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Start-2 and Topaz-2 radio sets since the beginning of 1963 produced the Moscow State Radio Plant Red October, the Vladivostok Radiopribor plant and the Ulyanovsk EMZ (Topaz-2). Receivers are designed for reception in the range of LW and CB. They are assembled on 7 transistors in the general scheme, but differ in design and power sources. The sensitivity on the DV 2.0, SW 0.5 mV / m. The selectivity on the adjacent channel is 30 db, on the mirror one 26 db. PCh 465 kHz The receivers have AGC. Band of reproducible frequencies 450 ... 3000 Hz ,. Rated output power is 100 MW. In the absence of a signal, the current consumption is 4.5 ma. The Start-2 receiver is powered by a Krone battery (1L), and the Topaz-2 is powered by a 7D-0.1 battery or a Krone battery. The battery can be charged with the charger supplied. Battery life of the Krona-1L type with an average volume of about 15 hours. Receivers remain operational when the battery voltage drops to 5.6 volts. The receiver cascades have temperature and regime stabilization. Installation is made on a printed circuit board from getinaks. Copolymer body. On the right side of the receiver there is a jack for an outdoor antenna, on the left jack for connecting a telephone, the loudspeaker is turned off. On the back of the receiver Topaz-2 there are two pins for connecting the charger. For transfer, the receiver is placed in a leather case with a belt. The dimensions of the Topaz-2 radio receiver are 152x90x35 mm, the mass is 450 g, and the Start-2, respectively, 142x90x35 mm and 430 g. For a long time, a sticker was placed inside the back cover of the receiver, with the inscription "Topaz" and not "Topaz-2"; most likely, a backlog made for the Topaz receiver was used. Radio Plant "Red October" produced and a set of parts and assemblies (except the case) for self-assembled receiver "Topaz-2". The radio "Start-2" was released in a small amount and has not been produced since 1964.