Note Filter 358

MIM, Marconi International Marine; Chelmsford Essex

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  • Année
  • 1930 ??
  • Catégorie
  • Amplificateur BF ou mélangeur BF
  • Radiomuseum.org ID
  • 257257

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 Spécifications techniques

  • No. de tubes
  • 3
  • Lampes / Tubes
  • Principe général
  • Amplification audio
  • Gammes d'ondes
  • - sans
  • Tension / type courant
  • Piles (rechargeables ou/et sèches) / 2 or 4 or 6 & 72 Volt
  • Haut-parleur
  • - - Pas de sortie basse fréquence
  • Matière
  • Boitier métallique
  • De Radiomuseum.org
  • Modèle: Note Filter 358 - MIM, Marconi International
  • Forme
  • Gros appareil industriel ou militaire (> 20 kg)
  • Remarques

  • The note filter Type 358 consists of three stages of AF transformers with variable cores, the secondary of each transformer being tuned in each case to the required AF frequency range. It may be tuned to accept any "note" from approx. 800 to 1,200 cycles.

    The device is specifically designed for operation with receiver Type 352, and suitable for working with either 2, 4, or 6-volt valves, the anode voltage being of the order of 72 volts.

    A three-position switch determines the mode of operation. In mode "in", the note filter follows the AF valve of the 352 receiver. In the "off" position, filaments are disconnected and there is no through circuit to the headphones. Position "out" has the filaments equally disconnected, but a through circuit is arranged between the telephones and the receiver.

    Amplification and selectivity of the note filter can be controlled by means of a filament rheostat.

  • Littérature
  • - - Manufacturers Literature

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