• Country
• Norway

• Manufacturer / Brand
• Radiofon, Einar Rustad; Kristiania (Oslo)

• Year
• 1923

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 308209

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

• Number of Tubes
• 4

• Valves / Tubes
• D-II D-I D-II D-II

• Main principle
• TRF with regeneration

• Tuned circuits
• 2 AM circuit(s)

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

• Power type and voltage
• Storage and/or dry batteries / 4 & 80 Volt

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

• Material
• Wooden case

• from Radiomuseum.org
• Model: Radiofon/Erres G Combination - Radiofon, Einar Rustad;

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 460 x 205 x 108 mm / 18.1 x 8.1 x 4.3 inch

• Notes

• Radioset, blocksystem, consisting of four connectable elements.

  In brown oak cabinets with ebonite front, Bakelite knobs and brass coupling strips.

  The set consists of a tuning unit with a fixed and a movable coil, a HF unit with 1 tube and 1 coil, a detector unit with 1 tube and a power amplifier with 2 tubes, probably all bright emitters. The remains of 2 Philips D-II tubes were found inside the unit, so the probable valve line-up was Philips D-II (HF unit), Philips D-I (detector) and 2 x Philips D-II (amplifier). All coils have a solid and a hollow pin. The coils are British, with a pin diameter of 4.8 mm and a center distance of 19 mm. One of the coupling transformers is from the German Böco, and the other is stamped DPM. There are no other marked parts.

  The texts "Erres G RADIOFON" and "R.S. Stokvis & Zonen" are placed on the HF unit. The other cabinets have the text "RADIOFON", with the exception of the last, the power amplifier. An Erres G, made by Dutch firm N.S.F., was introduced in the Netherlands in 1923, but it does not look much like this unit. The only similarity is that it is also an HF module. The link with Dutch trade firm R.S. Stokvis & Zonen (using the brand name Erres) is still not clear.

• Author
• Model page created by John Koster. See "Data change" for further contributors.

• Other Models

• Here you find 1 models, 1 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Radiofon, Einar Rustad; Kristiania (Oslo)