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The low-frequency amplifier "ULF-3" presumably since 1960 produced the Odessa experimental plant "Red October".
ULF is assembled on 6N9S, 6P6S octal radio tubes and 6Ts5S kenotron and is intended for a physics classroom, where it was possible to demonstrate sound amplification from a microphone, pickup, detector receiver, etc.
A 3.6 ohm load amplifier develops an output power of about 4 watts.
Sound frequency range 80 ... 8000 Hz.
Sensitivity from microphone 3.5 mV, pickup 100 mV.
Power consumption 50 watts.
Dimensions of the amplifier 230x180x150 mm.
Weight is 3.7 kg.
Presumably since 1969, the plant has been producing the same amplifier, but on 6N2P, 6P14P finger radio tubes and 6Ts4P kenotron.
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