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Since 1947, the Punane-RET Tallinn Plant "Punane-RET" of the Estonian SSR has produced a radio network receiver lamp Punane-RET. Radio Punane-RET "VV-661" is a six-lamp superheterodyne class 2. The ranges of DV are 150 ... 410 kHz, CB 520 ... 1500 kHz, KV 6 ... 18.7 MHz. IF 465 kHz. Sensitivity on DV, ST ranges 150 µV, KV - 300 µV. The selectivity on the adjacent channel is 26 dB, the specular one on the DV and CB is 30 dB, on the HF - 12 dB. Rated output power 1.5 watts. The band of reproduced sound frequencies is 100 ... 3500 Hz. Power consumption 70 watts. Dimensions 610x340x260 mm. Weight 16 kg. For the period 1947 ... 1948, 5000 Punane-RET "VV-661" receivers were manufactured.