The Rca Victor SHF-7 vacuum tube microphone has been produced since July 1957 by the Rca Victor Corporation in the United States.
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5 radio tubes.
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4 speeds of rotation of a disk: 78, 45, 33 and 16 rpm.
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Automatic plate change, from 5 to 12. Push-pull output stage.
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Rated output power 3.5 W, maximum up to 10 W.
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3 loudspeakers.
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The range of operating frequencies is from 200 ... 7000 Hz, to 90 ... 11000 Hz (depending on the plates and the speed of the disk).
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Separate tone controls.
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Supply voltage - AC mains 115 volts, 60 Hz.
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Power consumption dependent, from 40 to 65 watts.
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