• Country
• Germany

• Manufacturer / Brand
• Emud, Ernst Mästling; Ulm

• Year
• 1928/1929

• Category
• Audio Amplifier or -mixer

• Radiomuseum.org ID
• 1502

• Number of Tubes
• 3

• Valves / Tubes

• Main principle
• Audio-Amplification

• Power type and voltage
• Alternating Current supply (AC) / 110-220 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: V4D - Emud, Ernst Mästling; Ulm

• Notes
• Anzeigegerät

• Price in first year of sale
• 310.00 RM +

• Source of data
• Radio-Diehr, Berlin, 1928/1929 / Radiokatalog Band 1, Ernst Erb

• Other Models

• Here you find 421 models, 327 with images and 231 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Emud, Ernst Mästling; Ulm