Страница 1: ...Western Electric 1VIICROPHQNE No 618A Moving Coil Type and Associated Apparatus INSTRUCTIONS FOR USE insttucu n BuQat n No ri 4m...
Страница 2: ...s outer edge To this diaphragm is attached a coil of aluminum ribbon Motion of the diaphragm causes the coil to move in the magnetic field in which it is located The magnetic field is maintained by a...
Страница 3: ...person speaking with normal conversational intensity at a distance of 3 feet from the micro phone an output level of 84 db relative to a zero level of 6 milliwatts is representative A speaker need not...
Страница 4: ...associated apparatus are of the compression type They are connected and held in firm contact by pressure applied by means of a cam lever located on the side of the plug Figure 5 outlines the various u...
Страница 5: ...a No 406A 3 Jack on the other end This cord is shown in Figure 6 The No M3K Cord is a brown cotton covered cord and is intended for use with the Nos 18A and 19A Mountings Its standard lengths are 12...
Страница 6: ...e Microphone OPERATION The microphone may be placed in any of the mountings by loosening the knurled clamping ring nut sufficiently to allow the microphone to be readily inserted The nut should then b...
Страница 7: ...ide contacts The case of the microphone is also connected to the middle contact of the jack The heads of the Nos 18 and 19 Type Mountings are interchangeable so that a microphone may be transferred fr...
Страница 8: ...ed to the contact nearest the cam lever of the plug or the strike plate of the jack the shield conductor to the middle contact and the green conductor to the third contact After the con ductors have b...
Страница 9: ...onal Standard Electric Corp Caixa Postal 430 Street Address Rua Vlsconde de In hauma 64 Rio de Janeiro CHINA China Electric Co Ltd 230 Med hurst Road P 0 Box 289 Shanghai CZECHOSLOVAKIA Standard Elect...
