• Country
• Germany

• Manufacturer / Brand
• UNBEKANNTE FIRMA D / A / CH - Siehe Anleitung unter der «Firma»

• Year
• 1920 ??

• Category
• Radio module pre 1926 (not a part, not a key)

• Radiomuseum.org ID
• 140645

• • alternative name: Unknown, Custom Built

• Number of Tubes
• 4

• Valves / Tubes
• RE11 RE11 RE11 RE11

• Main principle
• TRF (Tuned-Radio-Frequency but use of regeneration unknown)

• Tuned circuits
• 1 AM circuit(s)

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

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Audion mit 3-stuf.HF - UNBEKANNTE FIRMA D / A / CH -

• Shape
• Tablemodel, Box - most often with Lid (NOT slant panel).

• Dimensions (WHD)
• 250 x 260 x 100 mm / 9.8 x 10.2 x 3.9 inch

• Notes
• 3 aperiodische HF-Stufen gefolgt von einem Audion

• Net weight (2.2 lb = 1 kg)
• 1.5 kg / 3 lb 4.9 oz (3.304 lb)

• Source of data
• - - Data from my own collection

• Author
• Model page created by Michael Arnoldt. See "Data change" for further contributors.

• Other Models

• Here you find 465 models, 403 with images and 40 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from UNBEKANNTE FIRMA D / A / CH - Siehe Anleitung unter der «Firma»