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