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TV b / w images "Sapphire 23TB-406D" since 1992 produced the Ryazan plant "Red flag". TV is designed to receive programs in the MV and UHF range. Sensitivity in the MW / UHF ranges of 40/70 µV. Resolution 350 lines. The rated output power of the sound channel is 100 mW. Frequency range 400 ... 3550 Hz. Power consumption 30 watts. TV dimensions - 340x330x280 mm. Weight 6.5 kg. At the same time, the plant produced the Sapphire 31TB-406D TV with the same design and wiring diagram, similar in design but with a large kinescope.