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Фрагмент инструкции
How to change the sensitivity of the microphone? The circuit design incorporates the facility to increase the nominal sensitivity of the microphone by 10 dB. This basic change to the microphone’s data may be made by the user in the following manner: 1. Open the microphone according to the description in the last paragraph. 2. On the top left corner of the transformer board are three small p. c. board switches placed next to each other. Change all three switches to the opposite position with a small object, like ball-pen or similar. 3. Close the microphone in reverse order of the opening procedure. How to mount the microphone? A special shock mount/stand adapter H 15/T is provided and should always be used to mount the microphone on floor stands or booms. The clamp of the shockmount should be guided from the lower end of the microphone upwards until it is placed near the gravitational centre (slightly below the engraving). The shockmount can now be placed with the microphone on stands or booms with thread sizes of 3/8 or 5/8 inch. It may also be swivelled against the stand axis to suit the recording angle. Powering of the microphone: The required power unit N 12 VR is included in the delivery. It is clearly marked and quite obvious by connector type and size, how to connect the microphone to the power unit with the 10 m (30 ft.) multicore cable MK-Tube. The audio frequency may be taken from the power unit transformer balanced by a conventional audio cable with standard XLR-type connector. Please see the circuit diagram for wiring details. 2. The Power Unit N 12 VR This device not only supplies the microphone with the filament and plate voltage for the vacuum tube, but facilitates also the control of polar pattern and bass cut remotely from the micro phone. Prior to connecting the N 12 VR to AC power, check the AC voltage of the power line you are going to connect the N 12 VR to. Check that the N 12 VR AC voitage selector to the right of the power switch on the front panel is set to the same AC voltage. If it is not, use a flat-blade screwdriver to set the AC voltage selector to the correct voltage. Warning: Connecting the N 12 VR to the wrong AC voltage may destroy the unit and cause fire and/or electric shock. Replacing Fuses The fuse protecting the primary circuit is located in the marked fuse compartment below the power connector. Use a flat-blade screwdriver to open the fuse compartment lid. Replace the fuse with a new fuse of the same type (T 100 mA) and close the fuse compartment lid. The 50-mA, fast-blow fuse protecting the anode circuit is located on the circuit board inside the unit. Disconnect the unit from AC power by unplugging the power cable. Remove the four screws fastening the top panel. Remove the top panel. Replace the fuse with a new 50-mA, fast-blow fuse. Replace the top panel and fastening screws. Power Connector Especially on tour, you may need to connect the unit to a power outlet that does not match the power connector on the supplied power cable. Purchase a matching power cable locaily that complies with IEC and local safety standards and has a power connector with a chassis ground pin. While in the same area, use this „local“ power cable only. Should it be required to increase the connection between the microphone and the power unit beyound 20 metres, an adaption within the power unit N-Tube becomes necessary. According to the circuit diagram, a simple change of the fuse link marked 250 mA from its fuse holder to the one next to it marked > 20 m is all, which is required. 3. Specifications of the Microphone Operating Principle: Pressure gradient transducer with double-diaphragm and vacuum tube preamplifier Directional Characteristics: Omni-, cardioid-, figure-eight, and six intermediate positions remotely controlled from the microphone on the powering unit Sensitivity at 1000 Hz: 10mV/Pa . –40 dBV*) Frequency Range: 30 to 20,000 Hz ± 2.5 dB from published curve Electrical Impedance: 200 ohms ± 25 % Recommended Load Impedance: 1000 ohm...