Rare Vintage Soviet USSR ???? Stereo Headphones Fenix Phoenix TDS-10. Tested and working. Stereophonic headphones "Phoenix TDS-10" from the beginning of 1989 released Lviv PO named after the 50th anniversary of October. Dynamic stereo headsets '' Phoenix TDS-10 '' are intended for listening to mono and stereo programs reproduced by consumer radio equipment having a jack for connecting stereo headsets. Rated electrical resistance of 8 ohms Rated power 1 mW The nominal frequency range is 20 ... 20000 Hz Total harmonic coefficient in the frequency range of 100 ... 2000 Hz, with a sound pressure level of 94 dB, not more than 1%. The mass of stereo phones Phoenix TDS-10 is not more than 0.3 kg. Stereophones were available in two design options. Will be shipped by Air Mail International priority mail. Thanks for looking... I will ship to worldwide.