OPERATING INSTRUCTIONS FOR NEUMANN
Contents
1. supply cover The sirapping boord is accessible after removal of the cover 7 Make also sure thot the proper volve fuse for the voltage used has been inserted in the fuse holder 300 ma for 110 volts 125 ma for 220 volts 8 The output signol from the microphone is fed to a three prong chassis mounted plug on the power supply unit The moling coble connector for this plug is supplied with each unit Connection to the microphone input of the console or recorder is accomplished by means of a two conductor shielded cable of ony desired length 9 The U 47 and U 48 microphones ore designed to work into a load impedance input impedance of console preamplifier of 230 respectively 1000 ohms or even higher To provide a sulficieniiy low source impedance from the microphones they have been designed for a source ipedance of the one fifth the load impedance For a 250 ohm lood impedance the source set for 200 ohms microphones is set for 50 ohms and for a 1000 ohm load impedance it i This prevents overloading of the preamplifier in the microphone itsel The microphones are usually supplied strapped for a 1000 chm load impedance but on request will be delivered for 250 ohms The 250 ohm adjusted microphones may be identified by a red dot located on the type number tag of the microphone 10 After interconnection of the microphone power supply and A C line the main switch may be ating condition will be indica2. OPERATING INSTRUCTIONS FOR NEUMANN CONDENSER MICROPHONES U 47 U 48 AND ACCESSORIES A May 1958 TECHNICAL DATA Microphones Useable Range of Frequencies 35 to 15 000 cps Directional Choracteristics U 47 irectional and car U48 bi directional and ca Source Impedance 200 or 50 ohms Sensitivity U47 opprox 2 5 mv dyne cm cardioid U48 approx 2 0 mvidyne em cardioid Total Harmonic Distortion less thon 0 8 ot 1000 cps up to a sound pressure level of 110 db Tube Complement 1 VF 14 M selected Power Supply NG Power Require 110 220 volts 50 60 cps Operating Vol 105 volts D C 40 ma the heater voltage is token from the 105 volt supply Fuse 0 3 0 125 amp Pilot Lamp 110 volts neon interconnecting Cable UC 4 Standard Length 33 ft other lengths on request Stand Mount Wa right hand thread 4 27 thread on request GENERAL The U 47 and U 48 microphones ore identical directional every way with the exception of the characteristics U 47 non directional and cordioid U 48 bi direclional and cardioid which can easily be selected by means of a slide switch located ot the bose of the wire mesh port of the microphones The newer type U 48 is designed in such a way that the plug in head of the U 47 may be inserted in place of the U 48 head thus making possible oll three patterns with the some basic unit wi as it is impossible to use the U 48 head in place of Ihe U 47 hes PLACING IN OPERATION 1 The U 47
3. and U 48 microphones are equipped with special pin plugs in their base the No 5 pin corrying the D C supply voltage to the microphone being purposely shortened to make provision that the ground pin connects before the plate voltoge As a lurther pre coution always make sure thot the power supply is switched off when plugging the microphone into the mating receptacle on the UC 3 extension cable or the UC 4 inlerconnecting cable with microphone sland mount to avoid possible shock to the operator 2 The UC4 stond mount incorporating a swivel joint comes normally equipped with a 14 riabt hand thread in the case of U S A use with 27 thread for the purpose of mounting ihe microphones on slands ond booms 3 The four conductor shielded cable comes normally 33 ft long but lengths up to 300 feet ore admissible between microphone ond power supply ond con be supplied on order 4 The NG power supply delivers the required single voltage of 105 volts D C at 40 ma lo the microphone The required heater vollage is token from this single voltage 5 The power supply is equipped with a two pole plug to which the power cord has to be connected A mating A C connector for this plug is supplied with the power supply on special request 6 First make certain thot the power supply is properly strapped for the A C line voltage 110 or 220 volis required The correct selling of this sirap is visible through o small window ot one side of the power
4. ch incidentally is especially selected for low noise ot our factory and should only be obtained through Us or our representatives is of the plug in type and can therefore be quickly replaced 5 The amplifier characteristics can be measured by means of the test copsule Z 9 Instructions for test procedure are furnished with the Z9 test capsule A voltage of 100 mv ot the test capsule Z 9 is equivalent to a sound pressure of 70 ubar 110 phon al the microphone copsule For microphones adjusted to a source impedonce of 200 ohms the goin of the omplifier amounts to approximately 3 db 4 Without connection of microphone the voltage at the power supply unit is approximately volts 7 Should the diaphragm have become dusty after a long period of service it may be cleaned by means of an extremely soft camel hair brush For that purpose the capsule itself is accessible after removal of the three outer fastening screws located al the bottom of its mounting plate 8 Caution Never remove the four fastening screws located in the middle of the capsule mounting plote i 9 Revstrapping from one impedance to the other con microphone housing by following the diagram and pictorial attached 10 When ordering spare parts it is recommended that you include the serial number so thot the proper parts for your particular model can be supplied i E RECOMMENDATIONS 1 U47 and U48 microphones con be susnended from film ond television booms by means of
5. special full elastic suspensions type Z 37 which help reduce mechanical shock interference Carried through the floor and which permit rapid turning at the end of the boom 2 Where U47 or U 48 microphones ore permanently installed in studios or other locations we recommend the installation of microphone outlets T3040 into which the microphone inter connecting cable con be plugged Concealed lines should lead from these woll sockets to the equipment rack or console where iype NGK plug in power supply may be installed in a svitoble plug in frame 3 Where two or more type U 47 or U 48 microphones ore used in the some locotion we recom mend the use of double power supply NG 2 Two U 47 or U 48 microphones or one of each can be operated from this unit whose dimensions are identical to those of the single tyne NG power supply simply performed after removal of the presentation of the terminal boord
6. ted by a neon lamp It isnot harmful to the s operated even for longer periods of time without connection of a microphone 11 The worm up time of the U 47 and U 48 microphones is somewhat over one minute This is due to the 55 volt heater voltage which is tapped off the 105 volt supply volta D TESTING AND MAINTENANCE NEUMANN microphones are mode with extreme core and occuracy and careful handling is required if consistently excellent results are expected Warning The plug in head as well as the amplifier part of the micro phones are sealed at the factory ond we recommend that these seals not be broken otherwise the guarantee will be void Should the microphones need servicing it is recommended that they be repaired at our factory or at our authorized service centers The following instructions are given on the explicit understanding that all such operations performed On NEUMANN microphones are undertaken at your own risk 1 Work performed on the microphones should be approached with extreme core and dry hands Such repair should only be attempted by a skilled technician 2 Under no circumstances should one blow into the microphone capsule itself and the diaphragm should remain untouched 3 The microphone head can be removed after unscrewing the three fastening screws and the protecting cover of the amplifier con be taken off after removal of the screw at the microphone jase 4 The omplifier tube VF 14M whi
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