KVN-49 black-and-white television receiver.

Black and white televisionsDomesticThe television receiver of the black-and-white image "KVN-49" has been produced since the beginning of 1949. Famous manufacturers: Aleksandrovskiy radiozavod. Baku Radio Plant. Voronezh plant "Electrosignal". Kiev plant "Mayak". Leningrad plant "Russia". Leningrad Research Institute of Television. Moscow Radio Plant. Novgorod plant "Quant". One of the first mass-produced serial TVs was the KVN-49, developed at the Leningrad Research Institute of Television in 1947 and released at its pilot plant in 1948 in an amount of 20 pieces. The combination "KVN" came from the first letters of the names of the developers: V.K.Kenigson, N.M. Varshavsky and I.A. Nikolaevsky, and the digital addition "49" was the year of the start of production. It is very difficult to understand the letters and numbers after "49", since the first televisions were called "KVN-49" (T-1) and "KVN-49" and "KVN-49-1", there were also upgrades "KVN-49" -A "and" KVN-49-B ". The first we will consider all the same the KVN-49-1 TV, which is a 16-tube direct amplification receiver. The use of such a scheme for the image channel made it possible to achieve clarity and stability of the picture, as well as the use of the spacing between the carrier frequencies of the image and sound as IF sound, the number of radio tubes in the receiver and its cost was reduced. The KVN-49-1 TV set is designed for reception in any of 3 channels. An image measuring 105x140 mm is reproduced on the screen of the LK-715-A picture tube, which was soon replaced by 18LK1B. The sound is reproduced by the 1GD-1 loudspeaker. The TV is powered from an alternating current network: 110, 127 or 220 V. Power consumption is 220 watts. The TV is made in a desktop design with dimensions 380x400x490 mm and weighing 29 kg. The TV has 11 control knobs, of which four main ones are brought out to the front wall, this is the contrast and volume on the left (bottom), on the right is the mains switch combined with brightness and focusing (below), the remaining 7 knobs are located on the right, on the side wall. On the back wall are located: antenna terminals, program selector, mains switching block and fuse. The sensitivity of the TV for the image and sound channels is 800 ... 1000 μV. Image resolution 350 ... 400 lines. At the end of the transmission, the TV was automatically disconnected from the network. Until 1951, a small series of televisions had the ability to receive programs in 2 standards, 441 and 625 lines.