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Since 1938, the T-37 Radio Tank Plant No. 7 has been serially produced by the Tube Radio Network T7. The T-37 model is a five-tube direct-gain radio receiver with AC power. The radio works in 2 ranges of 1853 ... 726 meters and 576 ... 220 meters (Long and Medium waves). Rated output power 1 watt. Power consumption 60 watts. In 1939, the radio was upgraded. More information in the documentation.