Page 1: ...h im pedance amplifier use a Shure Model A95A Line Match ing Transformer The Model 581SF has a low impedance of 25 ohms and is designed for installations where lower impedances are required The Model 58 ISA MP is a set of two matched Unidyne A Unidirectional Dynamic Microphones The units are matched within 1 0 db in level and within 1 5 db for frequency response For convenient connection to most t...
Page 2: ...chable I 5 foot 4 6 meter one conductor shielded cable with microphone connector Detachable 15 foot 4 6 meter one conductor shielded cable with microphone connector and a standard phone plug attached Detachable 18 foot 5 5 meter two conductor shielded cable with microphone connector attached Model A25B long life high quality swivel connector lined with a long life nylon sleeve for noise free and s...
Page 3: ...m inside microphone case Long nose pliers or tweezers may be used for this Remove the two 4 40 oval head machine screws located at both ends of the switch button Reach in with long nose pliers or tweezers and pull out the switch if a Model 581SB or 581SF or the switch transformer assembly if a Model 58 ISA Disconnect the leads from the old switch termi nals and remove old switch from the plastic t...
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