• Country
• Austria

• Manufacturer / Brand
• Radio Amateur, Monatsschrift für Radio, Tonfilm und Fernsehen (ÖRA); Wien

• Year
• 1927

• Category
• Kit (Parts plus instruction) or building instructions only

• Radiomuseum.org ID
• 222966

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

• Number of Tubes
• 4

• Valves / Tubes

• Main principle
• TRF with regeneration; Reflex

• Wave bands
• Broadcast (MW) and Long Wave.

• Power type and voltage
• Storage and/or dry batteries / 4 & 48 & 90 & 120 Volt

• Loudspeaker
• - This model requires external speaker(s).

• Material
• Wooden case

• from Radiomuseum.org
• Model: Neutroduplex Bauanleitung - Radio Amateur, Monatsschrift f

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

• Dimensions (WHD)
• 650 x 180 x 200 mm / 25.6 x 7.1 x 7.9 inch

• Notes
• Neutroduplex = 1.Röhre Reflex für HF und NF. und Solodyne). Wellenbereich 150 - 2000m. Bauanleitung von Oskar Ruda. Röhrentypen nach Wahl.

• Mentioned in
• Radio-Amateur Wien (RA, 46), (Österreichischer Radio Amateur, ÖRA) (ÖRA Heft 6/1927)

• Author
• Model page created by Rudolf Müller. See "Data change" for further contributors.

• Other Models

• Here you find 24 models, 13 with images and 24 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radio Amateur, Monatsschrift für Radio, Tonfilm und Fernsehen (ÖRA); Wien