• Year
  • 1928–1930
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 5600

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 3
  • Main principle
  • TRF with regeneration; 2 AF stage(s)
  • Tuned circuits
  • 1 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Storage and/or dry batteries / 4 & 120 Volt
  • Loudspeaker
  • Magnetic loudspeaker (reed) generic.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Protos Rfe21 - Siemens & Halske, -Schuckert
  • Shape
  • Tablemodel, low profile (big size).
  • Dimensions (WHD)
  • 500 x 350 x 200 mm / 19.7 x 13.8 x 7.9 inch
  • Notes
  • Protos-LS (oben rundl.) mit 3-Rö[510,514,560]
  • Price in first year of sale
  • 150.00 RM +
  • Circuit diagram reference
  • Lange + FS-Bestückungstabellen
  • Picture reference
  • Das Modell ist im «Radiokatalog» (Erb) abgebildet.

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

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