Shure Sonodyne Models 51 and 51S
omnidirectional dynamic microphones

The Shure Model 51 Sonodyne omnidirectional dynamic microphone with switch adapter A83B

General: The Models 51 and 51S are rugged microphones built to provide good reproduction of music and voice. The microphones are pressure dynamic type and have omnidirectional pickup characteristics. The Models 51 and 51S are highly recommended for tape, wire, and disc recording, fixed or mobile public address paging systems, amateur communication and general communication service.

The microphones feature:

• High output and a response effective for announcing, narration, vocal music, and combo groups.
  
  
• A strong detachable cable, especially selected for good shielding from “hum” pickup.
  
  
• Very rugged mechanical design for reliable operation under severe conditions of use.
  
  
• A self-tensioning swivel which permits tilting so microphone can be aimed at source of sound.
  
  
• Built-in “On-Off” switch (Model 51S).

The Models 51 and 51S are multi impedance for connecting into microphone inputs rated at 25 to 50 ohms, 150 to 250 ohms, or into high impedance microphone inputs. The low impedances are recommended where long cable lengths are required or under conditions of severe hum disturbance. The permissible cable length is practically unlimited, since neither response nor level is appreciably affected. For use with high-impedance amplifiers, Shure Model A95A Line Matching Transformer is available for coupling the low impedance line to the amplifier input.

Quoted from Shure Brothers Inc. Data Sheet 27A173, © 1967

The Shure 51S omnidirectional dynamic mic.

Download the data sheet for this mic.