Staten Island, NY