• Country
• Germany

• Manufacturer / Brand
• Neumann & Co, Georg; Gefell

• Year
• 1975 ??

• Category
• Microphone or Pick-up element

• Radiomuseum.org ID
• 155286

• Number of Transistors
• 2

• Semiconductors

• Main principle
• Audio-Amplification; none

• Wave bands
• - without

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

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: Mikrofonvorverstärker MV 690 - Neumann & Co, Georg; Gefell

• Shape
• Miscellaneous shapes - described under notes.

• Dimensions (WHD)
• 25 x 132 x 25 mm / 1 x 5.2 x 1 inch

• Notes
• Kleinmikrophon-Verstärker (Korpus) mit Feldeffekttransistor für die Kapseln M69, M94, M71 und andere. Anschluss über Kupplungssteckdose vom Typ Gefell NS-84 7-Pol. Speisung aus Netzgerät N690.

• Net weight (2.2 lb = 1 kg)
• 0.140 kg / 0 lb 4.9 oz (0.308 lb)

• Author
• Model page created by Nikolaus Löwe. See "Data change" for further contributors.

• Other Models

• Here you find 63 models, 58 with images and 12 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Neumann & Co, Georg; Gefell