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Radio for the Navy "Thunderstorm" released a small series since 1938. The receiver is intended for radio installation of submarines and warships. The reception range from 12 kHz to 1.5 MHz, is divided into 7 sub-bands. Superheterodyne with one transformation. 12 metal tubes. TLF, TLG. The average sensitivity is 10 µV in SLT and 5 µV in THL. Unfortunately there is no photo or picture of the radio.