Portable transistor radio receiver-4th-class `` Almaz ''.
Radio and electrical constructors, sets.Radio receiving devicesThe portable transistor radio receiver of the 4th class "Almaz" has been produced by the Leningrad plants "Novator and" Radiopribor "since the beginning of 1964. The small-sized transistor radio receiver" Almaz ", along with high performance characteristics, has good electro-acoustic parameters. transistors and one crystal diode. Reception of radio stations is carried out on an internal magnetic antenna. The power source is a rechargeable battery of type 7D-0.1 or battery Krona. Power supply 9 V. Rated output power ULF - 50 mW. The receiver has the ranges of MW and LW. Sensitivity Receiver 1.5 mV / m in the MW range and 2.5 mV / m in the LW range.Selectivity in the adjacent channel in the MW range 16 dB, LW 20 dB.Selectivity in the image channel is about 20 dB. Intermediate frequency 465 kHz Frequency response sound pressure 450 ... 3000 Hz. The coefficient of nonlinear distortion is not more than 8%. The main parameters of the receiver are saved when reducing the voltage of the power source to 7.2 V, and its operation when the voltage drops to 5.6 V. The body of the model is made of colored impact-resistant polystyrene with dimensions of 134x83x34 mm and a weight of 380 g. The scale of the model is horizontal, graduated in hundreds of kilohertz. To carry and protect the case from damage, it fits in a leather case. The knob and volume control with the power switch are located on the right side of the side of the case. On the side wall there are also sockets for an external antenna and a headphone. The range selector lever and battery compartment are located at the rear. The receiver was produced in different design options until mid-1972. The Radiopribor plant also produced repair kits for radio workshops and radio amateurs (as a radio designer), consisting of a housing with a loudspeaker, a radio receiver board (assembled and tuned or a board and accessories) from which it was possible to assemble a radio receiver similar to the factory radio. The cost of such a receiver was 10 ... 17 rubles cheaper than the factory one.
