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The bus speakerphone "AGU-10-4", presumably since 1975, was produced by the Ryazan Radio Plant.
ASU practically repeats `` ASU-10-3 '', representing a bass and speaker amplifier for alerting passengers of a bus from a microphone and broadcasting radio programs.
The rated output power of the device is 6 watts, maximum 10 watts.
The range of reproducible frequencies is 150 ... 7000 Hz.
The kit includes an MF-7B microphone and four 3GDSH-2-4 loudspeakers on reflective boards.
Presumably since 1982, the device was transferred to silicon transistors.
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