• Country
• Germany

• Manufacturer / Brand
• Radiofrequenz GmbH; Berlin-Friedenau (später Loewe)

• Year
• 1925/1926

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 16280

• • Brand: Ges. für Radiotelephonie mbH

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

• Number of Tubes
• 2

• Valves / Tubes

• Main principle
• TRF with regeneration; 1 AF stage(s)

• Tuned circuits
• 1 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Storage and/or dry batteries

• Loudspeaker
• Horn

• Material
• Wooden case, TUBES VISIBLE.

• from Radiomuseum.org
• Model: Orthophon OR71 - Radiofrequenz GmbH; Berlin-

• Notes
• Audion, NF, integrierter Trichter.

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Mentioned in
• Funkgeschichte der GFGF (8966)

• Picture reference
• Das Modell ist im «Radiokatalog» (Erb) abgebildet.

Orthophon Beschreibung

122 KB

• Documents regarding this model

• Other Models

• Here you find 30 models, 20 with images and 5 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radiofrequenz GmbH; Berlin-Friedenau (später Loewe)