Since the first quarter of 1958, the &quot;Surprise&quot; radio has been produced by the Znamya Truda Saratov plant. The Surprise radio receiver is assembled on seven transistors according to a superheterodyne circuit and is designed to receive programs from broadcasting stations operating in the following ranges: DV (723 ... 2000 m) and SV (187.5 ... 577 m) waves. The nominal output power of the receiver amplifier is 100 mW, the maximum is 250 mW, the audio frequency band reproduced by a small-sized dynamic loudspeaker 0.5GD-11 is 350 ... 6000 Hz. The intermediate frequency is 465 kHz. The receiver is powered by four KNP-0.42 batteries. Duration of continuous work at an average volume of 15 hours. The sensitivity of the model in both ranges is 7 ... 10 mV / m. The dimensions of the radio receiver are 150x80x32 mm. Weight 520 grams.

Here is what Yuri Alexandrovich wrote to me about the radio receiver and the factory: 

Yu.A. I have other information, unofficial, according to the stories of old-timers who were engaged in electronics in the 50 ... 60 years of the XX century. The radio receiver was apparently prepared for release at the Korpus manufacturing plant, as we call it Khrushchevsky. The Surprise radio has never been seen on sale, perhaps it never made it to serial production. My two copies from a person who worked at the &quot;Corpus&quot; factory in the 70s ... 80s of the XX century. And at the plant &quot;Znamya Truda&quot; in 1986 XX century. I started my career, but then I was not interested in radio receivers and for 6 months of work I have never heard of a Surprise receiver. At the same time, at one military enterprise of the city, corps from the Surprise receivers stood in boxes and, according to an eyewitness, about a hundred. Nobody knew why they were there and used them as soap dishes, but more than 20 years have passed since the date of their release.

Description and diagram of the &quot;Surprise&quot; radio receiver in 

... Description of the &quot;Surprise&quot; radio receiver and its diagram in the magazine

radio &quot;Surprise&quot; and its diagram. Photo by Valery Manyuk, Minsk and Yuri Alexandrovich Morozov, Saratov.

Radio `` Surprise ''.