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U4; Ingelen, (ID = 73627) Radio
Ingelen,: U4 [Radio] ID = 73627 432x489
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For model U4, Ingelen, Elektrotechnische Fabrik Ing. Ludwig Neumann GmbH; Wien:
Ingelen U4 mit Figaro LS
Country:  Austria
Manufacturer / Brand:  Ingelen, Elektrotechnische Fabrik Ing. Ludwig Neumann GmbH; Wien
Elektrot.Fabrik Ludwig Neumann
Year: 1929 Category: Broadcast Receiver - or past WW2 Tuner
Valves / Tubes 4: E442 E424 E438 B405 or B443
Main principle TRF without regeneration
Power type and voltage Storage and/or dry batteries
Loudspeaker - For headphones or amp.
Power out
from Model: U4 - Ingelen, Elektrotechnische
Material Wooden case
Notes Schirmgitter-Fernempfänger. Wellenbereich 200 bis 2000 m. Preis incl. Röhren. (auch als Baukasten).
Price in first year of sale 500.00 ATS
External source of data E. Erb 3-907007-36-0
Source of data Radiokatalog Band 2, Ernst Erb

All listed radios etc. from Ingelen, Elektrotechnische Fabrik Ing. Ludwig Neumann GmbH; Wien
Here you find 438 models, 385 with images and 318 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.