• Country
• Germany

• Manufacturer / Brand
• Neumann, Georg, Laboratorium für Elektroakustik GmbH; Berlin

• Year
• 1954–1959

• Category
• Microphone or Pick-up element

• Radiomuseum.org ID
• 71573

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

• Number of Tubes
• 1

• Valves / Tubes
• AC701k

• Wave bands
• - without

• Power type and voltage
• Powered by external power supply or a main unit.

• Material
• Metal case

• from Radiomuseum.org
• Model: KM54a - Neumann, Georg, Laboratorium f

• Dimensions (WHD)
• 21 x 130 x 21 mm / 0.8 x 5.1 x 0.8 inch

• Notes
• Kondensator-Röhrenmikrofon; Nierencharakteristik. Übertragungsbereich 40-15.000 Hz, Empfindlichkeit 1 mV/µbar, Impedanz 200 Ohm. Stromversorgung aus Netzgerät NKM.

• Net weight (2.2 lb = 1 kg)
• 0.1 kg / 0 lb 3.5 oz (0.22 lb)

• Price in first year of sale
• 520.00 DM

• Source of data
• HdB d.Rdf-& Ferns-GrH 1954/55 / Radiokatalog Band 2, Ernst Erb

• Author
• Model page created by Werner Raacke. See "Data change" for further contributors.

• Other Models

• Here you find 128 models, 118 with images and 47 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Neumann, Georg, Laboratorium für Elektroakustik GmbH; Berlin