Since 1950, the lamp network radio "Baltika" (RZ-1) produced the Riga Radio Factory VEF and the Gorky ZIL Plant. Since February 1950, at the Riga State Enterprise '' VEF '' (POB 45), and later at the Gorky Plant named after Lenin, they began mass production of a desktop superheterodyne radio receiver of the 2nd class '' Baltika '' (P3-1). Six-lamp receiver; 6A7, 6K3, 6G2, 6P6S, 6E5S, 5TS4S, works in the ranges: DV - 2000 ... 732 m, SV - 577 ... 187 m, KV1 - 76 ... 32.3 m, KV2 - 33.3 ... 24.8 m. The sensitivity on the LW, MW - 200 µV, KV - 300 mV, from the pickup jacks 0,25 V. Selectivity in adjacent channels 26 dB. The nominal output power of the amplifier on a 3GDMDP loudspeaker is at least 2 watts. The range of sound frequencies reproduced own speakers - 100 ... 4000 Hz. The power consumed from the mains is 70 watts. The body is made of wood, veneered, dimensions 560x360x280 mm. The mass of the receiver is 15 kg. Control knobs are located on the front panel; low left volume and network switch, large left tone switch, small right setting, and a large range switch and turn on the ULF input. At the rear, on the chassis are the antenna, ground, additional speaker, sound pickup and mains voltage switch jacks. The Baltika radio was moderated several times, at least two such upgrades are known. Information on such changes is available on the website of Nikolai Baranov from the mountains. Riga. Additional letters and the number "RZ-1" - probably reflect the names of the developer of the first (1) receiver circuit L.Ratiner and designer M.Zalevsky. GOST 5651-51 has not yet been involved, but many of the parameters of the Baltika radio have already been adjusted to it. An experimental series (~ 50 copies) of the Baltika radio receiver (P3-1) was released at the VEF plant in December 1949.