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Head stereo phones "TPS-1" were produced from the beginning of 1984. Piezoelectric stereophone "TPS-1" are designed for individual listening to mono and stereo programs, from stereo equipment with a nominal output voltage of 5 to 30 V. A thin (10..15 micron) piezoelectric film serves as a radiating element. Main technical characteristics: Nominal frequency range 20 ... 20000 Hz. The rated voltage of the signal source is 30 V. The harmonic factor in the frequency range 100 ... 2000 Hz is 1%. The sound pressure level at a frequency of 500 Hz at a signal source voltage of 5 V is 94 dB. The electrical capacity of each phone is 0.015 ... 0.065 microfarad. The mass of stereo phones is 0.3 kg.