• Country
• Germany

• Manufacturer / Brand
• Nora, Aron, Heliowatt; Berlin

• Year
• 1933–1935

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 7964

• Number of Tubes
• 4

• Valves / Tubes
• RES094 A411 or RE034 RE034 RES164

• Main principle
• TRF with regeneration; 1 Special; 2 AF stage(s)

• Tuned circuits
• 2 AM circuit(s)

• Wave bands
• Broadcast, Long Wave and Short Wave.

• Power type and voltage
• Storage and/or dry batteries / 100+4 Volt

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

• Material
• Bakelite case

• from Radiomuseum.org
• Model: B421 - Nora, Aron, Heliowatt; Berlin

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 340 x 265 x 253 mm / 13.4 x 10.4 x 10 inch

• Notes

• Wie B421L, nur ohne eingebautem Lautsprecher.

• Price in first year of sale
• 130.00 RM +

• Source of data
• Radio-Zentrale Prohaska 1933/34 / Radiokatalog Band 1, Ernst Erb

• Mentioned in
• Radio-Katalog Fricke, Radio Groß-Vertrieb, 1934/35

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

• Other Models

• Here you find 633 models, 556 with images and 342 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Nora, Aron, Heliowatt; Berlin