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FU1 (Alter Art): E 445 Bs


Funksammler

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The Fu1 (Alter Art) or "old type" set contained the all purpose "Tornister Empfänger", short for "portable receiver". It covered the spectrum from long wave to shortwave. The old type of Tornister Empfänger was the Telefunken E 445 Bs which was first introduced in 1931.

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The receiver used four RE074 valves a two stage receiver design (HF amplifier - Detector - audio amplifier). The controls allowed adjustment of the antenna coupling, tuning and feedback from the detector into the HF circuit.The plug-in coil unit each covered two or three bands (the short wave unit is shown in the receiver) A potentiometer control allowed the adjustment of the filament voltage (the 4.8NC10 filament battery would slowly drop in voltage when discharged) while a toggle switch controlled the use of a audio filter. The main switch was used to switch the receiver off and on and for controlling the audio amplification stage; when set to 3R (3 Röhre), the receiver used a single audio amplifier valve while on 4R (4 Röhre) and extra audio amplifier valve was engaged:

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 The receiver was mounted in a carrying case together with the batteries for the power supply (a 90 V anode battery + a 4.8NC10 filament voltage battery (4.8 V NiCad, 10 Ah). A small accesories compartment allowed headphones, manual and antenna wire to be carried with the set :

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To cover the Long, Medium and Shortwave bands, the receiver used three plug-in coil units. The two coil units not in use were stored in a special coil box while other spares and accessories could be carried in the "Transportkasten FU21", which also held the spare valves and accessories for the 5 W.S. transmitter.:

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In 1937, the E 445 Bs "Tornister Empfänger" was replaced with the E 976 Bs "Tornister Empfänger b" also build by Telefunken. The coil units were now miniaturerised so that all bands could be included on a single coil "revolver", negating the need for plug-in units. The photographs shows one of the final E 445 Bs' and one of the first Torn.E.b's, both from 1937 they symbolise the changing of the guard of the general purpose receiver:

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Prior to 1937 the E445Bs was widely used in the FU1, FU9 and FU11 sets. It was widely used in different types of radio cars (e.g. in the first type Kfz.17), but also in armoured cars like early models of the Sd.Kfz 232.

After the Torn.E.b was introduced, the E445Bs was relegated to training and second line duty where they remained in use until the end of the war. Most WW2 Funkers would have been familiar with E445Bs as they learned the principles of radio reception.

 

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The are the same dimensions. The size of the Torn.E.b + battery box were clearly based on the size of the E445Bs which is also equal to the 5 W.S. and the FU21 box. So Telefunken clearly wanted to keep a standard size for all boxes in the set.

regards,

Funksammler

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