Sjurpriz 1957
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The portable transistor radio "Surprise" since 1957 produced the Voronezh radio plant. The transistor radio '' Surprise '' was produced in a small experimental series from September 1957. It is one of the first transistor receivers issued by the domestic industry in the amount of more than 3000 pieces. The radio is designed based on the previous model '' Satellite ''. Scheme, parameters and most of the parts used are also basically the same. The radio receiver is designed to receive broadcasting stations operating in the DV 723 ... 2000 m and CB 187.5 ... 577 m ranges. The nominal output power of the ULF is 200 mW, the maximum 300 mW, the sound frequency band reproduced by a compact dynamic loudspeaker is 0.5GD 11 not less than 150 ... 4000 Hz. The intermediate frequency is 465 kHz. Power is supplied from two KBS-L-0.5 electroplating batteries connected in series. The duration of the receiver from a set of 2 batteries 40 ... 60 hours. The case is made of wood and covered with decorative plastic. Case dimensions 220x157x70 mm. The weight of the receiver is 1.3 kg. Unlike the satellite radio receiver, the following changes were made to the Surprise circuit: The ULF type changed the output transistors from П6В to П16Б, the winding data of the output transformer was changed, winding I consists of 2x325 turns of PEL 0.18 wire, and winding II of 59 turns of the PEL wire is 0.35 and the modes of the transistors are changed accordingly in terms of 9 V. The efficiency is maintained when the supply voltage drops to 5.5 V. The receiver was produced until December 1958, while in the middle of 1958 of the year the decorative p speaker loudspeaker. The price of the radio receiver is 473 rubles 50 kopecks before the monetary reform of 1961.
Information from collection of Valery Khartchenko