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Stereophonic head phones "TDS-101" (Echo) have been produced since 1980 in Kiev.
Phones are designed for high-quality listening to phonograms.
The phones used dynamic heads such as 0.5GD-36.
Nominal impedance 24 ohms.
The supplied voltage is 1 ... 3 V. The frequency range is 20 ... 20,000 Hz.
The distortion coefficient at a frequency of 1000 Hz is about 1%.
The volume control range is at least 20 dB.
The cord length is 2.9 m. The weight of the phones is 550 g.
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