• Country
• Germany

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

• Year
• 1960

• Category
• Microphone or Pick-up element

• Radiomuseum.org ID
• 71576

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

• Number of Tubes
• 1

• Valves / Tubes
• AC701k

• Power type and voltage
• Powered by external power supply or a main unit. / 4 & 120 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: KM254 - Neumann, Georg, Laboratorium f

• Dimensions (WHD)
• 21 x 148 x 21 mm / 0.8 x 5.8 x 0.8 inch

• Notes
• Kondensator Röhrenmikrofon. Nierencharakteristik. Übertragungsbereich 40 bis 15.000Hz. Impedanz 200 Ohm. Empfindlichkeit 1mV/µb. Röhre AC701k. Heizspannung 4V, Anodenspannung 120V.

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

• Source of data
• Radiokatalog Band 2, Ernst Erb

• Mentioned in
• -- Original prospect or advert

• 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