The network tube electric microphone "Kolster Brandes ORP10" (Tunetime) was produced possibly since 1956 by the company "Kolster Brandes", Great Britain, London.
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The microphone is assembled on a double ECL82 radio tube.
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There are four rotation speeds of the disk: 16, 33, 45 and 78 rpm.
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The microphone is powered from an alternating current 200 ... 250 volts, 50 Hz.
,86e6f450b8cc469628ba70bf2947b049
Power consumption 33 W (18 W motor and 15 W amplifier).
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The maximum output power is 2 W, with a THD of about 5%.
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The range of reproducible sound frequencies by sound pressure is 120 ... 9000 Hz.
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Dimensions of the model 380x229x394 mm.
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Weight 8.6 kg.
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