Battery radio `` PTB-47 ''.

Amplifying and broadcasting equipmentSince 1947, the battery radio "PTB-47" has been produced by the Petropavlovsk plant named after S.M. Kirov. The PTB-47 radio is a battery-powered version of the PTS-47 network radio. The radio receiver uses eight radio tubes of the series: SO-242, SO-258, 2K2M (3), 2Zh2M (2). It is designed to operate in six bands: standard DV, CB and four HF sub-bands, smoothly covering the range from 19 to 76 meters. Receiver sensitivity 50 ... 80 μV. The output power is about 100 mW. The receiver is powered by 3S-L-30 filament batteries and BAS-80-U1 anode batteries. The radio was intended for rural radio broadcasting centers, in areas without electricity.