Netzanschlussgerät für Stereo-Mikrophon SM2 NSM

Neumann, Georg, Laboratorium für Elektroakustik GmbH; Berlin

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  • Year
  • 1960
  • Category
  • Power supply/conditioner or battery or charger 
  • Radiomuseum.org ID
  • 318869

 Technical Specifications

  • Number of Tubes
  • 1
  • Power type and voltage
  • Alternating Current supply (AC) / 110/220 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Netzanschlussgerät für Stereo-Mikrophon SM2 NSM - Neumann, Georg, Laboratorium f
  • Shape
  • Miscellaneous shapes - described under notes.
  • Dimensions (WHD)
  • 102 x 110 x 236 mm / 4 x 4.3 x 9.3 inch
  • Notes

  • Power supply for the SM2 and SM2c stereo microphone. Delivers 4.5V for tube heaters, 120V for plate supply, and 2x stepped variable control voltages from 0V to 79V, for remote-control of the directivity patterns of the two capsules. Heater supply is stabilized by three Stabilyt cells of 1.5V each. Plate supply is stabilized by a neon regulator.

    The NSM was followed by the NSMa, which was a complete redesign on a transistor basis.

    Attention: The SM2 has a pinout differing from SM23 and SM69, so PSUs must not be swapped! SM23 and SM69 use two separate heater connections for the two tubes inside, while the SM2 only uses one. Furthermore, the control voltages for SM23 and SM69 range from 0V to 120V, and thus exceed the limit of the SM2.

    Suitable original PSUs for SM2 and SM2c are NSM, NSMa, NSK, NSKt.

    For SM23, SM23c, SM69 (tube) use only NSMa 23, or two single power supplies like N52t, NN48b, or BB50, via the Z10 or Z11 adaptors.

     

  • Net weight (2.2 lb = 1 kg)
  • 2.5 kg / 5 lb 8.1 oz (5.507 lb)
  • Mentioned in
  • -- Original-techn. papers.
  • Author
  • Model page created by Nikolaus Löwe. See "Data change" for further contributors.

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The model Netzanschlussgerät für Stereo-Mikrophon SM2 is part of the collections of the following members.

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