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ANTENTOP- 02- 2004, # 006   The First Steps (Part- I)

 

 

"Radiolina"

They were assembled in a separate case by 2,3 and 4 pieces. The anodes of the receiver's tubes were battery-sourced. In the first lots of the "Radiolina" the tubes R-5 with tungsten cathode were installed using the current of about 0,6 A. That is why accumulating battery was needed to feed the heater. The necessity of frequent recharging the battery strongly restricted the use of the radio set even in towns and cities. When new tubes of the "micro"-type appeared which used 10 times less energy there was a possibility to change the accumulators for galvanic elements. The "Radiolina" set had only one resonance coil and a very low sensitivity and selectivity. An electromagnetic horn speaker "DP" or (later) a diffusion-type "Rekord-2" was included into the set.

Almost simultaneously with the "Radiolina" a cheaper single-tube regenerative receiver "R-1" was produced in which headphones were used.

The next series of Soviet radio receivers became really "mass media". It was a line of type "B" sets designed by E.Borusewich (an engineer of the Trust of Low-Voltage Factories). The production of those sets opened in 1926 with models "BV" (one-tube), "BT" (three-tube) and "B4" (four-tube). The "BT" and "B4" had equivalent schemes - two tunable coils and the structure 1-V-1 and 1-V-2 respectively. The "BV"-receiver could work with a usual crystal detector without any batteries. In all the stages of these radios 3-electrode tubes of the single type were used. The R-sets worked within 250-2000 m bands and enabled to receive broadcasts on the electromagnetic speaker "Rekord". In 1928 an improved version of the "B4"-set appeared, which was named "B4N". It was also tuned out by the "Moselectric Works" (in Moscow). A more powerful tube of UO-3 type was used in audio output. The model "B4Z" ("B4"-closed) became a further modification of the "B4N" set. The scheme being unchanged all the tubes were put inside a case.

 

R-1

 

 

 

BV

 

 

 

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