Radiola network lamp "Riga T-51" from the beginning of 1950 was produced at the Riga plant "Radio engineering". Perhaps the highest achievement of household radio receiving equipment of the early fifties in the USSR was the console radio of the highest class '' Riga T-51 '', developed at the Riga plant '' Radio Engineering '' in 1949. She absorbed the entire production experience and theoretical developments of the time in the field of consumer radio. Radiola is assembled in a case with a size of 1300x500x1000 mm and consists of a turntable with an automatic change of ten plates (from the start of production they released a radio line with a turntable without automatic change of plates) and an electronic part on the 21st lamp. The electrical and acoustic parameters of the radioli were high, which was provided by the following circuit solutions: a complex acoustic unit of three LF heads and one horn RF head; powerful output push-pull cascade on 4 6P3S lamps (2 pairs each); deep adjustment of timbres on the low and treble frequencies and loudness; three-circuit IF filters with automatically adjustable bandwidth depending on the input signal level; effective AGC system; silent setting block. Radiol was difficult to manufacture, expensive at a price and not launched into mass production. To date, several copies of such radiols have been preserved. Presented to JVStalin one of the radios is (in working condition) in the Polytechnic Museum of the city of Moscow. One copy was donated by Mao Jie Dong and is in China. The third radio is in the collection of the Museum of Radio Engineering in Riga. On the website of the photo are radiograms from the Polytechnic Museum and the Museum of Radio Engineering. Ragged lamps were used in the radio unit. For example, in the IF path, 6K7 lamps are installed, and the local oscillator is assembled on a rare, for that time, 6Z3P finger type. All the others are single-ended octal lamps, common for those years. Here is a list of lamps that, with a power supply unit, consumed a total of 270 watts of power from the mains: 6K4P, 6A7, 6K7 (4), 6G3P, 6P6S, 6B8, 6Ð¥6С, 6С5 (2), 6Ð8С, 6П3С (4), 6Е5С, 5Ц4С (3 ).Wave bands: LW, NE, KV-1 13 m, KV-2 16 m, KV-3 19 m, KV-4 25 m, KV-5 31 m, KV-6 41 m, KV-7 49 m. How many It was made radio "Riga T-51" - is unknown, but at least there were several dozen.