Shure Microphone 51 User Manual

OMNIDIRECTIONAL DYNAMIC MICROPHONES  
General: The Models 51 and 51S are rugged micro-  
phones 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 communica-  
tions and general communication service.  
The microphones feature:  
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High output and a response effective for an-  
nouncing, narration, vocal music, and combo  
groups.  
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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 microphone output shall be:  
L -- 25-50 ohm impedance ........... -51.0 db*  
M - 150-250 ohm impedance........ -51.0 db*  
H-- High.................................... -48.5 db**  
*0 db = 1 milliwatt per 10 microbars  
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 micro-  
phone 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 im-  
pedance amplifiers, Shure Model A95A Line Matching  
Transformer is available for coupling the low imped-  
ance line to the amplifier input.  
**0 db = 1 volt per microbar  
The Model 51S shall have a built-in “On-Off” switch.  
The Model 51 shall have no “On-Off” switch. The  
microphone rating Gm (sensitivity) at 1,000 Hz. Shall  
be within ± 3 db of the following levels:  
"L” Position of switch ................. -144.0 db  
“M” Position of switch................. -143.0 db  
“H” Position of switch ................. -145.0 db  
EIA Standard Rating SE-105 August 1949  
The microphone shall be provided with a swivel ad-  
justable from horizontal to 80° backward. It shall have  
a detachable cable connector capable of connecting  
to a two-conductor shielded cable. The microphone  
shall mount on a stand having 5/8"-27 thread. The  
overall dimensions shall be 4-17/32” (115.1 mm) high,  
3 1/8” (79.4 mm) wide, and 3%” (98.4 mm) deep.  
Impedance Selection  
Selection of the various impedances is accomplished  
by changing the position of the switch at the front of  
the microphone. The switch positions are marked "L"  
for low impedance (25-50 ohms), “M” for medium im-  
pedance (150-250 ohms), and “H” for high impedance  
(35,000 ohms).  
REPLACEMENT COMPONENTS  
Cable and Plug Assembly.........................Model C55  
Important: Shure Microphone Cables are selected after  
exhaustive tests to insure superior performance in  
microphones because of low capacities, superior  
shielding properties and unusually long life under  
severe use.  
Cables with plastic insulation should not be sub-  
jected to excessive soldering-iron heat. Carefully clean  
and tin the conductors and the connections to which  
the conductors are to be soldered. The soldering  
operation can then be done with a minimum of heat,  
thereby avoiding any possibility of damage to the  
cable.  
OPTIONAL ACCESSORIES  
Line Matching Transformer ..............................A95A  
Vibration-Isolation Stand..................................S39A  
Desk Stand ....................................................S36A  
Quick-Disconnect Isolation Unit ................ Model A47  
Guarantee: This Shure product is guaranteed in normal  
use to be free from electrical and mechanical defects  
for a period of one year from the date of purchase.  
Please retain proof of purchase date. This guarantee  
includes all parts and labor.  
Shipping Instructions: Carefully repack the unit and  
return it prepaid to the factory. If outside the United  
States, return the unit to your dealer or Authorized  
Shure Service Center for repair. The unit will be  
returned to you prepaid.  
ARCHITECT’S SPECIFICATlONS  
The microphone shall be the Shure Model 51S (51)  
or equivalent, A moving coil type microphone with a  
frequency range of 60 to 10,000 Hz. The microphone  
shall have an omnidirectional polar characteristic. The  
unit shall have a three-position impedance selection  
switch for selecting the microphone rating impedance  
f 25-50 ohms, 150-250 ohms, or 35,000 ohms.  
Copyright 1967, Shure Brothers Inc.  
27A173  
(OVER)  
Printed in U.S.A.  
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