• Paese
• Gran Bretagna (Regno Unito)

• Produttore / Marca
• Kolster Brandes Ltd. (KB, K.B., ITT); Foots Cray; GB

• Anno
• 1951 ??

• Categoria
• Radio (o sintonizzatore del dopoguerra WW2)

• Radiomuseum.org ID
• 232526

Clicca sulla miniatura dello schema per richiederlo come documento gratuito.

• Numero di tubi
• 4

• Valvole
• 6BE6 6BA6 7C6 6G6G

• Numero di transistor

• Semiconduttori
• 6SR7_Vibrator

• Principio generale
• Supereterodina (in generale); ZF/IF 422 kHz; 2 Stadi BF

• N. di circuiti accordati
• 6 Circuiti Mod. Amp. (AM)

• Gamme d'onda
• Onde medie (OM) e più di 2 gamme di onde corte (> 2 x OC).

• Tensioni di funzionamento
• Batteria di accumulatori, per tutto (es. autoradio, radio amatoriali) / 6 Volt

• Altoparlante
• AP magnetodinamico (magnete permanente e bobina mobile) / Ø 8 inch = 20.3 cm

• Materiali
• Mobile in legno

• Radiomuseum.org
• Modello: GR13T - Kolster Brandes Ltd. KB, K.B.,

• Forma
• Soprammobile con qualsiasi forma (non saputo).

• Dimensioni (LxAxP)
• 485 x 305 x 200 mm / 19.1 x 12 x 7.9 inch

• Annotazioni

• 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).

• Peso netto
• 6.5 kg / 14 lb 5.1 oz (14.317 lb)

• Autore
• Modello inviato da Michael Watterson. Utilizzare "Proponi modifica" per inviare ulteriori dati.

• Altri modelli

• In questo link sono elencati 415 modelli, di cui 372 con immagini e 253 con schemi.
  Elenco delle radio e altri apparecchi della Kolster Brandes Ltd. (KB, K.B., ITT); Foots Cray; GB