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The network tube radio "Kolster Brandes 321" has been produced since 1931 by the company "Kolster Brandes", Great Britain.
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The radio receiver is built according to a regenerative scheme on four radio tubes, one of which is a rectifier.
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The model has two controls for a rough and smooth approach to the regeneration threshold.
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The radio receiver operates in the long and medium wave ranges with overlapping margins.
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The radio is powered by an alternating current network with a voltage of 180, 210 and 250 volts (switchable).
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The speaker uses a loudspeaker with a diameter of 20.3 cm. The maximum output power is 1.5 W.
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The dimensions of the radio receiver are 368 x 394 x 203 mm.
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Weight is about 5 kg.
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