GR13T

Kolster Brandes Ltd. (KB, K.B., ITT); Foots Cray; GB

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  • Année
  • 1951 ??
  • Catégorie
  • Radio - ou tuner d'après la guerre 1939-45
  • Radiomuseum.org ID
  • 232526

Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.

 Spécifications techniques

  • No. de tubes
  • 4
  • No. de transistors
  • Principe général
  • Super hétérodyne (en général); FI/IF 422 kHz; 2 Etage(s) BF
  • Circuits accordés
  • 6 Circuits MA (AM)
  • Gammes d'ondes
  • PO et plus que 2 x OC
  • Tension / type courant
  • Accumulateur (par exemple pour autoradios ou radio) / 6 Volt
  • Haut-parleur
  • HP dynamique à aimant permanent + bobine mobile / Ø 8 inch = 20.3 cm
  • Matière
  • Boitier en bois
  • De Radiomuseum.org
  • Modèle: GR13T - Kolster Brandes Ltd. KB, K.B.,
  • Forme
  • Modèle de table générique
  • Dimensions (LHP)
  • 485 x 305 x 200 mm / 19.1 x 12 x 7.9 inch
  • Remarques

  • Probably an export model as it's 6V DC only, no long wave and not listed in usual UK service sources.

    Features

    • Aerial/Earth sockets (no built in aerial).
    • PU/Gram sockets.
    • External speaker sockets with screw switch.
    • Plessey 6SR7 6V synchronous vibrator pack (not a metal 6SR7 tube/valve) so no HT rectifier required.
    • Power cord has 10 amp fuse on side of chassis.
    • Two  scale lamps/dial bulbs.

    8 Wavebands:

    • MW 185 ... 550 m
    • SW 35 ... 100 m (3 to 9.5 MHz)
    • 31m
    • 25m
    • 19m
    • 15m
    • 13m
    • 11m

    The OAK V5211 6V synchronous vibrator pack (Split Reed type) appears to be identical connections to the Plessey 6SR7 unit and has required specification (100Hz, 6V, 4A input max., isolated HT reed). The separate HT "synchronous rectifier" reed is connected to the +6V input filter rather than 0V. The "snubber" network across the secondary of the transformer is critical and is 10K Ohms in series with 10nF @ 1000V. A 1500V or 2000V rated part for replacement would be reasonable. But the actual capacitor and resistor values are related to the vibrator frequency and transformer 

    Total consumption is 2.3A @ 6V excluding two scale lamps / dial bulbs. The example model had 2 x 300mA bulbs but 150mA or less types (@ 7V rating) would seem reasonable.

    A small "shutter" is driven across tuning scale by wave change switch to indicate selected band.

    The RF/IF is similar to Kolster Brandes LR30 and the 7C6 6G6G Audio is similar to many 6V vibrator pack driven car radios, with addition of an active tone control that seems similar to some Kolster Brandes mains models (but not the LR30).

  • Poids net
  • 6.5 kg / 14 lb 5.1 oz (14.317 lb)
  • Auteur
  • Modèle crée par Michael Watterson. Voir les propositions de modification pour les contributeurs supplémentaires.

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Le modèle fait partie des collections des membres suivants.

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